Mechanical properties and fracture behavior of the modified Ti-base bulk metallic glass-forming alloys

A Ti–Ni–Cu–Zr bulk metallic glass-forming alloy was modified by adding various percents of Ta for improving plasticity. The modified Ti-base alloys are investigated in terms of microstructure, mechanical properties and fracture behavior. (Ti26Zr12Cu53Ni9)0.7(Ti80Ta20)0.3 contains Ti2Ni particles and α′ + γ-TiCu matrix, and exhibits high yield strength and very high Young's modulus, but zero plasticity. (Ti26Zr12Cu53Ni9)0.5(Ti80Ta20)0.5 contains dendritic β-Ti(Ta) solid solution and α′ + γ-TiCu matrix, and exhibits high yield strength, high Young's modulus and distinct plasticity, showing significant plasticity-improvement after adding 10 at.% Ta into the alloy.