Enhancing bulk metallic glass formation in Ni–Nb–Sn-based alloys via substitutional alloying with Co and Hf

Bulk metallic glasses have been formed over a fairly wide composition range (54-62 at.% Ni, 32-36 at.% Nb, and 3-11 at.% Sn) in the Ni-Nb-Sn ternary system. Partial substitution of Co for Ni and Hf for 1,;b improves the glass-forming ability, eventually leading to 4 mm glassy rods at the Ni56Co3Nb28Hf8Sn5 composition. The positive effects of these alloying elements have been explained based on a systematic monitoring of the amount and morphology of the competing crystalline phases as a function of the Co and Hf contents.

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