Quasi-static and dynamic compressive behavior of Zr-based bulk metallic glass with yttrium addition

The glass-forming ability, stress-strain relationships, and fracture characteristics of Zr60-xCu27Al8Fe5Yx (x =1, 3 and 5 at%) bulk metallic glasses are investigated under compressive strain rates ranging from 10-3 to 4 x 103 s � 1 using a material testing system and split-Hopkinson pressure bar. The results show that yttrium addition leads to a broader supercooled liquid region (& UDelta;Tx) and a greater & gamma; parameter (& gamma; = Tx/(Tg+Tl)), particularly for x = 1 at%. For all of the tested alloys, the fracture stress increases with increasing strain rate, while the fracture strain decreases. The addition of 3 at% Y results in the highest fracture stress and an improved fracture strain. The fracture surface observations show that the fracture behavior of the BMGs is dominated by the strain rate, whereas the Y content plays only a minor role.

Automated summary

The glass-forming ability, stress-strain relationships, and fracture characteristics of Zr60-xCu27Al8Fe5Yx (x =1, 3 and 5 at%) bulk metallic glasses are studied under compressive strain rates ranging from 10-3 to 4 x 103 s^-1. Yttrium addition broadens the supercooled liquid region and increases the γ parameter, especially for x = 1 at%. Fracture stress increases with increasing strain rate for all tested alloys, while fracture strain decreases. Addition of 3 at% Y results in the highest fracture stress and improved fracture strain. Fracture behavior is primarily influenced by strain rate, while Y content has a minor role.