Mechanisms of Plastic Deformation in [(1)over-bar11]-Oriented Single Crystals of FeNiMnCrCo High Entropy Alloy

Single crystals of fcc Fe20Ni20Mn20Cr20Co20 (atom percent) high entropy alloy oriented along the [(1) over bar 11] direction are used to study flow curves and deformation mechanisms-slip, twinning under tensile deformation at early stages of plastic flow, epsilon = 2.5-5.0%, at the test temperature of 77 and 296 K. It is shown that twinning in [(1) over bar 11]-oriented single crystals is observed from the beginning of plastic flow when epsilon = 2.5-5.0% from 77 to 296 K. Plastic flow in [(1) over bar 11] -oriented single crystals under tension is developed with the high strain hardening coefficients 1800 and 2000 MPa, respectively, at 296 and 77 K. It is also characterized by a good plasticity of 58 and 60% and by a high level of stresses before fracture, 980 and 1580 MPa, respectively, at 296 and 77 K.