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本文研究了氢含量对Al－Li合金2091－T6薄板力学性能、应力腐蚀开裂寿命（SCCL）、变形机制和断口形貌的影响。结果表明，合金的氢含量由0.92μg／g降低到0.08μg／g时，力学性能和SCCL显著提高．变形机制由切割机制转变为绕过机制，拉伸和应力腐蚀试样的断裂模式由典型的沿晶脆性断裂转变为穿晶韧性断裂，氢脆引起的低韧性沿晶断裂特点完全消失.本文还讨论了脱氢对Al-Li合金变形机制和断裂模式影响的机理，提出了“超低氢Al-Li合金”的概念.
In this paper, the effect of hydrogen content on the mechanical properties, SCL, deformation mechanism and fracture morphology of 2091-T6 Al-Li alloy sheet has been investigated. The results show that the mechanical properties and SCCL increase significantly when the hydrogen content of the alloy is reduced from 0.92μg / g to 0.08μg / g. The deformation mechanism changes from a cutting mechanism to a bypass mechanism, and the fracture modes of tensile and stress corrosion specimens change from the typical brittle fracture to transgranular fracture, and the low fracture toughness caused by hydrogen embrittlement disappears completely. The mechanism of dehydrogenation on the deformation mechanism and fracture mode of Al-Li alloy was discussed, and the concept of “ultra-low hydrogen Al-Li alloy” was proposed.