Effect of aging time on microstructure evolution and corrosion behavior of an Al-Mg-Si alloy

被引:3
作者
Zheng, Yaya [1 ]
Luo, Binghui [1 ]
He, Chuan [1 ]
Su, Yuelan [1 ]
机构
[1] Cent S Univ, Coll Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
来源
MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 11期
关键词
Al-Mg-Si; corrosion behavior; microstructure evolution; aging; ALUMINUM-ALLOYS; PRECIPITATION; RESISTANCE; PATHWAYS; STRENGTH; RATIO;
D O I
10.1088/2053-1591/ab4bec
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This investigation aims at assessing the microstructural features and associated corrosion behavior of a specific type of Al-Mg-Si alloy with various heat-treatment conditions: underaging (T4), peakaging (T6), overaging (T7). The results show that the alloy exhibits localized corrosion in T4 temper. T6 sample exhibits the heaviest intergranular corrosion (IGC), T7 sample exhibits combined corrosion form of IGC and pitting corrosion. The microstructural changes in the size and distribution of the grain boundary precipitates are the main reasons of the transformation of the corrosion form. The pitting corrosion in the underaged condition is associated with the preferential dissolution of MgSi and the anodic dissolution of the solute-depleted zones (SDZs). The heavy IGC susceptibility in T6 temper results from the closely-neighbored grain boundary precipitates and precipitation free zones (PFZs). Coarse precipitates in the grain boundaries with discontinuous distribution and the reduction of composition difference between matrix and PFZ improve the IGC resistance.
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页数:7
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