A Maxwell-pulse constitutive model of Zr_(55)Cu_(30)Al_(10)Ni_5 bulk metallic glasses in supercooled liquid region

摘要

Stress overshoot related to the variation in free volume is an important phenomenon in cylinder compression tests of bulk metallic glasses (BMGs). A Maxwell-pulse constitutive model was proposed according to the overshoot of Zr_(55)Cu_(30)Al_(10)Ni_5 BMG in the supercooled liquid region (SCLR). Compression experiments and the constitutive model showed good agreement, especially with regard to the stress overshoot phenomenon. Furthermore, micro-backward extrusion experiments and numerical simulation were conducted in SCLR. The results showed that the constitutive model describes the mechanical behavior of the BMG well.