Investigation of Stress Corrosion Cracking Initiation of 7A52 Aluminum Alloy  

作　　者：李奇 

机构地区：[1]Department of Equipment Remanufacture Engineering, Academy of Armored Forces Engineering

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2012年第4期648-651,共4页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China (No. 50801066)

摘　　要：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.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.

关 键 词：7A52 aluminum alloy stress corrosion cracking stress corrosion cracking susceptibility INTERMETALLICS 

分 类 号：TG172.9[金属学及工艺—金属表面处理]