Fatigue properties and crack growth behavior of 7N01 and 6N01 aluminum alloys

Minjin Jiang; Rui Liu; Hongliang Sun; Xiaosong Jiang; Song Chen

doi:10.1515/mt-2021-2042

Article

Fatigue properties and crack growth behavior of 7N01 and 6N01 aluminum alloys

Minjin Jiang
Minjin Jiang, born in 1998, graduated in Materials Science and Engineering at Panzhihua University, PanZhiHua, China in 2019. He is a Master of Science student in Materials Science and Engineering at Southwest Jiaotong University and doing research on powder metallurgy.
, Rui Liu
Rui Liu, born in 1998, graduated in Materials Science and Engineering at Panzhihua University, PanZhiHua, China in 2020. He is a Master of Science student in Materials Science and Engineering at Southwest Jiaotong University and doing research on powder metallurgy.
, Hongliang Sun , Xiaosong Jiang and Song Chen

Published/Copyright: March 16, 2022

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From the journal Materials Testing Volume 64 Issue 3

Abstract

In this study, the fatigue properties, microstructure, and surface damage tolerance of the 6N01 profile, 7N01 profile, and 7N01 plate aluminum alloy were studied. The fatigue test results show that the fatigue limit of the 7N01 profile was the highest and the 7N01 plate was the lowest. More importantly, most fatigue specimens failed in the safe life area provided by the Kitagawa–Takahashi line diagram, which indicates that there is a “short-notch effect” in the fatigue behavior of the pre-cracked aluminum alloys. For the sake of safety, according to the Kitagawa–Takahashi line diagram corrected by the fatigue test results, the effective harmless notch sizes a_0,eff of 6N01 profile, 7N01 profile, 7N01 plate is 23.92, 10.81, 24.32 μm, respectively, and their effective fatigue notch propagation threshold Δk_eff,th is 0.81, 0.39, 0.77 MPa m^1/2, respectively. These corrected values reestablished the fatigue tolerance of the three materials and provided the critical data reference for the practical application. Combined with this study and the analysis of the literature, it can be concluded that the short-notch effect of the three materials should be related to the microstructure, crack closure mechanism, internal defects.

Keywords: aluminum alloy; fatigue strength; fatigue tolerance; Kitagawa–Takahashi diagram; short-notch effect

Corresponding author: Hongliang Sun, Department of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan, China, E-mail: sunhlcd@163.com

Funding source: Southwest Jiaotong University

Award Identifier / Grant number: XJ2021KJZK041

About the authors

Minjin Jiang

Minjin Jiang, born in 1998, graduated in Materials Science and Engineering at Panzhihua University, PanZhiHua, China in 2019. He is a Master of Science student in Materials Science and Engineering at Southwest Jiaotong University and doing research on powder metallurgy.

Rui Liu

Rui Liu, born in 1998, graduated in Materials Science and Engineering at Panzhihua University, PanZhiHua, China in 2020. He is a Master of Science student in Materials Science and Engineering at Southwest Jiaotong University and doing research on powder metallurgy.

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This work was supported by the cultivation project for original scientific research instruments and equipments of Southwest Jiaotong University [grant numbers XJ2021KJZK041].
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Published Online: 2022-03-16

Published in Print: 2022-03-28

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https://doi.org/10.1515/mt-2021-2042

Keywords for this article

aluminum alloy; fatigue strength; fatigue tolerance; Kitagawa–Takahashi diagram; short-notch effect