The effects of thermal annealing on the evolution of vacancy-type defects and Cr segregation in deformed CoCrFeMnNi alloys were investigated using positron annihilation spectroscopy (PAS) and scanning electron microscopy with energy dispersive spectroscopy. On microstructure observation, Cr atoms tended to segregate at the grain boundaries in the CoCrFeMnNi alloy after severe plastic deformation, and after thermal annealing, the size of the Cr segregation phase gradually decreased in the range of 300–800 K, eventually dissolving in the matrix at 1300 K. Positron annihilation spectroscopy results showed that divacancy defects were formed in the deformed samples, indicating that the movement of excess vacancies caused by deformation at room temperature increases the diffusion of Cr atoms and causes Cr segregation. The quenched alloy was annealed at 600–800 K to form vacancy clusters, and with an increase in temperature, the vacancies gradually recovered and were completed at approximately 1300 K.

使用正电子湮没光谱 (PAS) 和具有能量色散光谱的扫描电子显微镜研究了热退火对变形 CoCrFeMnNi 合金中空位型缺陷和 Cr 偏析的影响。显微组织观察发现，CoCrFeMnNi合金在剧烈塑性变形后Cr原子倾向于在晶界偏析，热退火后Cr偏析相尺寸在300~800 K范围内逐渐减小，最终溶解在基体中在1300 K。正电子湮没光谱结果表明，变形样品中形成了双空位缺陷，表明室温下变形引起的多余空位的移动增加了Cr原子的扩散并导致Cr偏析。