Mg-based bulk metallic glass composites with plasticity and high strength

Ma, H.; Xu, J.; Ma, E.
October 2003
Applied Physics Letters;10/6/2003, Vol. 83 Issue 14, p2793
Academic Journal
Composite alloys of (Mg[sub 0.65]Cu[sub 0.075]Ni[sub 0.075]Zn[sub 0.05]Ag[sub 0.05]Y[sub 0.1])[sub 100-x]Fe[sub 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 α-Fe solid solution precipitates uniformly with sizes in the 1–10 μm range while the remaining melt undergoes a glass transition. The in situ composite has a compressive strength as high as ∼1 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. © 2003 American Institute of Physics.


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