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.
Effect of hydrogen content on the mechanical properties, stress-corrosion cracking life (SCCL), deformation mechanism and fracture mode in the 2091-T6 al-Li alloy sheet has been studied systematically. The experimental results show that as the H content in the alloy is lowered from 0.92μg / g to 0.08μg / g, the mechanical properties of σb,σ0.2 and δ,and SCCL are increased significantly. The deformation mechanism is also changed from the mode of dislocation shearing δ' phase to the Orowan looping mode, and the fracture appearance of tensile and stress-corrosion specimens is changed from typical intergranular brittle fracture to transgranular ductile fracture, the characteristic of low toughness fracture induced by hydrogen embrittlement disappeared completely The mechanism of the effect of dehydrogenation on the deformation and fracture mode in al-Li alloy is also discussed, and the concept of "Extra Low Hydrogen al-Li alloy" is proDosed in the present paper.
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