摘要
The stress corrosion sensitivity of 7A52 aluminum alloy was investigated in the artificial sea water through slow stain rate test(SSRT). The stress corrosion cracking(SCC) susceptibility was estimated with the loss of elongation and stress corrosion sensitivity index. The results show that the susceptibility of 7A52 aluminum alloy is always high when the strain rate is in the range of 10-5-10-7s-1.It reaches the maximum at the strain rate of 8.7×10-7s-1,and the sensitivity index reaches 0.346. The characteristics of stress corrosion can be observed clearly on the fracture of tensile specimen. The process of SCC is depicted according to the fracture morphology. The SCC initiates at the edge of the specimen. Then the SCC grows rapidly because of the anode dissolving and stress concentration. When the area of specimen cannot support the tensile stress, it ruptures suddenly. The secondary cracks and quasi-cleavage surface can be found on the fracture morphology.
The stress corrosion sensitivity of 7A52 aluminum alloy was investigated in the artificial sea water through slow stain rate test(SSRT). The stress corrosion cracking(SCC) susceptibility was estimated with the loss of elongation and stress corrosion sensitivity index, The results show that the susceptibility of 7A52 aluminum alloy is always high when the strain rate is in the range of 10^-5-10^-7s^-1. It reaches the maximum at the strain rate of 8.7 × 10^-7s^-1, and the sensitivity index reaches 0.346. The characteristics of stress corrosion can be observed clearly on the fracture of tensile specimen. The process of SCC is depicted according to the fracture morphology. The SCC initiates at the edge of the specimen. Then the SCC grows rapidly because of the anode dissolving and stress concentration. When the area of specimen cannot support the tensile stress, it ruptures suddenly. The secondary cracks and quasi-cleavage surface can be found on the fracture morphology.
出处
《中国有色金属学会会刊:英文版》
CSCD
2006年第A03期1523-1527,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(404010202.3C) supported by the Tenth Five-year Plan Program of China
关键词
金属腐蚀
应力腐蚀
铝合金
强度
7A52 aluminum alloy
stress corrosion cracking(SCC)
stress corrosion susceptibility