Effect of microalloying on glass formation and thermal stability of Cu-Pr-based amorphous alloys

摘要

Amorphous alloys Cu_(50)Pr_(30)Ni_(10)Al_(10 - 2x)Ti_xB_x (x = 0, 0.05, 0.10, 0.15, 0.16 at. percent) have been obtained by melt-spinning technology. Results show that Cu_(50)Pr_(30)Ni_(10)Al_(9.9)Ti_(0.05)B_(0.05) melt-spun ribbon at a surface velocity of 38.5 m/s is fully amorphous, while partial amorphous structure can be obtained with further additions. Differential scanning calorimeter (DSC) analyses indicate that minor addition of 0.05 percent Ti and 0.05 percent B can improve the thermal stability of melt-spun amorphous alloys, while further additions show reverse influence. The effects of Ti and B are that minor addition increases the tendency of new phases formation, and appropriate addition can suppress the formation of crystalline phases.