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Influences of expanding angles on extrusion-shearing-expanding processing of AZ31 magnesium alloy thin-walled tubes

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Abstract

To study the influences of expanding angles on extrusion-shearing-expanding (ESE) process of AZ31 magnesium alloy thin-walled tubes, microstructures and mechanical properties of tubes fabricated by ESE process with different expanding angles 130°, 140°, 150°, respectively, have been investigated by an optical microscope (OM) and an X-ray diffractometer (XRD). The load-stroke curves and equivalent strains changing with different expanding ratios of ESE die structures have been simulated by Deform-3D software. The research results showed that the expanding ratios and expanding angles have great influences on forming loads and equivalent strains, and ESE process can refine the grains of AZ31 magnesium alloy thin-walled tubes effectively, and grain sizes decreased with the dropping of expanding angles. When expanding angle is 140° and the temperature is 380°C, and the expanding ratio is 1.6, the comprehensive mechanical properties of the tubes with yield strength 122.3MPa, tensile strength 288.6MPa, and elongation 15.2% are the best. The texture intensities of AZ31 magnesium alloy were decreased due to the strong shearing force and the dynamic recrystallization (DRX) caused by ESE process. The basal plane of most grains have been deflected relative to the extrusion direction (ED) obviously.

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he raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

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Funding

This study received financial support from the General project of National Natural Science Foundation of China (52071042, 51771038), the Chongqing Talent Project (cqyc202003047), and the Chongqing Natural Science Foundation Project (cstc2018jcyjax0249 and cstc2018jcyjax0653).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University of Technology, No.69 HongGuang Road, BaNan town, Chongqing, 400050, People’s Republic of China

    Ye Tian, Hongjun Hu & Pengcheng Liang

  2. National Engineering Research Center for Magnesium Alloys, Chongqing, 400044, China

    Dingfei Zhang

  3. School of Chemistry and Materials, Army Service College, Chongqing, 401311, China

    Zhongwen Ou

Authors
  1. Ye Tian
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  2. Hongjun Hu
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  3. Pengcheng Liang
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  4. Dingfei Zhang
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  5. Zhongwen Ou
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Contributions

• Hongjun Hu is the corresponding author of this paper who wrote the paper.

• Ye Tian did the examples and wrote the article in this paper.

• Pengcheng Liang did the experiments.

• Dingfei Zhang researched the microstructure analyses in this paper.

• Zhongwen OU provided technical guidance.

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Correspondence to Hongjun Hu.

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Tian, Y., Hu, H., Liang, P. et al. Influences of expanding angles on extrusion-shearing-expanding processing of AZ31 magnesium alloy thin-walled tubes. Int J Adv Manuf Technol 118, 751–758 (2022). https://doi.org/10.1007/s00170-021-07898-3

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  • DOI: https://doi.org/10.1007/s00170-021-07898-3

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