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We report on an {[(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4}99.75Cu0.25 bulk glassy alloy (BGA) composite containing in situ formed α-(Fe,Co) and fcc-(Fe,Co)23B6 microcrystalline grains produced by copper mold casting. By adding 0.25 at. % Cu exhibiting positive mixing enthalpy with Fe, α-(Fe,Co) and fcc-(Fe,Co)23B6 phases with a grain size of 3μm precipitated from the melt during casting, yielding an in situ Fe-based BGA composite. The resulting Fe-based BGA composite shows not only a superhigh fracture strength of 4050MPa but also distinguished yielding combined with an enhanced plastic strain of 0.6% to failure in a compression relative to the [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 single-phase BGA.
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Shen et al. (2006) studied this question.
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