Dr.-Ing. Georg Hasemann
Dr.-Ing. Georg Hasemann
Werkstofftechnik
Current projects
DiveDeEP: Identification of microstructure-property relationships of dispersion-reinforced high-performance materials
Duration: 01.05.2024 bis 30.04.2027
The aim of the project is to develop and qualify dispersoid-reinforced high-temperature resistant alloys for use as potential structural materials in the aerospace industry. Increased efficiency through increased operating temperatures and reduced weight lead to improved efficiency of turbines.
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FlexiDS 2.0: Directed growth behavior of novel eutectic V-Si-B alloys - characterization and properties for high temperature applications
Duration: 01.12.2023 bis 30.11.2026
V-Si-B alloys have been the focus of scientific material development for several years. Due to their outstanding specific mechanical properties, these alloys represent a promising alternative to Ni and Mo-based materials in the field of high-temperature alloys. In terms of its microstructure, the V-Si-B alloy system has some interesting similarities with the well-studied Mo-Si-B sister system. Both alloy systems form a ternary eutectic in the metal-rich region (e.g. vanadium) from a solid solution, V(Mk), and the two intermetallic phases V3Si and V5SiB2. Directional solidification allows the eutectic to be "grown" along the direction of solidification, which results in a strong directional dependence of the resulting mechanical properties (strength, creep resistance). Similar to Ni-based superalloys, these could be specifically adjusted for an application-relevant load case. The proposed project investigates the microstructure formation and the resulting properties (direction-dependent strength and creep properties) of directionally solidified, novel eutectic V-Si-B alloys. For this purpose, the zone melting process will be investigated and analyzed both ex-situ and the direct transition from the liquid to the solid phase at the moment of directional solidification in-situ.
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Alloy design for improved materials properties
Duration: 01.07.2023 bis 30.06.2026
Metallic materials for applications as structural materials, e.g. in corrosive environments at different temperatures, must have a wide range of properties. By adding alloying elements, the properties can be influenced over a wide range. For example, the strength of molybdenum materials can be significantly increased by adding even small amounts of silicon. Other properties, such as tribological abrasion, the oxidation or corrosion rate and cyclic strength, are also heavily dependent on the selection, concentration and combination of alloying elements. In addition, the heat treatment condition of the alloys plays a major role in adjusting the range of properties to suit the application. For materials in the medical sector, e.g. implant materials, properties under varying stress conditions (cyclic loading) also play a decisive role. The aim of this project is to modify materials in such a way that hardness and wear resistance are increased and static and cyclic stress resistance is improved without reducing oxidation and corrosion resistance. The microstructure-property relationships are specifically influenced in order to create optimum conditions for the subsequent application.
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Development and characterization of eutectic V-Si-B alloys with improved specific mechanical properties: role of the new V8SiB4 phase
Duration: 01.04.2024 bis 31.03.2026
Vanadium silicide materials represent a potential alternative to currently used high-temperature materials, in particular due to their excellent specific mechanical properties. For example, V-Si-B alloys from the vanadium-rich region of the three-material system consist of a ductile vanadium solid solution (V-Mk) and the two intermetallic phases V3Si and V5SiB2. However, this alloy system, which has been little researched to date, has some surprising similarities to its well-studied neighboring system Mo-Si-B in terms of microstructure. In initial preliminary tests on V-Si-B alloys, significantly better specific compressive strengths were achieved in the temperature range from 600 °C to 900 °C compared to Ni-based alloys. However, the mechanism of phase formation and the correlation of the microstructure-property relationships are still completely unexplored. The primary objective of this project is the development of novel V-Si-B alloys for high temperature applications. The aim is to develop ternary-eutectic alloys. In a series of V-rich binary and ternary test alloys, the phase formation and stability from the melt to the homogenized microstructure will be investigated. In the 2nd funding phase, research will focus on the significance of the newly discovered phase V8SiB4.
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Development of eutectic refractory metal alloys for applications under extreme conditions
Duration: 01.10.2022 bis 30.09.2025
The focus of the project is to gain a comprehensive understanding of refractory metal-based RM-Si-B systems. This includes phase formation and transformation during solidification, as well as phase stability and transformations in the equilibrium state. Research is being carried out specifically into ternary eutectics in the metal-rich part of the RM-Si-B system. For this purpose, the chemical compositions of the phases involved are identified by means of thermodynamic calculations and validated experimentally (e.g. by means of WDX or microprobe measurements). Ternary eutectics are considered advantageous with regard to their lowest melting point for the alloy range and the special mechanical properties associated with the microstructure. Furthermore, the eutectic microstructure can be easily controlled via the (process-dependent) cooling conditions and thus have a targeted influence on the mechanical properties of such alloys. This can be achieved, for example, by directional solidification of such RM-based eutectic systems. The aim is to develop RM-Si-B alloys with improved specific strength properties at temperatures between 600 °C and 1500 °C (possible application window for eutectic RM-Si-B systems) compared to Ni-based alloys. The scientific work focuses in particular on Mo- and V-based alloy systems.
