通过偏振光显微镜对连续应力和恒电场作用下的BaTiO3单晶中的裂纹扩展和畴变过程进行原位观察. 结果表明, 在连续应力的作用下, 裂尖处应力集中导致出现畴变带, 裂纹与畴变带垂直相交, 畴带和裂纹一起向前移动, 畴变在先, 裂纹扩展在后; 在恒电场作用下, 畴变引起的不协调应变导致电致裂纹扩展, 畴变始终发生在裂纹扩展之前, 裂纹向前扩展时不断的切过前方的畴带, 直到不再有畴变发生时裂纹停止扩展.
Domain switching and crack propagation in BaTiO3 single crystal under external field were in-situ observed by polarized light microscopy (PLM). It was found that under mechanical field, domain-switching bands appear around the crack tip to relax stress and domain switching occurred before crack propagation. Under electric field, the internal stress induced by domain switching results in crack propagation.
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