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Effect of electromagnetic coupling treatment on the residual stress relief and mechanical properties of 7050 aluminum alloy

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Abstract

Due to the machining-induced residual stress while processing, the machining distortion of thin-walled 7050 aluminum alloy parts occurs easily, which greatly affects the pass rate of the products. Herein, electromagnetic coupling treatment (EMCT) was proposed to relieve the residual stress of 7050 aluminum alloy. It was found that EMCT had a significant effect on residual stress relief (13.3–89.7%). The energy input by EMCT promoted the movement of dislocation, resulting in the uniform distribution of microplastic strain, the release of stored elastic strain energy, and the residual stress relief, ultimately. A numerical simulation method to visualize the evolution of the electromagnetic field, the stress, and the strain in the materials was proposed to explain the causes of microplastic strain. Specimen #5 with the optimal EMCT processing parameter (1.5 T, 1.5 V) was considered to be the most effective for both residual stress relief and mechanical property enhancement, in which the residual stress decreased by 85.1% and the tensile strength increased by 8.3%. In this paper, it is proposed that EMCT can be used as an effective method to reduce the residual stress of 7050 aluminum alloy. Moreover, it has certain technical reference value for the study of residual stress relief of other thin-walled part materials.

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Data availability

Data (images and measurement files) supporting the findings of this study are available from the corresponding author, K. Huang, upon reasonable requests.

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Acknowledgements

The authors wish to acknowledge the financial support by the AVIC Independent Innovation Special Fund Project (Nos. ZZCX-2022-036 and ZZCX-2021-031) and the Sichuan Science and Technology Program (No. 2021ZDZX0002). We would like to appreciate the Analytical and Testing Center of Sichuan University for structural characterization work, and we would be grateful to Yong Liu for her help with SEM analysis.

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Authors and Affiliations

  1. School of Mechanical Engineering, Sichuan University, Chengdu, 610065, Sichuan, People’s Republic of China

    Lila Ashi, Hongfei Sun, Jie Wang & Kunlan Huang

  2. Yibin Industrial Technology Research Institute of Sichuan University, Yibin, 644005, Sichuan, People’s Republic of China

    Lila Ashi, Hongfei Sun, Jie Wang & Kunlan Huang

  3. AECC AERO Science and Technology Co., Ltd, Chengdu, 610503, Sichuan, People’s Republic of China

    Zhiqiang Xie

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  1. Lila Ashi
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Contributions

LA contributed to investigation, data curation, formal analysis, and writing original manuscript. ZX contributed to resources, investigation, conceptualization, experimental design, and formal analysis. HS contributed to investigation, data curation, and numerical simulation and analysis. JW contributed to resources, writing review, and editing manuscript. KH contributed to resources, supervision, validation, writing reviews, and editing.

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Correspondence to Kunlan Huang.

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Ashi, L., Xie, Z., Sun, H. et al. Effect of electromagnetic coupling treatment on the residual stress relief and mechanical properties of 7050 aluminum alloy. J Mater Sci 58, 12097–12117 (2023). https://doi.org/10.1007/s10853-023-08775-y

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