Superelasticity of (TiZrHf)50Ni25Co10Cu15 high entropy shape memory alloy

Abstract The paper elucidates the superelastic characteristics of high entropy shape memory alloy (HESMA) (TiZrHf)50Ni25Co10Cu15 over a wide range of deformation temperatures. Axial compression experiments are presented for different heat treatments and local recoverable strains up to 5% are noted. Superelasticity is observed over a large temperature range up to 175°C. Depending on heat treatment, the critical stress exhibits a Clausius-Clapeyron (CC) slope between 1.4 and 6 MPa/°C up to 80 °C deformation temperature. Obvious deviations from linearity however and significantly higher transformation stresses reaching 1200 MPa are reported at higher temperatures. The temperature change during transformation is reported at 9 °C.