Similar to Mo-Si-B materials, a technical application of, for example, vanadium silicide alloys with around 30 to 70% V(MK) phase and complementary silicide phases is the most promising and likely. A precise understanding of the microstructure-property relationships in combination with the thermodynamics of RM-rich RM-Si-B systems is therefore essential and a holistic approach to material development is being pursued. This includes alloy selection and material synthesis (electric arc furnace, directional solidification, heat treatments), characterization of microstructural evolution and mechanical properties (temperature-dependent compression and creep tests), and the development of effective oxidation mechanisms (via preceramic polymers and pack cementation) for the RM-Si-V alloy systems.
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Refractory metal-based alloys with integrated coatings for aerospace applications
Duration: 01.06.2022 bis 31.08.2025
The efficiency of gas and aircraft turbines could be increased considerably by a slightly higher gas inlet temperature, which would result in a significant improvement in the environmental balance and use of resources. The nickel-based superalloys currently in use are very limited in this context due to their comparatively low melting temperature, which is why hardly any improvements can be achieved with this class of materials. The most promising candidates for replacing nickel-based superalloys are the refractory metal-based Mo-Si-B alloys that have been under discussion for some time and whose range of properties is most balanced both at room temperature and at higher temperatures. In addition, earlier studies have shown that the addition of vanadium within these high-temperature alloys leads to a significant reduction in density, which would predestine them for possible use in aerospace technology.
The biggest challenge for these alloys is still their oxidation resistance, which needs to be improved in this respect. In particular, the range between 600 °C and 800 °C must be regarded as extremely critical, as this is where so-called "pesting", a catastrophic oxidation failure, occurs. From a temperature of 1000 °C, however, a protective borosilicate layer begins to form on the surface after a certain time, which protects the material from further oxidation.
The main focus of this project is the development and optimization of Mo-40V-9Si-8B materials, which are additionally provided with a coating [MoSi2/RHEA Mo-Ta-Ti- (Cr, Al)] in order to meet the requirements of the aerospace industry in terms of mechanical properties and oxidation resistance. To this end, a suitable alloying strategy must first be developed for both the substrate and the coating material. Subsequently, a corresponding powder metallurgical production route is to be established via mechanical alloying. The base material is to be produced via a corresponding sintering process, while the oxidation protection layer is to be applied by means of high-performance cathode sputtering or pack cementing. In the final step, various tests (microstructure analysis, mechanical properties, oxidation resistance, etc.) will be carried out on both the uncoated and coated material in order to test the applicability of the developed material system as a structural material.
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Initiation of international collaboration on the crystal structure, microstructure and mechanical properties of precipitation hardened Fe-Cu-Ni-Ti-Al complex concentrated alloys
Duration: 01.07.2024 bis 30.06.2025
Since the CCAs are being actively explored for next-generation structural materials for high-temperature applications and therefore, they should have a high creep resistance besides that a comprehensive understanding of their creep and fracture behaviors is also indispensable.
Among the several anomalies existing in the creep behavior of HEAs, the foremost important is the stress exponent, n, calculated from the Berkovich nanoindentation creep tests turns out to be much larger than that calculated based on the uniaxial stress relaxation and spherical nanoindentation creep tests, and this could not be explained using classical creep theory for crystalline metals. It is still uncertain whether the classical creep theory for conventional metals are applicable for the HEAs.
The Fe32.3Al29.3Cu11.7Ni10.8Ti15.9 CCA, developed by OVGU-HT Materials group – whose compression behavior was studied under a constant displacement test with quasi static strain rate between room temperature (RT) and 1100°C revealed a stable single phase bcc microstructure with precipitates at the grain boundaries. The high temperature deformation and creep behavior of this material will be studied during a 3 months visit of Prof. Puspendu Sahu, Professor of Physics), Jadavpur University, Kolkata, India. In addition, TEM analyses are planned to perform at Jadavpur University with the deformed materials to get insights into the deformation mechanisms.
Completed projects
Participation in the International Joint Graduate Program in Materials Science (GP-MS) at Tohoku University, Japan
Duration: 01.10.2019 bis 31.12.2024
The International Graduate Program at Tohoku University in Sendai, Japan, was opened in 2018 with the participation of numerous colleagues from Asia, Europe and the USA. Prof. Manja Krüger and Dr. Georg Hasemann from Otto von Guericke University Magdeburg are involved in the program (see photo). Together with our Japanese colleagues Prof. Kyosuke Yoshimi and Ass. Prof. Shuntaro Ida and use the unique equipment in the laboratories of Tohoku University in Sendai and Otto von Guericke University Magdeburg.
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Determination of phase equilibria of V-Si-B-Cr alloys at high temperatures
Duration: 01.10.2019 bis 30.09.2022
In cooperation with Prof. K. Yoshimi from Tohoku University in Sendai, Japan, vanadium-based high-temperature materials are being produced and investigated. The materials are selected on the basis of thermodynamic phase equilibria. They are produced using a melting metallurgical process with subsequent heat treatment. Results are discussed and alloy development is further optimized during reciprocal visits.
