Ni-Based Refractory Bulk Amorphous Alloys with High Thermal Stability

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Enhancement of thermal stability and glass forming ability in Ni 60 Nb 40-x Ta x (x = 0, 3, 5, 10, 20 at%) alloys has been investigated. The crystallization temperature increases from 660°C in binary Ni 60 Nb 40 amorphous phase to 721°C in Ni 60 Nb 20 Ta 20 amorphous phase. The fully amorphous rod with diameter of 2 mm is fabricated in Ni 60 Nb 30 Ta 10 alloy by an injection casting method. The compressive failure strength of the Ni 60 Nb 30 Ta 10 bulk amorphous alloy is 3346 MPa.