Composite alloys of (Mg0.65Cu0.075Ni0.075Zn0.05Ag0.05Y0.1)(100-x)Fe-x(x=9 and 13) have been produced through copper mold casting, based on a good bulk metallic glass former. Upon cooling the melt, an alpha-Fe solid solution precipitates uniformly with sizes in the 1-10 mum range while the remaining melt undergoes a glass transition. The in situ composite has a compressive strength as high as similar to1 GPa, a factor of 1.6 higher than the single-phase metallic glass. In contrast to all the previous Mg-based monolithic glasses that always fail in the elastic regime, a plastic strain to failure of the order of 1% was obtained for the Fe-toughened composite. (C) 2003 American Institute of Physics.
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