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通过光学显微镜观察、透射电镜分析和慢应变速率拉伸试验,研究了2099铝锂合金在不同时效条件下的晶间腐蚀行为、剥落腐蚀行为、应力腐蚀行为和微观组织。结果表明:随着时效时间的延长,合金的耐腐蚀性能得到改善。在欠时效条件下,晶界上残余AlCuFeMn相的存在,导致合金耐腐蚀性能较差;峰时效条件下,大量T1相在基体的均匀析出,改善了合金的耐腐蚀性能;在过时效条件下,大量T1相保持峰时效状态的形貌特征,晶界析出相呈粗大不连续分布,从而使合金的耐腐蚀性能进一步提高。
The intergranular corrosion behavior, exfoliation corrosion behavior, stress corrosion behavior and microstructure of 2099 Al-Li alloy under different aging conditions were studied by optical microscopy, transmission electron microscopy and slow strain rate tensile test. The results show that with the aging time, the corrosion resistance of the alloy can be improved. Under the condition of under aging, the existence of residual AlCuFeMn phase in the grain boundary leads to the poor corrosion resistance of the alloy. Under the condition of peak aging, a large amount of T1 phase precipitates uniformly in the matrix, which improves the corrosion resistance of the alloy. , A large number of T1 phase to maintain the characteristics of peak aging state, grain boundary precipitates were coarse discontinuous distribution, so that the corrosion resistance of the alloy to further improve.