摘要
本文研究了 2 195Al Li合金的晶间腐蚀和剥蚀行为 ,并通过时效析出相θ′和T1相的模拟合成及其在晶间腐蚀和剥蚀介质中的开路电位测定 ,阐述了时效制度对合金晶间腐蚀和剥蚀行为的影响。研究表明 ,合金的晶间腐蚀和剥蚀主要是由于晶界T1相或 (和 )晶界无沉淀带的腐蚀所造成的 ;随时效时间延长 ,晶界T1相及晶界无沉淀带宽度增加 ,合金晶间腐蚀和剥蚀敏感性增加。
The intergranular corrosion and exfoliation corrosion behaviors of 2195 Al-Li alloy were investigated. The simulated precipitates of θ′(Al 2Cu) and T1(Al 2CuLi) were fabricated, and their open-circuit potentials were measured. The influence of aging treatment on integranular corrosion and exfoliation corrosion was analyzed through the electrochemical behavior of these aging precipitates. It is sugges- ted that intergranular corrosion and exfoliation be caused by the anodic dissolution of T1 phase or the alternant corrosion of T1 and precipitate-free zone (PFZ). T1 phase is augmented and PFZ at grain boundary is broadened with aging time, and the susceptibility to intergranular corrosion and exfoliation is increased.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2004年第5期640-643,共4页
Journal of Materials Science and Engineering
基金
国家"十五"重点科技攻关项目 (No.MKP0 1 1 30 (2D) )
中南大学科研基金资助项目
关键词
2195铝锂合金
晶间腐蚀
剥蚀
2195 Al-Li alloy, Intergranular corrosion, Exfoliation corrosion
