Microstructure, microhardness and corrosion susceptibility of friction stir welded AlMgSiCu alloy

被引：33
作者：
Dong, Peng [1 ]
Sun, Daqian [1 ]
Wang, Bing [1 ]
Zhang, Yueying [1 ]
Li, Hongmei [1 ]
机构：
[1] Jilin Univ, Sch Mat Sci & Engn, Key Lab Automobile Mat, Minist Educ, Changchun 130025, Peoples R China
来源：
MATERIALS & DESIGN | 2014年 / 54卷
关键词：
Friction stir welding; Aluminium alloy; Intergranular corrosion; Precipitation; MG-SI ALLOYS; 6005A-T6; ALUMINUM-ALLOY; INTERGRANULAR CORROSION; MECHANICAL-PROPERTIES; COPPER CONTENT; WELDING PARAMETERS; BEHAVIOR; PRECIPITATION; AL; EVOLUTION;
D O I：
10.1016/j.matdes.2013.09.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microstructure, microhardness and corrosion susceptibility of friction stir welded joint in an AlMgSiCu alloy were investigated. It was found that the joint exhibits different corrosion susceptibility among the microstructural zones. The base material is the most susceptible to intergranular corrosion because of the presence of continuous cathodic precipitates (Si and Q phases) at grain boundaries and the precipitate free zone along the grain boundaries. The coarsening of intergranular precipitates and the precipitation of Q' phases in the grain bodies reduce intergranular corrosion susceptibility but introduce pitting corrosion in the heat-affected zone. The significant elimination of intergranular corrosion both in nugget zone and thermo-mechanically affected zone is related to the low volume fraction of intergranular precipitate. Microhardness variations depend on the evolution of intragranular precipitates. The dissolution and/or coarsening of the strengthening precipitates result in the softening within the welded zone. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：760 / 765
页数：6
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