Strain-hardening properties of the high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion

Abstract An equiatomic MoNbTaTiVZr refractory high-entropy alloy (HEA) produced by arc melting was processed high-pressure torsion (HPT) at room temperature. Thermodynamic calculations and experimental results indicated a dual-phase microstructure composed of about 85% BCC Zr-depleted 15% Zr-rich phase in the as-cast condition. HPT causes grain refinement an increase dislocation density without formation new phases. After four revolutions, hardened to $$\sim $$ ? 540 HV, while exhibited softening with decrease hardness 480 HV. The occurrence vortex-like analysis elemental concentrations shear-induced mechanical homogenization, which supposed be cause observed softening.