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Effect of Stretch Bending on the Microstructure and Mechanical Properties of AZ31 Magnesium Alloy

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Abstract

The stretch-bending straightening is an effective way to improve the accuracy of sheet assembly. The effect of stretch-bending on the microstructure, deformation behavior and mechanical properties of the extruded AZ31 alloy sheet is investigated by experiments and finite element analysis. The grain size decreases with increasing deformation, and the upper surface shows a greater of grain size reduction rate than the lower surface due to the tensile and compressive asymmetry of the sheet in the thickness direction. This stress–strain asymmetry has been demonstrated by finite element analysis. In addition, the pole density centers of the (0001), (10 \(\overline{1 }\) 0), (10 \(\overline{1 }\) 1) and (10 \(\overline{1 }\) 2) textures move reciprocally with the loading and unloading of the lower roll along the extrusion direction. The (0001) texture is significantly enhanced affected by the stress loading direction and the “sticking position” of the (0001) grains. The increase of the basal texture intensity and work hardening causes the yield strength and hardness of the sheet to increase by 49 and 26%, respectively, while the plasticity of the sheet decreases.

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Data available on request from the authors.

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Acknowledgments

The work is supported by National Natural Science Foundation of China (52371095), Chongqing Overseas Chinese Entrepreneurship and Innovation Support Program (cx2023117), Chongqing Natural Science Foundation Innovation and Development Joint Fund (CSTB 2022NS CQ- LZX0054), Innovation research group of universities in Chongqing (CXQT21030), Chongqing Natural Science Foundation (cstc2019jcyj-msxmX0284).

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Authors and Affiliations

  1. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China

    Ruinan Chen, Ao Shen, Na Yang, Gaopeng Zhang, Qinghua Chen, Jian Su & Qingwei Dai

  2. Guangdong High-End Stainless Steel Research Institute Co. Ltd, Yangjiang, 529500, China

    Peng Zhang & Xiaomeng Guo

  3. Shandong Luqiao Group Co., Ltd, Jinan, 250000, China

    Haipeng Song

  4. School of Material and Metallurgy, University of Science and Technology Liaoning, Anshan, 114051, China

    Jian Su

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  1. Ruinan Chen
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Chen, R., Shen, A., Zhang, P. et al. Effect of Stretch Bending on the Microstructure and Mechanical Properties of AZ31 Magnesium Alloy. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09555-8

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