Plasticity improvement of Zr_(55)Al_(10)Ni_5Cu_(30) bulk metallic glass by remelting master alloy ingots

摘要

The effect of repeated melting of master alloy ingots on the bending properties of Zr_(55)Al_(10)Ni_5Cu_(30) bulk metallic glass (BMG) was investigated. The bending plasticity of Zr_(55)Al_(10)Ni_5Cu_(30) BMG was found to be improved with the increased remelting times. When the BMG sample cast from the master alloy ingot remelted 10 times is bent, it does not fracture even though the bending angle increases to 100°, but the maximum bending stress and elastic strain remain almost constant. The bending plasticity improvement may be attributed to the fact that the increased remelting times result in more free volume and more disordered and homogeneous microstructure in the BMG, which favors the initial nucleation of profuse shear bands and reduces the probability of catastrophic fracture.