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Development and characterization of eutectic V-Si-B alloys with improved specific mechanical properties for high temperature applications
Duration: 01.04.2019 bis 31.03.2022
Nickel-based superalloys are currently the material class of choice for high-temperature applications in turbine construction. Vanadium silicide materials represent a potential alternative, particularly due to their excellent specific mechanical properties. For example, V-Si-B alloys from the vanadium-rich region of the three-material system consist of a ductile vanadium solid solution (V-Mk) and the two intermetallic phases V3Si and V5SiB2. However, this alloy system, which has been little researched to date, has some surprising similarities to its well-studied neighboring system Mo-Si-B in terms of microstructure. In initial preliminary tests on V-Si-B alloys, significantly better specific compressive strengths were achieved in the temperature range from 600 °C to 900 °C compared to Ni-based alloys. However, the mechanism of phase formation and the correlation of the microstructure-property relationships are still completely unexplored. The primary objective of this project is the development of novel V-Si-B alloys for high temperature applications. The aim is to develop ternary eutectic alloys. In a series of V-rich binary and ternary test alloys, the phase formation and stability from the melt to the homogenized microstructure will be investigated.
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Oxidation protection of vanadium alloys by pack cementation
Duration: 01.01.2020 bis 30.06.2021
Due to their excellent mechanical properties, vanadium alloys have the potential to be used as future structural materials. However, vanadium materials oxidize strongly at elevated temperatures, which means that their range of application is currently limited to typical ambient temperatures.
In the DFG-funded cooperation project "Oxidation protection coatings for vanadium materials" (project number 39807701, duration until 02/2019), suitable oxidation protection coatings were developed. These were applied in the laboratory of Prof. J. Perepezko (University of Wisconsin-Madison, USA) using the special powder packaging process. At the IWF, these layer-substrate composites are examined in detail using various microscopic methods and their protective effect is tested.
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FlexiDS: Elucidation of phase and microstructure formation during directional solidification of new metallic and intermetallic materials by in-situ observation of the solidification process with photon diffraction
Duration: 01.08.2016 bis 31.07.2019
In cooperation with the Karlsruhe Institute of Technology (KIT), the FlexiDS project aims to investigate the process of directional solidification in various high-temperature materials using in-situ X-ray diffraction. Within this framework, an innovative in-situ sample environment for directional solidification is to be developed and set up at the HEMS (High Energy Material Science) beamline at DESY (Deutsches Elektronen Synchrotron, Hamburg) . This will offer the partners involved completely new research and characterization possibilities through direct observation of the directional solidification process. The Helmholtz-Zentrum-Geesthacht (HZG), which is in charge of this beamline, will support the design, construction and operation of the sample environment.
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Solidification behavior of near-eutectic and eutectic Mo-Si-B alloys
Duration: 01.06.2015 bis 31.12.2016
Molybdenum-silicon-boron alloys are regarded as attractive high-temperature materials with properties that go beyond those of conventional nickel-based superalloys. Eutectic Mo-Si-B alloys are particularly interesting for processes such as directional solidification by zone melting or selective laser melting because they are suitable for producing fiber-matrix structures.
To determine the eutectic point in the three-phase region Mo-Mo3Si-Mo5SiB2, the cooling paths of different alloys are investigated and compared with thermodynamic simulations. The microstructural characteristics of these materials are correlated with the mechanical properties up to 1400°C.
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High Temperature Materials with Intermetallic Structures
Duration: 01.12.2013 bis 30.11.2015
The project relates to the application of an energy-efficient method for the production of novel refractory metal alloys with melting temperatures above 2000°C. These materials have the potential to substitute the currently used nickel-based superalloys with maximum application temperatures of around 1100°C. With the help of such a material substitution, a contribution can be made to increasing thermodynamic efficiency, for example in power generation units.
In our approach, alloys with intermetallic structures are produced directly from a mixture of elemental powders in just one process step, whereby the size and distribution of the microstructure components are specifically influenced by the production parameters. The Ukrainian partner is providing a zone melting furnace specially designed for such high-melting-point materials. The expertise of the German partner will be used to characterize the relationships between the microstructure and the properties of the new materials. The new materials and the unique production technology can be used in the energy supply sector, the aircraft industry and other areas where extreme conditions are required in terms of thermal and mechanical stress.
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COMO II - Joint project in the automotive research focus area - Friction reduction - Materials sub-project
Duration: 01.01.2012 bis 31.12.2013
The materials sub-project will contribute to the characterization of the microstructure and properties of structured and coated cylinder running surfaces with regard to the reduction of friction losses.
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2025
Peer-reviewed journal article
Phase equilibria in the V-rich region of the V-Si-B system at 1400 °C
Yang, Weiguang; Hasemann, Georg; Saldaña, Mustafa Carrion; Gorr, Bronislava; Schwaiger, Ruth; Krüger, Manja
In: Journal of phase equilibria and diffusion - Boston, Mass. : Springer . - 2025, insges. 19 S. [Online first]
2024
Peer-reviewed journal article
Improvement of the strength of ternary eutectic V-Si-B alloys at ambient and high temperatures due to Cr additions
Hasemann, Georg; Thielemann, Lars; Yang, W.; Ida, S.; Schwaiger, R.; Yoshimi, K.; Krüger, Manja
In: Journal of alloys and compounds - Lausanne : Elsevier, Bd. 1005 (2024), Artikel 176041, insges. 8 S.
