Elastic Properties of a Sc-Zr-Nb-Ta-Rh-Pd High-Entropy Alloy Superconductor

Abstract

We report a comprehensive study on the elastic properties of a hexanary high-entropy alloy superconductor (ScZrNbTa) 0. 685 [RhPd] 0. 315 at room and cryogenic temperatures, by Resonant Ultrasound Spectroscopy experiments. The derived elastic constants are bulk modulus K = 132.7 GPa, Young’s modulus E = 121.0 GPa, shear modulus G = 44.9 GPa, and Poisson’s ratio ν =0.348 for room temperature. The Young’s and shear moduli are ∼ 10% larger than those in NbTi/Cu composite superconductor with similar T c , while the ductility is comparable. Moreover, the mechanical performance is further enhanced at cryogenic temperature. Our work confirms the advantageous mechanical properties of high-entropy alloy superconductors and suggests the application prospects.

Keywords: high-entropy alloy, Superconductor, elastic constants