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Effect of Welding Conditions on Microstructure and Mechanical Properties of Friction Stir Welded AZ31 Mg Alloy Joints

  • Influence of Processing on Microstructure and Properties of Mg Alloys
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Abstract

Friction stir welded (FSWed) AZ31 Mg alloy joints were prepared at two different rotation speeds, namely, 150 rpm and 500 rpm, and are referred to as FSW-150 and FSW-500, respectively. The microstructure of the FSW joints was characterized and the local strain evolution in the tensile tests was monitored by a high-resolution digital image correlation method. The results show that the stir zone (SZ) of both FSW joints showed an equiaxed grain structure and the thermal-mechanically affected zone (TMAZ) had a gradually varied texture in FSW-150, compared with the relatively stable texture in FSW-500. A basin-shaped SZ was formed in FSW-150, while a cylindrical-shaped SZ was formed in FSW-500. Due to the different shape of SZ, the strain was gradually increased in TMAZ through the thickness of the FSW-500 specimen in tensile tests. However, the FSW-150 specimen showed an inhomogeneous strain distribution through the thickness, which resulted in the shear tensile stress to be localized at the TMAZ/SZ boundary and early fracture of the tensile specimen. Finally, the FSW-500 specimen showed an improved tensile strength and elongation of 250 MPa and 17%, compared with the 210 MPa and 6% for the FSW-150 counterpart.

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The raw/processed data required to reproduce these findings cannot be shared at this time due to technical or time limitations.

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Acknowledgements

The authors are grateful for the financial support of the Henan provincial Joint Found of the National Natural Science Foundation of China (U2004170) and Natural Science Foundation of Henan Province (202300410474).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China

    Lin Zhang, Zanyang Zhang, Lele Huang, Yufeng Sun & Shaokang Guan

  2. Henan Key Laboratory of Advanced Magnesium Alloys, Zhengzhou, 450002, China

    Lihong Wu, Yufeng Sun & Shaokang Guan

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  1. Lin Zhang
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  2. Zanyang Zhang
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  3. Lele Huang
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  4. Lihong Wu
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Correspondence to Lihong Wu or Yufeng Sun.

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Zhang, L., Zhang, Z., Huang, L. et al. Effect of Welding Conditions on Microstructure and Mechanical Properties of Friction Stir Welded AZ31 Mg Alloy Joints. JOM 75, 2374–2384 (2023). https://doi.org/10.1007/s11837-023-05833-3

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  • DOI: https://doi.org/10.1007/s11837-023-05833-3

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