Orientation-dependent hardness of Mo3Si studied by cube-corner nanoindentation
Yang, Weiguang; Hasemann, Georg; Schwaiger, Ruth; Krüger, Manja
In: Journal of materials science - Dordrecht [u.a.] : Springer Science + Business Media B.V, Bd. 59 (2024), S. 277-288
Thermodynamic properties of refractory Mo-Nb-V-Ti high entropy alloys (HEAs)
Bencze, László; Hasemann, Georg; Sergeev, Dmitry; Motalov, Vladimir; Müller, Michael; Krüger, Manja
In: Journal of alloys and compounds - Lausanne : Elsevier, Bd. 976 (2023), Artikel 173279, insges. 12 S.
2023
Peer-reviewed journal article
Efficient sintering of Mo matrix composites - a study of temperature dependences and the use of the sinter additive Ni
Solodkyi, Ievgen; Petrusha, Vadym; Grigoroscuta, Mihai Alexandru; Schmelzer, Janett; Hasemann, Georg; Betke, Ulf; Badica, Petre; Krüger, Manja
In: Metals - Basel : MDPI, Bd. 13 (2023), Heft 10, Artikel 1715, insges. 15 S.
2022
Peer-reviewed journal article
Microstructure formation of cast and directionally solidified Mo-Ti-B alloys
Petrusha, Vadym; Hasemann, Georg; Touzani, Rachid Stefan; Bolbut, Volodymyr; Bogomol, Iurii; Krüger, Manja
In: Metals - Basel : MDPI, Bd. 12 (2022), Heft 6, Artikel 916, insges. 13 S.
V 8SiB 4 - a new ternary phase in the V-Si-B system
Yang, W. G.; Touzani, Rachid Stefan; Hasemann, Georg; Yazlak, M.; Ziegner, M.; Gorr, B.; Schwaiger, R.; Krüger, Manja
In: Intermetallics - Amsterdam [u.a.] : Elsevier Science, Bd. 151 (2022), Artikel 107691, insges. 12 S.
Thermodynamic modelling of the V-Ti-B system
Yazlak, Mustafa; Christ, H.-J.; Yang, W.; Krüger, Manja; Hasemann, Georg; Gorr, B.
In: Calphad - Amsterdam [u.a.] : Elsevier Science, Bd. 79 (2022), Artikel 102477 [Online first]
Refractory metal-based high entropy silicide-borides - the future of materials beyond MoSiB?
Galetz, M. C.; Ulrich, A. S.; Hasemann, Georg; Krüger, Manja
In: Intermetallics - Amsterdam [u.a.] : Elsevier Science, Bd. 148 (2022), Artikel 107620, insges. 1 S.
Ternary Vss-V3Si-V5SiB2 eutectic formation in the V-Si-B system
Yang, W. G.; Hasemann, Georg; Yazlak, M.; Gorr, B.; Schwaiger, Ruth; Krüger, Manja
In: Journal of alloys and compounds - Lausanne : Elsevier, Bd. 902 (2022), Artikel 163722 [Online first]
2021
Abstract
A novel alloy development approach - biomedical high-entropy alloys
Regenberg, Maximilian; Schmelzer, Janett; Hasemann, Georg; Krüger, Manja
In: Intermetallics 2021 - International Conference, 04-08 October 2021 : Educational Center Kloster Banz, Germany : programme and abstracts , 2021 - Jena, Germany : Conventus Congressmanagement & Marketing GmbH ; Krüger, Manja, S. 109-110, Artikel O-HEA-04 [Intermetallics 2021, International Conference, 4th till 8th October 2021 : Educational Center Kloster Banz, Germany]
Biocompatibility of pure refractory metals and their combination as high entropy alloys
Schmelzer, Janett; Hasemann, Georg; Regenberg, Maximilian; Betke, Ulf; Krüger, Manja; Walles, Heike; Scheffler, Michael
In: Intermetallics 2021 - International Conference, 04-08 October 2021 : Educational Center Kloster Banz, Germany : programme and abstracts , 2021 - Jena, Germany : Conventus Congressmanagement & Marketing GmbH ; Krüger, Manja, S. 172-173, Artikel P-13 [Intermetallics 2021, International Conference, 4th till 8th October 2021 : Educational Center Kloster Banz, Germany]
High-energy synchrotron X-ray in situ observation of ternary eutectic growth in a directionally solidified Mo-Si-B alloy
Hasemann, Georg; Zhu, Linye; Hauschildt, Katja; Blankenburg, Malte; Ida, Shuntaro; Pyczak, Florian; Yoshimi, Kyosuke; Krüger, Manja
In: Intermetallics 2021 - International Conference, 04-08 October 2021 : Educational Center Kloster Banz, Germany : programme and abstracts , 2021 - Jena, Germany : Conventus Congressmanagement & Marketing GmbH ; Krüger, Manja, S. 55-56, Artikel O-SI-02 [Konferenz: Intermetallics 2021, International Conference, 4th till 8th October 2021 : Educational Center Kloster Banz, Germany]
Ternary Vss-V3Si-V5SiB2 eutectic reaction in V-SiB system
