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 Zr _{60- x}Cu ₂₇Al ₈Fe ₅Y _x ( x =1, 3 and 5 at%) bulk metallic glasses are investigated under compressive strain rates ranging from 10 ⁻³ to 4 × 10 ³ 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 (Δ T _x) and a greater γ parameter ( γ = T _x/( T _g+ T _l)), 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.