Berlin 2008 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 30: Mechanical Properties II

MM 30.2: Talk

Wednesday, February 27, 2008, 16:00–16:15, H 0111

Fe-based composite materials with improved mechanical properties — •Katarzyna Werniewicz^1,2, Uta Kühn¹, Norbert Mattern¹, Jürgen Eckert¹, Ludwig Schultz¹, and Tadeusz Kulik² — ¹IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — ²Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland

Following a previous study by the authors two new compositions (Fe_89.0Cr_5.5Mo_5.5)₉₁C₉ and (Fe_89.0Cr_5.5Mo_5.5)₈₃C₁₇ have been developed with the aim of improving the ductility of Fe_65.5Cr₄Mo₄Ga₄P₁₂C₅B_5.5 bulk metallic glass (BMG). In contrast to the alloys in that study, the recently prepared Fe-based materials are Ga-free. It was expected that the variations in the composition will lead to the changes in the phase formation and, hence, in the mechanical response of the investigated alloys. It was recognized that in-situ formed Fe-based composites show superior plasticity (є_pl≈37%) for the alloy with lower C content and (є_pl≈4%) for the alloy with higher C content compared to monolithic glass (є_pl≈0.2%). Furthermore, on the basis of present as well as previous investigations it has been shown that the Ga addition is beneficial for the plasticity of these Fe-based alloys. It was observed that the (Fe_89.0Cr_5.5Mo_5.5)₈₃C₁₇ alloy exhibits a significantly smaller fracture strain (є_f≈5%) compared to its Ga-containing counterpart (є_f≈16%). Therefore, it can be concluded that appropriate alloying additions are crucial in enhancing the mechanical properties of the complex Fe-based materials developed here.