Yang, Weiguang; Hasemann, Georg; Yazlak, Mustafa; Gorr, Bronislava; Schwaiger, Ruth; Krüger, Manja
In: Intermetallics 2021 - International Conference, 04-08 October 2021 : Educational Center Kloster Banz, Germany : programme and abstracts , 2021 - Jena, Germany : Conventus Congressmanagement & Marketing GmbH ; Krüger, Manja, S. 165-166, Artikel P-08 [Intermetallics 2021, International Conference, 4th till 8th October 2021 : Educational Center Kloster Banz, Germany]
Peer-reviewed journal article
Microstructural characterization of arc-melted and directionally solidified near-eutectic molybdenum-silicon-boron alloys
Zhu, Linye; Ida, Shuntaro; Hasemann, Georg; Krüger, Manja; Yoshimi, Kyosuke
In: Intermetallics - Amsterdam [u.a.] : Elsevier Science - 132 (2021), Artikel 107131, insgesamt 9 Seiten
A novel alloy development approach - biomedical equiatomic Ta-Nb-Ti alloy
Regenberg, Maximilian; Schmelzer, Janett; Hasemann, Georg; Bertrand, Jessica; Krüger, Manja
In: Metals - Basel : MDPI, Bd. 11 (2021), Heft 11, Artikel 1778, insges. 12 S.
Refractory metal coated alumina foams as support material for stem cell and fibroblasts cultivation
Hasemann, Georg; Betke, Ulf; Krüger, Manja; Walles, Heike; Scheffler, Michael
In: Materials - Basel : MDPI, Bd. 14 (2021), Heft 11, Artikel 2813
In situ observation of ternary eutectic growth in a directionally solidified MoSiB alloy using highenergy synchrotron Xrays
Hasemann, Georg; Zhu, Linye; Hauschildt, Katja; Blankenburg, Malte; Ida, Schuntaro; Pyczak, Florian; Yoshimi, Kyosuke; Krüger, Manja
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 23 (2021), Heft 11, Artikel 2100111, insges. 9 S.
Microstructure evolution and sequence of phase transition reactions through the solidification of Mo-Si-B alloy - a phase-field study
Kazemi, Omid; Hasemann, Georg; Krüger, Manja; Halle, Thorsten
In: Computational materials science - Amsterdam [u.a.] : Elsevier Science, Bd. 193 (2021), S. 1-7, Artikel 110422
2020
Book chapter
Structural analysis of gas turbine blades made of Mo-Si-B under stationary thermo-mechanical loads
Kauss, Olha; Naumenko, Konstantin; Hasemann, Georg; Krüger, Manja
In: Advances in mechanics of high-temperature materials - Cham : Springer . - 2020, S. 79-91 - (Advanced structured materials; 117)
Peer-reviewed journal article
Preceramic polymer-derived ceramic foams with lamellar strut porosity
Dammler, Kathleen; Schelm, Katja; Kniep, D.; Hasemann, Georg; Scheffler, Michael
In: IOP conference series / Materials science and engineering / Institute of Physics - London [u.a.] : Institute of Physics - Vol. 882 (2020), Paper 012005, insgesamt 12 Seiten [Symposium: Symposium on Materials and Joining Technology, Magdeburg, Germany, 7-8 September 2020]
Microstructure-property relations of eutectic V-Si and V-B alloys
Regenberg, Maximilian; Hasemann, Georg; Müller, Christopher; Krüger, Manja
In: IOP conference series / Institute of Physics - London [u.a.] : Institute of Physics - Vol. 882 (2020), Paper 012014, insgesamt 12 Seiten [ Symposium: Symposium on Materials and Joining Technology, Magdeburg, Germany, 7-8 September 2020]
A zone melting device for the in situ observation of directional solidification using high-energy synchrotron x rays
Gombola, C.; Hasemann, Georg; Kauffmann, A.; Sprenger, I.; Laube, S.; Schmitt, A.; Gang, F.; Bolbut, Volodymyr; Oehring, M.; Blankenburg, M.; Schell, N.; Staron, P.; Pyczak, F.; Krüger, Manja; Heilmaier, M.
In: Review of scientific instruments - [S.l.] : American Institute of Physics - Volume 91 (2020), issue 9, article 093901, 10 Seiten
Microstructure evolution and mechanical properties of refractory Mo-Nb-V-W-Ti high-entropy alloys
Regenberg, Maximilian; Hasemann, Georg; Wilke, Markus; Halle, Thorsten; Krüger, Manja
In: Metals - Basel : MDPI - Vol. 10 (2020), 11, Article 1530, insgesamt 13 Seiten
Coating reactions on vanadium and V-Si-B Alloys during powder pack-cementation
Hasemann, Georg; Harris, Chad; Krüger, Manja; Perepezko, John H.
