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Table 4

Summary of flow stress behaviour of hot deformed refractory high entropy alloys.

Alloy composition Strain rate
Strain Temp.
Findings References
AlNb2TiV 10−3 0.33 600, 800 and 1000 An increase in temperature leads to a decrease in yield stress, initially slowly at 600 and 800 °C, and then rapidly at 1000 °C. Softening with steady flow was observed indicating the occurrence of dynamic recovery. [80]
AlNbTi3VZr1.5 10−3 to 1 1100,1150, 1200,1250 All the flow stress softens, signifying the occurrence of DRX. [71]
ZrTiHfNb0.5Ta0.5 10−3 0.5 700, 800 and 900 The stress increased rapidly and then decreased to a stable value with an increase in deformation. [81]
WReTaMo 10−3 0.25 1600 At 1600 °C, the WReTaMo alloy shows continuous strengthening without peak stress until the final testing point at strain of 25%. [82]
Nb40Ti25Al15V10Ta5Hf3W2 10−3 0.69 800, 900 and 1000 Samples deformed at 800 °C show strain hardening. Samples deformed at 900 °C and 1000 °C show persistent softening after yielding which signifies dynamic recovery and dynamic recrystallization. [41]
Nb30Mo30Hf20Co20 10−4 0.6 600, 800 and 1000 Steep and delayed strain hardening stage was observed in the flow stress curves at 22 °C and 600 °C. Softening with steady-flow stages was observed at 1000 °C, signifying dynamic recovery. [83]
CxHf0.25NbTaW0.5 1−3 1000, 1200 and 1400 A continuous hardening after the yield was observed in all the specimens. As the temperature increased, the steady-state stress appeared at lower strain values. [84]
TaNbHfZrTi 10−5 to 10−1 750 Deformation strengthening occurred and the flow stress increased continuously with an increase in the plastic strain at high-strain rates [50]
TixZrVNb 10−3 600 and 800 At 800°C, the strengths of the alloys significantly decreased. Furthermore, a serrated curve was also observed at 800 °C due to the alternating softening deformation and recrystallization [85]
HfMoNbTaTi 10−2 0.8 800, 1000 and 1200 A continuous drop in the flow stress started at the peak stress (strain = 0.027), proceeded by a steady-state flow stage from a strain of 0.8. Dynamic recrystallization behaviour was observed during compression at 1200 °C. [86]
NbCrMo0.5Ta0.5TiZr 10−3 800, 1000 and 1200 At 1000 °C, dynamic recrystallization of the alloy occurs after a short stage of strain hardening. At 1200 °C, further decrease in the flow stress, followed by weak softening and a steady state flow (dynamic recovery). [52]
HfMoNbTaTiZr 10−3 800, 1000 and 1200 At 800 °C, work hardening occurred. At 1000 °C and 1200 °C, dynamic recrystallization occurred. [87]

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