Based on the theory of fracture mechanics, a hydrogen brittleness model of microcrystalline Al materials is proposed by using the distributed dislocation method. The distinguishing feature of this study is that the model can be used to clarify the dependence of hydrogen atoms at different positions and different numbers of hydrogen atoms on dislocation emission in the initial stage of corrosion fracture. At the same time, the mechanism of crack nucleation at the grain boundary in the hydrogen environment is studied. The results indicate that hydrogen can facilitate the emission, proliferation and motion of dislocations at the crack tip, and increase the accumulation energy of dislocations at the grain boundary, making it easier to generate micro-cracks. In the corrosive environment with hydrogen, a large number of hydrogen atom segregation at the grain boundary reduces the surface energy, and cracks are more likely to occur, and the length of microcracks is longer than that in the absence of hydrogen. These studies are helpful to deepen the understanding of the hydrogen embrittlement of materials.

基于断裂力学理论，采用分布位错法提出了微晶铝材料的氢脆性模型。本研究的显着特点是，该模型可用于阐明腐蚀断裂初期不同位置和不同数量的氢原子对位错发射的依赖性。同时，研究了氢环境下晶界裂纹形核的机理。结果表明，氢能促进裂纹尖端位错的发射、扩散和运动，增加位错在晶界的积累能，使微裂纹更容易产生。在有氢气的腐蚀环境中，晶界处大量的氢原子偏析降低了表面能，更容易产生裂纹，微裂纹的长度比没有氢时长。这些研究有助于加深对材料氢脆性的认识。