Abstract
The Zr55Cu30Al10Ni5 BMG as a base alloy was alloyed with Hf and Ti to develop a high entropy bulk metallic glass. The aim of the present work was to investigate the superplastic formability of HE-BMG, which can be used for micro-forming applications. Therefore, thermal stability and crystallization kinetics of the newly developed HE-BMG was first studied and then the results were used for the designed hot deformation experiments. It was demonstrated that HE-BMG has higher thermal stability than the base BMG, supposedly due to the sluggish diffusion and high entropy effect. Hot deformation behavior of the developed HE-BMG was investigated and it was found that at temperature of 753 K and the strain rate of 2 × 10–5 s-1, the alloy shows a good superplastic deformation with a plastic strain of at least 50% at compression stress around 500 MPa that is good enough for near net shape forming.
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