Dr.-Ing. Julia Becker
Dr.-Ing. Julia Becker
Werkstofftechnik
Current projects
High-Performance FeAlCuNiTi-Based Metal Matrix Composites for High-Temperature Applications
Duration: 01.07.2024 bis 30.06.2026
As part of the scientific and technical collaboration, the aim is to produce high-performance metal-matrix composites based on multi-component materials for high-temperature applications. In particular, the production of multicomponent materials is simplified by a combination of classic powder metallurgy and spark plasma sintering processes and should guarantee significantly improved (mechanical) properties. This method makes it possible to implement a material design tailored to specific applications and at the same time represents a scientific and technological challenge. In addition, the addition of ceramic particles makes it possible to increase the strength of the alloys. The technology to be tested could be applied on an industrial scale in the future.
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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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ME-MAT: Production-related optimization of metallic high-temperature materials
Duration: 01.01.2024 bis 31.12.2025
The overarching aim of the ME-MAT project is to establish a network between cooperation partners from Germany, Poland, Bulgaria and Hungary.
The scientific focus is on adapting powder production for additive manufacturing processes. As the envisaged multiphase material from the group of refractory metals has an extremely high melting temperature and is also very reactive under environmental conditions, challenging research questions arise.
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Completed projects
New alloying strategies for Mo-based high temperature materials
Duration: 01.10.2019 bis 30.06.2023
The demand for new high temperature alloys increases due to economic reasons and stricter climate protection and resource conservation requirements. For applications in the field of energy conversion, new Mo-Si-B materials are in the focus of current research. There is a specific interest in alloys with a continuous Mo matrix phase and silicide particles, which provide an acceptable fracture toughness and high creep resistance at the same time.
A drawback of potential applications of Mo-Si-B alloys, e.g. as rotating turbine blades, is the density of > 9 g/cm³. Therefore, this project aims into a density reduction of this alloy type, meeting values of < 8 g/cm³. This is challenging because significant losses in the fracture toughness and the creep resistance should be avoided.
Micro-macro interactions in structured media and particle systems GRK 1554
Duration: 01.10.2014 bis 31.03.2019
Subproject: Microstructural damage of coated AlSi materials under mechanical and thermal stress
Editing: Dipl.-Ing. Philipp G. Thiem
New intermetallic coating systems on AlSi substrates are being investigated. The coated materials are subjected to both static and cyclic loads in order to investigate the effects of the alloy composition, the microstructure and the coating thickness on crack formation and crack propagation in the application-relevant temperature range. Material parameters, e.g. the modulus of elasticity, and other parameters such as the adhesive strength of the coating are to be included in the modeling of the damage mechanisms in this material composite.
Subproject: Crack initiation and crack propagation in multiphase high-temperature materials
Editing: M.Sc. Julia Becker
Multiphase high-temperature materials are investigated with regard to crack initiation in the individual phases, crack propagation and their fracture toughness. Initial experiments on crack initiation and crack propagation were carried out on Mo-Si-B alloys produced by powder metallurgy using the indentation fracture mechanics method. The findings are to be transferred to directionally solidified multiphase molybdenum materials.
Collaboration in other sub-projects:
* Experimental Investigations and Numerical Simulations of Lamellar Cu-Ag Composites
Editing: M. Sc. Srihari Dodla
Supervision: Prof. A. Bertram, Prof. M. Krüger
* Crystal Viscoplasticity Based Simulation of Ti-Al Alloy under High-Temperature Conditions
Editing: M. Sc. Helal Chowdhury
Supervision: Prof. K. Naumenko, Prof. H. Altenbach, Prof. M. Krüger
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2025
Peer-reviewed journal article
A comparative analysis of in vivo-generated and artificial CoCrMo wear particles created by high-energy ball milling and the Buchhorn method
Buchholz, Adrian; Höpfer, Rebecca; Becker, Julia; Voropai, Vadym; Schmelzer, Janett; Krüger, Manja; Bertrand, Jessica
In: Materials - Basel : MDPI, Bd. 18 (2025), Heft 3, Artikel 643, insges. 14 S.
