Homogeneous deformation of Ti41.5Cu37.5Ni7.5Zr2.5Hf5Sn5Si1 bulk metallic glass in the supercooled liquid region

The homogeneous deformation behavior of Ti41.5Cu37.5Ni7.5Zr2.5Hf5Sn5Si1 BMG has been investigated by compression tests. The results show that its high-temperature deformation behavior is strongly dependent on strain rate and temperature, and there exists a transition from non-Newtonian flow to Newtonian flow with decrease in strain rate, which can be explained based on the transition state theory. In addition, this alloy can reach a large compressive strain than 0.8 at high strain rate; however the much higher flow stress and lower value of S parameter compared with typical BMGs indicates its worse formability in the SLR. A beneficial domain (temperature and strain rate) for optimum hot workability of this alloy has been roughly located by constructing the power dissipation efficiency map, where the power dissipation efficiency is larger than 0.8.