焊后塑性变形对搅拌摩擦焊AZ31镁合金耐腐蚀的影响

姜超; 冯蕾; 苏蓓蓓; 王向杰

doi:10.15980/j.tzzz.2020.02.004

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焊后塑性变形对搅拌摩擦焊AZ31镁合金耐腐蚀的影响
Effects of Plastic Deformation after Welding on Corrosion Resistance of Friction Stir Welded AZ31 Magnesium Alloy
2020年40卷第2期页码：135-139
纸质出版日期： 2020 ，
DOI： 10.15980/j.tzzz.2020.02.004

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[1]姜超,冯蕾,苏蓓蓓,王向杰.焊后塑性变形对搅拌摩擦焊AZ31镁合金耐腐蚀的影响[J].特种铸造及有色合金,2020,40(02):135-139.

Jiang Chao, Feng Lei, Su Beibei, et al. Effects of Plastic Deformation after Welding on Corrosion Resistance of Friction Stir Welded AZ31 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2020,40(2):135-139.
[1]姜超,冯蕾,苏蓓蓓,王向杰.焊后塑性变形对搅拌摩擦焊AZ31镁合金耐腐蚀的影响[J].特种铸造及有色合金,2020,40(02):135-139. DOI： 10.15980/j.tzzz.2020.02.004.

Jiang Chao, Feng Lei, Su Beibei, et al. Effects of Plastic Deformation after Welding on Corrosion Resistance of Friction Stir Welded AZ31 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2020,40(2):135-139. DOI： 10.15980/j.tzzz.2020.02.004.

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。

Abstract

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.