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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Effect of pre-strain on fatigue crack growth of 2E12 aluminum alloy
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Non-Ferrous Metals, Material Science and engineering,
Ministry of E

Abstract:The influences of pre-strain on the mechanical property and fatigue crack growth of 2E12 aluminum alloy were evaluated by SEM, TEM, mechanical property and fatigue tests. The axial fatigue tests were conducted under a constant amplitude sinusoidal wave loading at stress ratio of 0.1 in laboratory air and salt fog at room temperature. The results show that the yield stress of pre strain material is higher than that of the material without undergoing pre-strain, but pre-strain can not make the increase of the growth rate of fatigue crack. Fatigue crack growth rates of the alloy in salt fog are higher than those in air. The increased fatigue crack growth of the alloy in a given environment and more brittle striations can be observed in salt fog.

 

Key words: 2E12 aluminum alloy; pre-strain; fatigue crack growth; salt fog

ISSN 1672-7029
CN 43-1423/U

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