Regensburg 2007 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 43: Mechanical properties II
MM 43.2: Talk
Friday, March 30, 2007, 11:15–11:30, H6
Novel high-strength Fe-based composite materials with large plasticity — •Katarzna Werniewicz1,2, Uta Kühn1, Norbert Mattern1, Jürgen Eckert1, Uwe Siegel1, Birgit Bartusch1, 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, ul. Woloska 141, 02-507 Warsaw, Poland
Among glass-forming alloy systems reported so far, Fe-based bulk metallic glasses play a special role. Compared to other amorphous alloys e.g. Zr-, Ti-based, such glasses show superior mechanical strength. However, due to the general brittleness their wider application as structural materials is strongly restricted. The alternative approach to overcome this defect is to design BMG composites. In this work we present a series of new Fe-Cr-Mo-Ga-(Si,C) composite materials derived from an Fe-Cr-Mo-Ga-C-P-B glassy alloy, with the aim to improve the ductility of this high-strength material. The effect of the composition and the phase formation on the resulting mechanical properties was investigated. It has been found that the formation of a complex microstructure, which essentially consists of soft Ga-rich dendrites embedded in a hard Cr- and Mo-rich matrix, leads to a material with excellent compressive mechanical properties. While the obtained values of true strength are comparable with data reported for Fe-Cr-Mo-Ga-C-P-B BMG, the values of true strain are greatly improved for investigated composites.