The restoration of an yttria dispersion strengthened tungsten plate and the corresponding microstructural evolution are investigated through in situ annealing using high-temperature confocal laser scanning microscopy. The geometrically necessary dislocation density and subgrain/grain evolution at each annealing stage are confirmed using the electron backscatter diffraction technique. The microstructure's evolution is divided into distinct stages of recovery, recrystallization, and grain growth based on their characteristic features. During the recovery process, the fomation of subgrains occurs. The primary mechanism of recrystallization nucleation is dominated by the strain-induced boundary migration mechanism, and the subgrains preexisting at grain boundaries are the main nucleation sites.

中文翻译：

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高温共焦激光扫描显微镜原位观察钨板修复体

通过使用高温共焦激光扫描显微镜进行原位退火，研究了氧化钇弥散强化钨板的修复以及相应的微观结构演变。使用电子背散射衍射技术确认每个退火阶段的几何必要位错密度和亚晶/晶粒演化。根据其特征，微观结构的演变分为不同的恢复、再结晶和晶粒生长阶段。在恢复过程中，发生亚晶粒的形成。再结晶形核的主要机制以应变诱导晶界迁移机制为主，晶界处预存的亚晶是主要的形核位点。