Microstructure and Room Temperature Properties of a High-Entropy TaNbHfZrTi Alloy (Postprint).

摘要

A new refractory alloy, Ta20Nb20Hf20Zr20Ti20, produced by vacuum arc-melting followed by hot isostatic pressing (HIPing) at T = 1473K and P = 207MPa for 3 h has predominantly a single-phase body-centered cubic (BCC) structure with the lattice parameter a = 340.4 pm. The alloy density and Vickers microhardness are p = 9.94 g/cm3 and Hv = 3826 MPa. The alloy has high compression yield strength (o0 2 = 929 MPa) and ductility ( > 50%). The alloy shows considerable strain hardening and homogeneous deformation. A simple model of solid-solution strengthening is proposed to explain the behavior.