In: Materials - Basel : MDPI - Volume 13 (2020), issue 18, article 4099, 7 Seiten
Experimental study of the liquidus surface in the V-rich portion of the V-Si-B system
Hasemann, Georg
In: Journal of alloys and compounds - Lausanne : Elsevier - Volume 824 (2020), Artikel 153843
Microstructure and compression properties of VSSV3B2 eutectic alloys in the V-Si-B system
Müller, Christopher; Hasemann, Georg; Regenberg, Maximilian; Betke, Ulf; Krüger, Manja
In: Materials - Basel : MDPI - Volume 13 (2020), issue 9, article 2100, 12 Seiten
Manufacturing of open-cell metal foams by the sponge replication technique
Sutygina, Alina; Betke, Ulf; Hasemann, Georg; Scheffler, Michael
In: IOP conference series / Institute of Physics - London [u.a.] : Institute of Physics - Vol. 882 (2020), Paper 012022, insgesamt 11 Seiten [Symposium: Symposium on Materials and Joining Technology, Magdeburg, Germany, 7-8 September 2020]
Oxidation response of additively manufactured eutectic Mo-Si-B alloys
Becker, Julia; Fichtner, D.; Schmigalla, S.; Schultze, S.; Heinze, C.; Küsters, Y.; Hasemann, Georg; Schmelzer, Janett; Krüger, Manja
In: IOP conference series / Institute of Physics - London [u.a.] : Institute of Physics - Vol. 882 (2020), Paper 012002, insgesamt 9 Seiten [Symposium: Symposium on Materials and Joining Technology, Magdeburg, Germany, 7-8 September 2020]
2019
Abstract
Microstructure-property relationship of vanadium solid solutions, two-phase and three-phase alloys
Müller, Christopher; Hasemann, Georg; Krüger, Manja
In: 2018 MRS Fall meeting & exhibit - Materials Research Society - 2018, ID PM06.04.07 [Konferenz: 2018 MRS Fall Meeting & Exhibit, Boston, Massachusetts, November 25-30, 2018]
Alloying effects in vanadium solid solutions
Müller, Christopher; Hasemann, Georg; Krüger, Manja
In: Beyond Nickel-Based Superalloys III - Kyoto University . - 2019 [Konferenz: 3rd International Conference on Beyond Nickel-Based Superalloys, Nara, Japan, Jun 11-14, 2019]
Alloying effects in vanadium solid solutions
Müller, Christopher; Hasemann, Georg; Krüger, Manja
In: Intermetallics 2019 - Jena, Germany : Conventus Congressmanagement & Marketing GmbH ; Heilmaier, Martin - 2019, Poster-ID: p-28, Seite 214
Peer-reviewed journal article
Processing of Mo silicide powders as filler particles in polymer-derived ceramic coatings for Mo-Si-B substrates
Krüger, Manja; Schmelzer, Janett; Smokovych, Irina; Lopez Barillao, Jennifer; Hasemann, Georg
In: Powder technology - Amsterdam [u.a.] : Elsevier Science, Bd. 352 (2019), S. 381-385
Room temperature plastic deformability in V-rich VSiB alloys
Hasemann, Georg; Müller, Christopher; Grüner, D.; Wessel, E.; Krüger, Manja
In: Acta materialia - Amsterdam [u.a.] : Elsevier Science, Bd. 175 (2019), S. 140-147
Experimental assessment of the microstructure evolution and liquidus projection in the Mo-rich Mo-Si-B system
Hasemann, Georg; Ida, S.; Zhu, L.; Iizawa, T.; Yoshimi, K.; Krüger, Manja
In: Materials and design - Amsterdam [u.a.] : Elsevier Science - Vol. 185 (2020), Artikel 108233, insgesamt 13 Seiten
2018
Peer-reviewed journal article
Microstructures of ternary eutectic refractory Me-Si-B (Me = Mo, V) alloy systems
Hasemann, Georg; Krüger, Manja; Palm, Martin; Stein, Frank
In: Materials science forum - Uetikon : Trans Tech Publ., Bd. 941 (2018), S. 827-832
Vacancy effects on the mechanical behavior of B2-FeAl intermetallics
Zamanzade, M.; Hasemann, Georg; Motz, C.; Krüger, Manja; Barnoush, A.
