Superplastic behavior of Al15(CuFeMn)85 immiscible medium-entropy alloy

Abstract

In this study, the superplastic behavior and microstructural characteristics of the high pressure torsion-processed Al15(CuFeMn)85 immiscible medium-entropy alloy (IMMEA) were investigated. The multi-phase structure generated through spinodal-like decomposition in IMMEA played a key role in maintaining the ultra-fine structure and preserving an equiaxed shape during testing at high temperatures, ultimately leading to superplastic behavior. The IMMEA exhibited ∼460% superplasticity at a strain rate of 10−3 s−1 and a temperature of 873 K (0.56 homologous temperature). This study is the first IMMEA superplasticity study and these results contribute to a better comprehension of the phenomenon. © 2023 Elsevier Ltd