Ni-Based Refractory Bulk Amorphous Alloys with High Thermal Stability

摘要

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