摘要
利用慢应变速率拉伸试验,研究2219铝合金母材及搅拌摩擦焊接头在不同腐蚀介质环境中的应力腐蚀行为.运用性能损失率指标和应力腐蚀指数评价材料的应力腐蚀敏感性.结果表明,应变速率为10-6s-1时,2219铝合金母材和FSW接头在3.5%Na Cl介质环境中SCC敏感性小,断口由韧窝塑性区和腐蚀区组成;在剥蚀介质环境中,母材和FSW接头SCC敏感性大,断口呈冰糖状,有较深的腐蚀坑和二次裂纹,为沿晶脆性断裂.FSW接头SCC敏感性较母材大.
The stress corrosion cracking( SCC) suspectbility of 2219 aluminium alloy and its friction stir weldment in different environmenthas been tested using slow strain rate testing( SSRT). The performance loss rate indicator and stress corrosion cracking index were used to evaluate SCC susceptibility.The SSRT test in 3. 5% NaC l solution at a strain rate of 10-6s-1has shown that the SCC susceptibility of parent metal and weldment were small and the fracture was composed of ductile dimples and corrosion zones. However,the parent metal and the weldment were susceptible to SCC exhibiting intergranular fracture in exfoliation corrosion( EXCO) solution at the same strain rate. The friction stir weldment was more susceptible to SCC than parent metal.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第12期7-10,1,共5页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51105030)
哈尔滨工业大学先进焊接与连接国家重点实验室资助项目(AWPT-M06)
关键词
2219铝合金
搅拌摩擦焊
应力腐蚀指数
慢应变速率拉伸
2219 aluminum alloy
friction stir welding
stress corrosion cracking index
slow strain rate testing
