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We report a comprehensive study on the elastic properties of a hexanaryhigh-entropy alloy superconductor (ScZrNbTa)$_{0.685}$[RhPd]$_{0.315}$ at roomand 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 $\nu$=0.348 forroom temperature. The Young's and shear moduli are $\sim 10\%$ larger thanthose in NbTi superconductor with similar $T_c$, while the ductility iscomparable. Moreover, the mechanical performance is further enhanced atcryogenic temperature. Our work confirms the advantageous mechanical propertiesof high-entropy alloy superconductors and suggests the application prospects.

Elastic properties of a Sc-Zr-Nb-Ta-Rh-Pd high-entropy alloy superconductor