Berlin 2015 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 28: Poster Session II

MM 28.33: Poster

Tuesday, March 17, 2015, 18:30–20:30, Poster E

(Nano-)Mechanical properties of intermetallic phases in the Fe-Mo system at elevated temperatures — •Sebastian Schröders and Sandra Korte-Kerzel — Institut für Metallkunde und Metallphysik, RWTH Aachen University, Kopernikustrasse 14, 52056 Aachen, Deutschland

Topologically close packed (TCP) intermetallic phases which precipitate in nickel-base superalloys are suspected to cause a deterioration of the mechanical properties of the γ - γ* matrix. Although the existing intermetallics, namely Laves-, R-, sigma- and mue-phases are well understood in terms of their structure, their mechanical properties have still not been investigated in detail due to their size and pronounced brittleness. In order to investigate the plastic deformation behavior of these phases, but exclude the effect of complex phase composition in the first instance, the Fe-Mo system was chosen as a model system, where all phases are available as binary alloys. Using nanomechanical testing methods like nanoindentation and micropillar-compression, the experimental challenges of high brittleness and anisotropy encountered in conventional testing can be disregarded and plastic deformation can be achieved due to the confining pressure in nanoindentation and the reduction in specimen size in microcompression. This work aims to examine the mechanical properties such as elastic modulus, yield and flow stress of intermetallic Fe-Mo phases over a range of temperatures. To this end, tests were performed in vacuum. Based on this type of study it is envisaged to form a better understanding of the way hard TCP precipitates influence the performance of superalloys.