预温变形对2O91　Al－Li－Cu－Mg－Zr合金应力腐蚀敏感性的影响

THE EFFECT OF WARM-ROLLING POOR TO AGING ON STRESS CORROSION CRACKING SUSCEPTIBILITY OF ALUMINIUM ALLOY 2O91

用慢应变速率拉伸试验和三点弯曲恒应变试验研究不同温度下预轧制变形对２０９１合金应力腐蚀敏感性的影响．透射电镜显微组织分析表明，温轧预变形处理可减少晶界上Ｔ２相的数量，增加晶内沉淀相（σ＇和Ｓ＇相）的体积分数，使合金对应力腐蚀的抗力得到明显提高．经１８０℃温轧预变形处理的合金具有最低的应力腐蚀敏感性．

The influence of warm-rolling at different temperatures prior to aging on the stress corrosion cracking sareptibility of Al-Li-Cu-Mg-Zr alloy 2091 has been studied by slow strain rate tests and constant strain tests with threepoiot loading samples. The examination of microstructure of the alloy by TEM shows that warm-rolling prior tO aging reduces the amount of T2 precipitates and enhances the volume of δ' and S' phare within grains. As a result, the SCC resistance of the alloy is sipecatly improved. The alloy rorolled at 180℃ prior to aging possesses the lowest SCC susceptibility.