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本文研究了氢含量对 Ａｌ－Ｌｉ合金８０９１－Ｔ６薄板光滑试样疲劳寿命（Ｎｆ）、变形机制和断裂模式的影响结果表明，合金的氢含量由１．０４３降低到 ０．０５３ μｇ／ｇ，变成超低氢合金， Ｎｆ提高约一倍，疲劳变形机制由切割机制转变为绕过机制，断裂模式由以穿晶脆性断裂为主转变为穿晶韧性断裂，由氢脆引起的低韧性断裂特点完全消失本文还简要地讨论了氢含量变化造成疲劳变形机制和断裂模式转变的原因．
The effect of hydrogen content on the fatigue life (Nf), deformation mechanism and fracture mode of Al-Li alloy 8091-T6 thin plate has been studied. The results show that the hydrogen content of alloy decreases from 1.043 to 0.053 μg / g, Into ultra-low hydrogen alloys, Nf increased about double, the fatigue deformation mechanism from the cutting mechanism into a bypass mechanism, the fracture mode by transgranular brittle fracture into transgranular ductile fracture, hydrogen embrittlement caused by low ductile fracture Features disappear completely This article also briefly discusses the reasons for the changes in hydrogen content caused by fatigue deformation mechanism and fracture mode change.