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MM: Metall- und Materialphysik

MM 25: Poster Session

MM 25.11: Poster

Mittwoch, 29. März 2006, 15:30–17:30, P4

Advanced high strength and ductile Fe-based materials — •Katarzyna Werniewicz¹, Uta Kühn¹, Norbert Mattern¹, Birgit Bartusch¹, Ludwig Schultz¹, and Tadeusz Kulik² — ¹IFW Dresden, P.O. Box 270016, D-01171 Dresden, Germany — ²Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland

We report about phase formation and mechanical behavior of copper mold cast Fe-Cr-Mo-Ga alloys. The rod-shaped samples with a diameter of 3 mm were prepared by centrifugal casting technique using different crucible materials. Interestingly, the samples prepared under different conditions show significant different microstructures and mechanical properties. It was found that one of the samples consists of a ductile bcc α-Fe phase embedded in a fcc Fe₃Ga. In order to characterize the mechanical properties of our alloy, Vickers hardness and room temperature compression tests were performed. The measured hardness of the α-Fe phase is about two times smaller (4.48 GPa) than the hardness of Fe₃Ga (8.08 GPa). The combination of the ductile and high strength phase leads to a material with high fracture strength (3 GPa) connected with excellent ductility (15%). This mechanical behavior has never been observed before for any Fe-based crystalline as well as bulk glassy alloys. We assume that these unique mechanical characteristics result from the formation of the specific two-phase structure, which occurs during the casting considering certain parameters.