Metallic MaterialsNo Access

Corrosion–fatigue crack propagation of aluminum alloys for high-speed trains

Lin Shen

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China

E-mail Address: prslin@163.com

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Hui Chen

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China

E-mail Address: xnrpt@163.com

Corresponding author.

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Xiaoli Che

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China

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, and

Lidong Xu

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China

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https://doi.org/10.1142/S021797921744009XCited by:9 (Source: Crossref)

Abstract

A modified single-edge notch tension (SENT) specimen exposed to saline environment was utilized to investigate the corrosion–fatigue crack growth behaviors of 5083, 6005 and 7N01 aluminum alloys. The fatigue crack propagation life, corrosion–fatigue crack rate ( $d a / d N$ $d a / d N$ ) were tested. The microstructures and fracture surfaces of specimens were examined by optical microscopy and scanning electron microscopy (SEM). The results showed that fatigue crack propagation rate of 7N01 in 3.5% NaCl was significantly higher than 6005 and 5083 alloys. The mechanisms of anodic dissolution and hydrogen embrittlement are used to explain the results.

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