The variation of the power dissipation efficiency with the strain rate and deformation temperature constitutes a power dissipation map. The power consumption at various strains is different and every domain in the power dissipation map directly corresponds to a specific microstructure evolution mechanism. In general, the high value of indicates the occurrence of DRX during hot deformation which thus leads to the reconstruction of the original microstructure. However, the phenomenon of flow instability may occur in the hot deformation, which can result in deformation defects such as flow localization, deformation bands, and cracks. Hence, the flow instability should be avoided and the precise prediction of deformation defects is very necessary. Here, the extremum principles of irreversible thermodynamics as applied to continuum mechanics of large plastic flow are employed to define whether flow instability has occurred [50]. The instability criterion is derived by
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