Summary of flow stress behaviour of hot deformed refractory high entropy alloys.
|Alloy composition||Strain rate
|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.|||
|AlNbTi3VZr1.5||10−3 to 1||–||1100,1150, 1200,1250||All the flow stress softens, signifying the occurrence of DRX.|||
|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.|||
|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%.|||
|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.|||
|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.|||
|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.|||
|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|||
|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|||
|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.|||
|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).|||
|HfMoNbTaTiZr||10−3||–||800, 1000 and 1200||At 800 °C, work hardening occurred. At 1000 °C and 1200 °C, dynamic recrystallization occurred.|||
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