In: Materials science and engineering / A - Amsterdam : Elsevier, Bd. 712 (2018), S. 88-96
Prediction of thermodynamic properties of Mo-Si-B alloys from first-principles calculations
Hütter, Sebastian; Hasemann, Georg; Al-Karawi, J.; Krüger, Manja; Halle, Thorsten
In: Metallurgical and materials transactions / A - Boston : Springer, Bd. 49 (2018), Heft 12, S. 6075-6083
2017
Abstract
Alloy design and microstructure of refractory Mo-V-Nb-W-Tix HEAs
Hasemann, Georg; Wilke, Markus; Halle, Thorsten; Krüger, Manja
In: Intermetallics 2017 - Bad Staffelstein : Educational Center Kloster Banz, S. 97-98 [Konferenz: Intermetallics 2017]
Book chapter
Entwicklung von High-Entropy-Legierung auf Refraktärmetallbasis
Hellriegel, M.; Wilke, Markus; Hasemann, G.; Halle, Thorsten
In: 16. Sommerkurs Werkstoffe und Fügen - Magdeburg, 08. und 09. September 2017 , 2017 , korrigierte Auflage - Magdeburg : Universitätsbibliothek, S. 113-118
Peer-reviewed journal article
Polymer derived oxidation barrier coatings for Mo-Si-B alloys
Smokovych, Iryna; Hasemann, Georg; Krüger, Manja; Scheffler, Michael
In: Journal of the European Ceramic Society - Amsterdam [u.a.] : Elsevier Science, Bd. 37 (2017), Heft 15, S. 4559-4565
Prediction of phase distribution pattern in phase field simulations on Mo 5SiB 2-primary areas in near eutectic Mo-Si-B alloy
Kazemi, 0.; Hasemann, G.; Krüger, Manja; Halle, Thorsten
In: IOP conference series / Materials science and engineering - London [u.a.] : Institute of Physics - Vol. 181.2017, Art. 012033, insgesamt 7 S. [Kongress: 19th Chemnitz Seminar on Materials Engineering,16./17. March 2017, Chemnitz, Germany]
Dissertation
Microstructure and properties of near-eutectic Mo-Si-B alloys for high temperature applications
Hasemann, Georg; Krüger, Manja
In: Aachen: Shaker Verlag, Dissertation Otto-von-Guericke-Universität Magdeburg, Fakultät für Maschinenbau 2017, XIV, 90 Seiten - (Berichte aus der Werkstofftechnik), ISBN: 3844054081 [Literaturverzeichnis: Seite 77-88][Literaturverzeichnis: Seite 77-88]
2016
Peer-reviewed journal article
Near-eutectic ternary Mo-Si-B alloys - microstructures and creep properties
Hasemann, Georg; Kaplunenko, D.; Bogomol, Iurii; Krüger, Manja
In: JOM - New York, NY : Springer Science + Business Media, Bd. 68 (2016), Heft 11, S. 2847-2853
Microstructure variations and creep properties of novel high temperature V-Si-B materials
Krüger, Manja; Bolbut, Volodymyr; Gang, Florian; Hasemann, Georg
In: JOM - New York, NY : Springer Science + Business Media, Bd. 68 (2016), Heft 11, S. 2811-2816
Phase field simulation of a directional solidification of a ternary eutectic Mo-Si-B Alloy
Kazemi, O.; Hasemann, Georg; Krüger, Manja; Halle, Thorsten
In: IOP conference series / Materials science and engineering - London [u.a.] : Institute of Physics - Vol. 118.2016, 1, Art. 012028, insgesamt 9 S. [18th Chemnitz Seminar on Materials Engineering]
Microstructure evolution of a directionally solidified ternary eutectic Mo-Si-B alloy
Krüger, Manja; Hasemann, Georg; Kazemi, Omid; Halle, Thorsten
In: Materials science forum - Baech : Trans Tech Publications Ltd., Bd. 879 (2016), S. 1226-1232
Non-peer-reviewed journal article
Struktura i vlastivosti sprjamovano zakristalizovanogo splavu sistemi Mo-8,7 Si-18 B - Structure and properties of directionally solidified Mo-8.7 Si-18 B alloys
Bogomol, Iurii; Popovych, Olha; Hasemann, Georg; Krüger, Manja; Loboda, P. I.
In: Naukovi visti Nacional'noho Techničnoho Universytetu Ukraïny Kyïvs'kyj Politechničnyj Instytut / Nacional'nyj techničnyj universytet Ukraïny "Kyïvs'kyj politechničnyj instytut" - Kyïv . - 2016, Heft 2, S. 69-76
2015
Peer-reviewed journal article
Polymer-derived ceramics as innovative oxidation barrier coatings for Mo-Si-B alloys
Hasemann, Georg; Baumann, Torben; Dieck, Sebastian; Rannabauer, Stefan; Krüger, Manja
In: Metallurgical and materials transactions. A, Physical metallurgy and materials science - Boston : Springer, Bd. 46 (2015), Heft 4, S. 1455-1460
2014
Book chapter
Mikrostruktur und Oxidationsbeständigkeit der Legierung Mo-8,7Si-17,4B
Bolbut, Volodymyr; Hasemann, Georg; Bogomol, Iurii; Loboda, P. I.; Krüger, Manja
In: 15. Sommerkurs Werkstoffe und Fügen - Magdeburg, 12. und 13. September 2014 , 2014 - Magdeburg : Univ., S. 135-142 Kongress: Sommerkurs Werkstoffe und Fügen 15 Magdeburg 2014.09.12-13
Mikrostruktur und Kriechverhalten einer nah-eutektischen gerichtet erstarrten Mo-Si-B-Legierung
Hasemann, Georg; Bogomol, Iurii; Schliephake, Daniel; Loboda, Petr I.; Krüger, Manja
In: 15. Sommerkurs Werkstoffe und Fügen: Magdeburg, 12. und 13. September 2014 - Magdeburg: Univ., S. 127-134Kongress: Sommerkurs Werkstoffe und Fügen 15 (Magdeburg : 2014.09.12-13)
Oxidationsschutz von Molybdän-Basiswerstoffen durch Beschichtung mit präkeramischen Polymeren
Dieck, Sebastian; Baumann, Torben; Hasemann, Georg; Rannabauer, Stefan; Krüger, Manja
In: 15. Sommerkurs Werkstoffe und Fügen - Magdeburg, 12. und 13. September 2014 - Magdeburg: Univ., S. 143-148, 2014Kongress: Sommerkurs Werkstoffe und Fügen 15 (Magdeburg : 2014.09.12-13)
Peer-reviewed journal article
Vacancy strengthening in Fe 3Al iron aluminides
Hasemann, Georg; Schneibel, J. H.; Krüger, Manja; George, E. P.
