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Low cycle fatigue behavior and mechanism of Al-3.5Si-0.5Mg-0.4Cu
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  • Qiaosheng Shen,
  • Yushu Hu,
  • Guotong Zou,
  • Henghua Zhang,
  • Yitao Yang
Qiaosheng Shen
Shanghai University

Corresponding Author:[email protected]

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Yushu Hu
Shanghai University
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Guotong Zou
Central South University Railway Campus
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Henghua Zhang
Shanghai University
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Yitao Yang
Shanghai University
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Abstract

In this article, the low cycle fatigue(LCF) behavior of a low silicon cast aluminum alloy Al-3.5Si-0.5Mg-0.4Cu with T6 treat-state at room temperature is investigated by extracting samples from aluminum steering knuckles. Initial microstructure, cyclic stress response behavior and fatigue fracture are studied. Low cycle fatigue experiment results and behavior performance of 6 different total strain amplitudes are included. OM, SEM, XRD and TEM are carried out to observe pre(post)-fatigue microstructures and fracture. The results demonstrate that cracks initiate from surface or subsurface defects and higher total strain amplitude leads to larger sum area of fatigue crack initiation region and steady crack propagation region, and wider fatigue striation bandwidth. Furthermore, crack propagates along the interface between eutectic silicon and α-Al under low strain amplitude while crack grows through eutectic silicon particle if higher strain amplitude is applied.
28 Feb 2022Submitted to Fatigue & Fracture of Engineering Materials & Structures
28 Feb 2022Submission Checks Completed
28 Feb 2022Assigned to Editor
05 Mar 2022Reviewer(s) Assigned
09 Apr 2022Review(s) Completed, Editorial Evaluation Pending
18 Apr 2022Editorial Decision: Revise Major