Abstract
Temperature-dependent deformation behavior of [110] oriented micropillars of HfTaTiVZr refractory high entropy alloy (RHEA) was studied. Engineering stress–strain curves, strain rate sensitivity measurements, and in-situ observations revealed distinct deformation mechanisms at different temperatures: homogeneous at room temperature (RT), intermittent plasticity at 200 °C, chaotic stress drops at 400 °C, brittle failure at 600 °C, and creep-like behavior at 800 °C. Deformation morphology of the micropillars showed activation of few slip systems at RT and 200 °C, multiple slip systems at 400 °C, catastrophic failure at 600 °C, and minimal slip activity at 800 °C. These findings offer unique insights into the deformation of RHEAs.
Published Version
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