The influence of the physical mechanisms activated during deformation and annealing on the microstructure and texture evolution as well as on the mechanical properties in the equiatomic CoCrFeMnNi high-entropy alloy (HEA) were investigated. A combination of cold rolling and annealing was used to investigate the HEA in the deformed, recovered, partially recrystallized, and fully recrystallized states. Detailed microstructure and texture analysis was performed by electron backscatter diffraction, transmission electron microscopy, and X-ray diffraction. The mechanical properties were evaluated using uniaxial tensile testing. A specific focus of this investigation was put on studying the influence of deformation and annealing twinning on the material behavior. It was substantiated that during cold rolling deformation, twinning facilitates the transition from the Cu-type to the Brass-type texture, whereas annealing-twinning leads to a strong modification of the texture formed during recrystallization. The formation of specific twin orientations and the randomization of the recrystallization texture were proven by experiments as well as by cellular automaton simulations. During tension of the cold-rolled and annealed material high work-hardenability was observed. We attribute this behavior primarily to the dominance of planar dislocation slip and reduced tendency for dynamic recovery, since deformation twinning was observed to activate only in the non-recrystallized grains and thus, contributed minimally to the overall plasticity. The correlation between deformation/annealing twinning and the material behavior was discussed in detail.

中文翻译：

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变形和退火孪晶对面心立方高熵合金组织和织构演变的影响

研究了变形和退火过程中激活的物理机制对等原子 CoCrFeMnNi 高熵合金 (HEA) 的微观结构和织构演变以及力学性能的影响。冷轧和退火的组合用于研究处于变形、恢复、部分再结晶和完全再结晶状态的 HEA。通过电子背散射衍射、透射电子显微镜和 X 射线衍射进行详细的微观结构和纹理分析。使用单轴拉伸试验评估机械性能。本次调查的重点是研究变形和退火孪晶对材料行为的影响。经证实，在冷轧变形过程中，孪晶促进了从 Cu 型到黄铜型织构的转变，而退火孪晶导致再结晶过程中形成的织构发生强烈改变。实验和元胞自动机模拟证明了特定孪晶取向的形成和再结晶织构的随机化。在冷轧和退火材料的拉伸期间，观察到高加工硬化性。我们将这种行为主要归因于平面位错滑移的主导地位和动态恢复趋势的降低，因为观察到形变孪晶仅在非再结晶晶粒中激活，因此对整体塑性的贡献最小。详细讨论了变形/退火孪晶与材料行为之间的相关性。