Abstract
Zr-rich Zr–Ti–Ni(Cu) alloy system with deep eutectics was investigated for bulk metallic glass (BMG) compositions. The BMGs were investigated by locating deep eutectic compositions and by evaluation of alloys near it. When Cu was added to the Zr 45Ti 21Ni 34 eutectic alloy as an additional melting point depressant, even lower melting eutectics were obtained. A new quaternary eutectic alloy was found with a composition of Zr 49Ti 17Ni 20Cu 14. The microstructure consists of three glass forming compounds of Zr 2Ni, Zr 2Cu, and (Zr,Ti) 2Ni. By examining alloys around the new quaternary eutectic alloy, a BMG with a glass forming ability of 4 mm diameter was found at the off-eutectic Zr 49Ti 14Ni 20Cu 17 composition. The study confirmed the composition of the best glass former near the eutectic point. The searching method for BMGs starting from a deep eutectic alloy as a reference point is described.
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