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Dr.-Ing. Mike Schneider
Lehrstuhl Werkstoffwissenschaft
Institut für Werkstoffe
Fakultät für Maschinenbau
Ruhr-Universität Bochum
Universitätsstr. 150
44780 Bochum

Gebäude ICFO, Ebene 04, Raum 339
Activities: Research Assistant
On the processing and properties of high entropy alloys. Mike Schneider's work is linked to the research objectives of project B8 of the collaborative research center SFB/TR 103 (Single Crystal Superalloys), which is funded by the German Research Association (DFG). Single crystal Ni-base superalloys have microstructures, which consist of two phases, an ordered L12-phase, and a cubic face-centered solid solution. The ordered phase forms small cuboidal particles, which occupy about 75% of the volume of the material. These small γ′-cubes are separated by thin γ-channels (cubic face-centered crystal structure). The γ-channel material can be thought of as a complex solid solution because they can contain up to 10 alloy elements. One research objective of the project is to find out how increasing alloy complexity affects high temperature plasticity. To tackle this question systematically, the ternary system Co-Cr-Ni is considered first. Later, quarternary systems like Co-Cr-Ni-Al will receive due attention. All systems will be characterized with respect to phase stability during long term thermal exposure. For this purpose, their microstructures will be investigated using optical microscopy, scanning electron microscopy and transmission electron microscopy in combination with quantitative metallography. Most importantly, the mechanical properties (elastic constants, high temperature strength, and creep testing) will be characterized. The objective of the project is to contribute to a better understanding of elementary processes that govern the evolution of microstructure during processing and mechanical deformation of alloys.

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