Characterization of Nanocrystal Dispersed Cu₆₀Zr₃₀Ti₁₀ Metallic Glass

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The microstructures of Cu₆₀Zr₃₀Ti₁₀ metallic glass prepared by injection casting and melt-spinning have been investigated by transmission electron microscopy (TEM), and three dimensional atom probe (3DAP). The as-cast 2 mm diameter rod sample contained Cu-rich nanocrystals in the amorphous matrix, while the melt-spun ribbon was fully amorphous. The composition of the Cu-rich nanocrystals was around Cu₇₆Zr₁₉Ti₅ with the fcc structure (lattice parameter a=0.37 nm), which is a metastable Cu phase supersaturated with Zr and Ti. Annealing the as-cast rod at 713 K (T_g) for 10 min led to a decrease in compressive plastic strain from 1.8 to 0.6% accompanied by an increase in the volume fraction of the Cu-rich crystal.