Mechanical properties and thermally activated plasticity of the Ti30Zr25Hf15Nb20Ta10 high entropy alloy at temperatures 4.2-350Â K

Mechanical properties of the Ti30Zr25Hf15Nb20Ta10 high entropy bcc alloy have been studied in wide range of low temperatures (4.2-350 K). Values of microhardness and Young modulus at 300 K, temperature dependencies of the yield strength, deforming stress and strain rate sensitivity have been registered and analyzed in framework of thermally activated deformation models. Empirical estimates have been made of the microscopical parameters of plasticity, such as Peierls stress, activation energy for dislocations, as well as level of internal stresses.