摘要
设计了AZ31镁合金的母材(BM)、搅拌摩擦焊接头(FSW)、焊后横向拉伸5%(FSW+T)和焊后拉伸加退火(FSW+T+A)等4组试样。通过对比4组试样在质量分数为3.5%的NaCl溶液中的耐腐蚀性能,探索焊后塑性变形对接头耐腐蚀性能的影响。结果发现,AZ31镁合金的耐腐蚀性能在搅拌摩擦焊接后显著改善,但焊后横向拉伸将显著降低接头的耐腐蚀性能,而拉伸后退火处理使接头耐腐蚀性能增强。4组试样的腐蚀速率由大到小为:BM>FSW+T>FSW≈FSW+T+A。焊后横向拉伸在AZ31镁合金焊接接头中引入拉伸孪晶及位错滑移,两者对接头的耐腐蚀性能产生不利影响,但位错滑移所起的作用更显著。
Four groups of samples,including base metal(BM),FSW,FSW+T and FSW+T+A samples,were designed to investigate the effects of plastic deformation on the corrosion resistance of the joints immersed in 3.5%NaCl solution.The results reveal that the corrosion resistance of AZ31 magnesium alloy can be enhanced significantly by friction stir welding,while post-welded tension can weaken significantly the corrosion resistance of the joint,however post-annealing treatment can enhance largely the corrosion resistance.Corrosion rate of the four groups of samples is presented as follows:BM>FSW+T>FSW≈FSW+T+A.In addition,both extension twinning and dislocation slip introduced by post-welded tension have an adverse effect on the corrosion resistance of the joint,in which dislocation slip plays the key role.
作者
姜超
冯蕾
苏蓓蓓
王向杰
Jiang Chao;Feng Lei;Su Beibei;Wang Xiangjie(Department of Electromechanical Engineering,Hubei Polytechnic University;Department of Traffic Engineering,Hubei Engineering Institute)
出处
《特种铸造及有色合金》
CAS
北大核心
2020年第2期135-139,共5页
Special Casting & Nonferrous Alloys
基金
湖北省教育厅科学技术研究资助项目(Q20184503)。
关键词
搅拌摩擦焊接
镁合金
耐腐蚀性能
位错滑移
Friction Stir Welding
Magnesium Alloy
Corrosion Resistance
Dislocation Slip
