(a) Sharp stress drop in hot deformed HfNbTaTiZr RHEA at 1000 °C/10⁻³s⁻¹ and strain of 0.06 [32]. (b) Interrupted test on hot deformed HfNbTaTiZr RHEA at 1000 °C/10⁻³s⁻¹ and a strain of 0.06 and then restarted after holding for 0 s, 120 s, 300 s, or 600 s [32]. (c–e) Stress–strain curves of Ti₂ZrHfV_0.5Ta_0.2 RHEA at different strain rates (10⁻¹ to 10⁻³) and temperatures (900–1000 °C) [69]. (f) Stress–strain curve of the strain aging experiment on the Ti₂ZrHfV_0.5Ta_0.2 RHEA at °C/10⁻¹ s⁻¹ through to the strain of ∼0.1 for three times, with intervals between the first and third hot deformation of 0 s and 600 s [69].