利用恒位移加载台，在TEM中原位观察了Fe3Al薄膜试样充氢和应力腐蚀前后裂尖位错组态的变化，以及位错对裂纹形核的影响．结果表明，氢能促进裂尖发射位错，促进位错的增殖和运动，并使无位错区增大．当位错发射、运动发展到临界状态时，就会导致氢致裂纹的形核与扩展．对氢促进位错发射、增殖和运动的原因进行了探讨 In the TEM, the dislocation configurations of Fe3Al thin films before and after hydrogen charging and stress corrosion were observed by TEM, and the effect of dislocation on the nucleation of the cracks was observed. The results show that hydrogen promotes dislocation at the crack tip, promotes dislocation proliferation and motility, and increases dislocation-free region. When the dislocation is launched and the movement reaches a critical state, the nucleation and expansion of hydrogen induced cracks will be caused. The reasons why hydrogen promoted dislocation emission, proliferation and movement were discussed