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在透射电子显微镜(TEM)中原位观察了Al单晶吸附Hg原子后加载裂纹前方位错组态的变化以及微裂纹的形核过程.结果表明:液体金属吸附后能促进位错的发射、增殖和运动;当它发展到临界条件时就会导致脆性微裂纹的形核.即在液体金属环境中,脆性裂纹形核是以位错的发射和运动为先决条件.
In situ transmission electron microscopy (TEM) was used to observe the change of dislocation configuration and the nucleation process of microcracks after Hg atoms were adsorbed on Al single crystal in situ.The results showed that the liquid metal promoted the dislocation emission and proliferation And movement; when it reaches critical conditions, it will result in the nucleation of brittle microcracks, that is, in the liquid metal environment, the nucleation of brittle cracks is based on the dislocation emission and movement as the prerequisite.