Corrosion mechanism and fatigue behavior of aluminum alloy with high silicon content

被引：8
作者：
Shui, Youfu [1 ]
Liu, Jinxiang [1 ]
Huang, Weiqing [1 ]
Zhao, Nuo [2 ]
Ren, Peirong [1 ]
Zhao, Chengzhang [1 ]
机构：
[1] Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China
[2] China Shipbuilding Informat Ctr, Beijing 100101, Peoples R China
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2023年 / 296卷
关键词：
Al-8Si alloy; Pitting corrosion; Intergranular corrosion; Dislocation energy; Corrosion fatigue; INTERGRANULAR CORROSION; SI ALLOYS; AL; MICROSTRUCTURE; PRECIPITATION; LONG; ROOM;
D O I：
10.1016/j.matchemphys.2022.127211
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The corrosion and corrosion-assisted fatigue life degradation behaviors of Al-8Si alloy is investigated. The test results show that galvanic cells are formed in the inter-dendrites due to high Si concentration, leading to pitting corrosion. The Al2Cu phase and the Si-rich phase precipitate at the grain boundaries in the inter-dendrites, among which the Al2Cu phase is the most critical factor leading to intergranular corrosion. Subsequently, intergranular corrosion gradually develops into intragranular corrosion attributed to the higher dislocation energy in fine-grained Al grains. Additionally, it is found by comparing the corrosion potential and corrosion rate that high Si concentration would cause the decrease in corrosion resistance. Finally, the fatigue test results show that the corrosion could reduce fatigue life of Al-8Si alloy by 79.77% on average. Therefore, the corrosion -induced fatigue life degradation is very worth to be considered in structures.
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页数：10
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