Abstract In the present study, the influence of precipitate distribution on the corrosion behaviour of 2A97-T6 Al-Cu-Li alloy in 3.5 wt.% NaCl solution is investigated. It is found that localized plastic strain introduced to the alloy during sheet fabrication leads to the formation of dense T1 (Al2CuLi) phase precipitate bands and precipitate-free bands within selected grains during aging. Preferential dissolution of T1 phase in the dense precipitate bands results in intragranular corrosion in the alloy, in the form of corrosion bands. Further, the dissolution of the alloy matrix propagates in the form of crystallographic corrosion pit.

中文翻译：

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2A97-T6 Al-Cu-Li合金腐蚀行为：不均匀沉淀的影响

摘要 在本研究中，研究了析出物分布对2A97-T6 Al-Cu-Li合金在3.5 wt.% NaCl溶液中腐蚀行为的影响。发现在板材制造过程中引入合金的局部塑性应变导致在时效过程中在选定晶粒内形成致密的 T1 (Al2CuLi) 相沉淀带和无沉淀带。T1 相在致密沉淀带中的优先溶解导致合金中的晶内腐蚀，以腐蚀带的形式出现。此外，合金基体的溶解以晶体腐蚀坑的形式传播。