  The present work deals with the microstructure and texture evolutions of a
TWIP high entropy alloy at various temperatures. Toward this end, the tensile
tests were conducted at temperatures ranging from 298 to 873 K under the strain
rate of 0.001s-1. The experimented material exhibited an extraordinary room
temperature work hardening behavior, in respect of both the instantaneous
strain hardening exponent and the work hardening rate values. This resulted in
an acceptable ultimate tensile strength /ductility balance and was justified
considering the high activity of twinning and planar slip. Such work hardening
capacity deteriorated at higher temperatures due to increasing the dislocation
annihilation rate and the stacking fault energy values that suppressed twin
formation and dislocation accumulation. However, the decrease in amplitude and
extent of the work hardening region was insignificant compared with other
single-phase high entropy alloys. This was attributed to the high capacity of
the alloy for dislocation storage at various deformation temperatures. The
serrated flow was observed at 773 and 873 K due to the dynamic strain aging
(DSA) mechanism. Interestingly, in this case, the DSA mechanism has a
beneficial effect on overall ductility, which was attributed to the increase in
the strain hardening exponent result in a delay of necking. Texture examination
also reveals the formation of a double fiber texture due to the simultaneous
contribution of twinning and octahedral slip.