In: Intermetallics - Amsterdam [u.a.]: Elsevier Science, Bd. 54.2014, S. 95-103
Microstructure and creep properties of a near-eutectic directionally solidified multiphase Mo-Si-B alloy
Hasemann, Georg; Bogomol, Iurii; Schliephake, Daniel; Loboda, Petr I.; Krüger, Manja
In: Intermetallics - Amsterdam [u.a.]: Elsevier Science, Bd. 48.2014, S. 28-33
2013
Book chapter
Polysilazane-type polymer derived ceramic coatings on titanium metal
Smokovych, Iryna; Rannabauer, Stefan; Scheffler, Michael; Hasemann, Georg
In: Effizienz, Präzision, Qualität - 11. Magdeburger Maschinenbau-Tage ; 25. und 26. September 2013 an der OVGU - Magdeburg : Univ. - 2013, Paper B6-3, insgesamt 7 S. Kongress: Magdeburger Maschinenbau-Tage 11 Magdeburg 2013.09.25-26
Peer-reviewed journal article
Multiphase Mo-Si-B alloys processed by directional solidification
Krüger, Manja; Hasemann, Georg; Bogomol, Iurii; Loboda, Petr I.
In: MRS online proceedings library / Materials Research Society - Warrendale, Pa. : MRS, Bd. 1516 (2013)
2012
Original article in peer-reviewed international journal
Dependence of the yield stress of Fe 3Al on heat treatment
Hasemann, Georg; Schneibel, J. H.; George, E. P.
In: Intermetallics. - Barking : Elsevier Science Publ., Bd. 21.2012, 1, S. 56-61
2011
Book chapter
Mechanisches Verhalten von Fe 3Al in Abhängigkeit der vorangegangenen Wärmebehandlung
Hasemann, G.; Schneibel, J. H.; Krüger, Manja; George, E. P.
In: 14. Sommerkurs Werkstoffe und Fügen , 2011 - Magdeburg : Universität Magdeburg ; Mook, Gerhard, S. 201-206 Kongress: Sommerkurs Werkstoffe und Fügen 14 Magdeburg 2011.09.23-24
Peer-reviewed journal article
Temperature dependence of the strength of fine- and ultrafine-grained materials
Schneibel, J. H.; Heilmaier, M.; Blum, W.; Hasemann, Georg; Shanmugasundaram, T.
In: Acta materialia - Amsterdam [u.a.]: Elsevier Science, Bd. 59.2019, 3, S. 1300-1308, 2011
Article in conference proceedings
Dependence of the yield stress of Fe3Al on heat treatment
Hasemann, Georg; Schneibel, J. H.; Krüger, Manja; George, E. P.
In: FeAl2011 - Discussion Meeting on the Development of Innovative Iron Aluminium Alloys, Lanzarote (Canary Island), 05 - 07 October 2011 - Madrid, S. 109-112
Seit 10/2019 | wissenschaftlicher Mitarbeiter am Institut für Werkstoff- und Fügetechnik der OVGU Magdeburg (Abteilung Werkstoffsynthese und mechanische Prüfung) |
2017 - 2019 | Post-Doktorand am Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung, Werkstoffstruktur- und -eigenschaften (IEK-2) |
03/2017 | Promotion zum Thema Microstructure and Properties of Near-eutectic Mo-Si-B Alloys for High Temperature Applications, OVGU Magdeburg |
2011 - 2017 | wissenschaftlicher Mitarbeiter am Institut für Werkstoff- und Fügetechnik der OVGU Magdeburg |
09/2011 | Abschluss des Studiums Maschinenbau/Vertiefungsrichtung Werkstofftechnik |
2010 - 2011 | Auslandssemester/-praktikum, The dependence of the yield stress of Fe3Al on its heat treatment, Oak Ridge National Laboratory und University of Tennessee Knoxville, TN, USA |
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