Abstract The effect of severe warm-rolling on the microstructure and texture development in FCC equiatomic CoCrFeMnNi HEA was investigated in the present work. For this purpose, the HEA was warm-rolled to 90% reduction in thickness at 600 °C and annealed for 1 h at temperatures up to 1200 °C. To highlight the effect of warm-rolling, a critical comparison was made with similarly deformed and annealed cold-rolled HEA. The warm-rolled HEA showed an ultrafine lamellar microstructure, which was, however, significantly coarser than the cold-rolled HEA. The significantly coarser microstructure in the warm-rolled HEA could be attributed to the dynamic annihilation of dislocations during deformation. Warm-rolled HEA showed a pure metal or copper type texture instead of a predominantly brass type texture in the cold-rolled HEA. The stark differences in the deformation texture could be attributed to the increase in the SFE at the temperature of warm-rolling, which promoted more homogeneous deformation by dislocation slip over twin mediated deformation and extensive shear band formation. The lower stored energy and coarser deformation structure of the warm-rolled HEA resulted in higher recrystallization temperature, and consistently larger recrystallized grain size than the cold-rolled HEA. Annealing also resulted in the weakening of the recrystallization texture owing to the absence of strong preferential nucleation or growth. The HEA warm-rolled and annealed at 750 °C resulted in a fine-grained, completely recrystallized microstructure with the optimum strength-ductility combination. The present results revealed that warm-rolling could be effectively used as a processing route for tailoring microstructure and properties of CoCrFeMnNi HEA.

中文翻译：

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等原子 CoCrFeMnNi 高熵合金的剧烈温轧介导的显微组织和织构：与冷轧的比较

摘要 在目前的工作中，研究了剧烈温轧对FCC 等原子CoCrFeMnNi HEA 组织和织构发展的影响。为此，将 HEA 在 600 °C 下温轧至厚度减少 90%，并在高达 1200 °C 的温度下退火 1 小时。为了突出温轧的效果，对类似变形和退火的冷轧 HEA 进行了重要比较。温轧 HEA 显示出超细层状微观结构，然而，其明显比冷轧 HEA 粗糙。热轧 HEA 显着更粗的微观结构可归因于变形过程中位错的动态湮灭。热轧 HEA 显示出纯金属或铜型织构，而不是冷轧 HEA 中主要的黄铜型织构。变形织构的明显差异可归因于温轧温度下 SFE 的增加，这通过孪生介导的变形和广泛的剪切带形成的位错滑移促进了更均匀的变形。与冷轧 HEA 相比，温轧 HEA 较低的储存能量和较粗的变形结构导致更高的再结晶温度和更大的再结晶晶粒尺寸。由于没有强烈的优先形核或生长，退火还导致再结晶织构的减弱。HEA 在 750 °C 温轧和退火后形成细晶、完全再结晶的显微组织，并具有最佳的强度-延展性组合。