Investigation of stress corrosion cracking initiation of 7A52 aluminum alloy |
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Authors: | Qi Li Junjun Zhao Ping Zhang |
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Affiliation: | 1. Department of Equipment Remanufacture Engineering, Academy of Armored Forces Engineering, Beijing, 100072, China
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Abstract: | The stress corrosion cracking(SCC) behaviour of 7A52 aluminum alloy in air and in 3.5% NaCl solution was researched by slow strain rate test(SSRT) and SEM-EDS. The SCC susceptibility was estimated with the loss of the reduction in area. The experimental results indicate that the SCC susceptibility of 7A52 aluminum alloy in 3.5% chloride solution is the highest at strain rate of 1×10?6 s?1. The lowest one is under the condition of 1×10?5 s?1. Stress concentration and anode dissolving around Al-Fe-Mn intermetallics initiate micropores which will result in microcracks. The existence of intermetallics in the microstructure may play an important role in understanding the SCC initiation mechanisms of 7A52 aluminum alloy. |
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