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

Amorphous alloys Cu50Pr30Ni10Al10−2xTixBx (x = 0, 0.05, 0.10, 0.15, 0.16 at.%) have been obtained by melt-spinning technology. Results show that Cu50Pr30Ni10Al9.9Ti0.05B0.05 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% Ti and 0.05% 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.