2024
Peer-reviewed journal article
Improved creep resistance of Mo-V-Si-B alloys with a density below 8 g/cm³
Becker, Julia; Krüger, Manja
In: Intermetallics - Amsterdam [u.a.] : Elsevier Science, Bd. 169 (2024), Artikel 108277, insges. 7 S.
2022
Peer-reviewed journal article
High temperature oxidation performance of an additively manufactured Mo9Si8B alloy
Becker, Julia; Schmigalla, Sven; Schultze, Sabine; Rittinghaus, Silja-Katharina; Weisheit, Andreas; Schmelzer, Janett; Krüger, Manja
In: Oxidation of metals - Dordrecht [u.a.] : Springer Science + Business Media B.V, Bd. 97 (2022), S. 167-181
Enhanced fracture toughness and high-temperature strength of directionally solidified Mo-XC alloys
Becker, Julia; Breuer, Danio; Bogomol, Jurii; Krüger, Manja
In: Crystals - Basel : MDPI, Bd. 12 (2022), Heft 11, Artikel 1534, insges. 8 S.
2020
Peer-reviewed journal article
The effects of Zr and La2O3 additions on the microstructural and mechanical properties of a Mo-6Si-5B alloy
Becker, Julia; Giese, Marcel; Krüger, Manja
In: IOP conference series / Institute of Physics - London [u.a.] : Institute of Physics - Vol. 882 (2020), Paper 012001, insgesamt 7 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
Book chapter
Effects of second phases in Mo-Zr Alloys - a study on phase evolution and mechanical properties
Becker, Julia; Siems, Heiko F.; Krüger, Manja
In: Advances in mechanics of high-temperature materials - Cham : Springer . - 2019, S. 93-105 [First online]
Peer-reviewed journal article
Site preference of V and its influence on the elastic properties in the boride series VxMo5-xSiB2 as studied by first principles density functional theory
Touzani, Rachid Stefan; Becker, Julia; Krüger, Manja
In: Journal of alloys and compounds - Lausanne : Elsevier . - 2019 [Online first]
Dissertation
Development of density reduced Mo-Si-B alloys
Becker, Julia; Krüger, Manja; Skrotzki, Birgit
In: Barleben: docupoint Verlag, 2020, Dissertation Otto-von-Guericke-Universität Magdeburg, Fakultät für Maschinenbau 2019, XVI, 117 Seiten - (Micro-macro transactions; Volume 36; docupoint Wissenschaft), ISBN: 978-3-86912-167-3 [Literaturverzeichnis: Seite 99-114][Literaturverzeichnis: Seite 99-114]
2018
Peer-reviewed journal article
Density reduction of Mo-Si-B alloys by vanadium alloying
Becker, Julia; Betke, Ulf; Hoffmeister, Michael; Krüger, Manja
In: JOM - New York, NY : Springer Science + Business Media, Bd. 70 (2018), Heft 11, S. 2574-2581
Alloying effects in Mo-5X (X=Zr, Ti,V) Microstructural modifications and mechanical properties
Becker, Julia; Betke, Ulf; Wessel, Egbert; Krüger, Manja
In: Materials today - Amsterdam [u.a.] : Elsevier, Bd. 15 (2018), S. 314-321
2017
Book chapter
Der Einfluss der Legierungselemente Ti, V und Zr auf die mechanischen Eigenschaften des Mo-Mischkristalls
Becker, Julia; Krüger, Manja
In: 16. Sommerkurs Werkstoffe und Fügen - Magdeburg, 08. und 09. September 2017 , 2017 , korrigierte Auflage - Magdeburg : Universitätsbibliothek ; Mook, Gerhard, S. 169-178
2015
Peer-reviewed journal article
Impact of phase distribution on the fracture toughness of high temperature resistant Mo-Si-B Alloys - Der Einfluss der Phasenverteilung auf die Bruchzähigkeit von hochtemperatur-beständigen Mo-Si-B-Legierungen
Becker, Julia; Krüger, Manja
In: Practical metallography - München : Hanser, Bd. 52 (2015), Heft 6, S. 295-313