晶体表面微观结构的反射电子显微术观察

本文用反射电子显微术观察了球状铂单晶表面的微观结构,分析了单晶形成中内部缺陷的变化。当球状液滴凝固时,晶体中存在位错、小角晶界等缺陷。在其后的退火过程中,晶粒内部的位错向亚晶界运动,降低了晶粒内部的位错密度,而亚晶界中的位错向晶体表面的运动,导致亚晶界的消失,形成单晶。关键词：

OBSERVATIONS OF MICROSTRUCTURES OF CRYSTAL SURFACES BY REFLECTION ELECTRON MICROSCOPY

The surface microstructures of spherical Pt single crystals are studied by reflection electron microscopy, and the defect configurations in the crystals are also analysed. Dislocations and low angle grain boundaries appear in the initial stage of the solidification of liquid drops. In the following annealing, the dislocation density decreases and single crystals are formed owing to the movements of dislocations in the grains to the subgrain boundaries, and those in the subgrain boundaries to the surfaces of crystals.