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Investigation into Atomic Diffusion at the Interface During Extrusion Welding of Magnesium and Magnesium Alloys

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Abstract

This research was aimed to reveal atomic diffusion across the bonding interface through the extrusion-welding experiments of dissimilar materials, namely pure magnesium and Mg–Al–Zn–RE alloy. A special tooling setup used to simulate weld seam formation during extrusion through a porthole die was designed for this model study. To deform the metal streams symmetrically and create a sound weld seam, the extrusion-welding experiments from sandwich-structured billets were carried out. Chemical analysis of diffused atoms in the welding region was performed by electron probe micro-analysis. The results confirmed that atomic diffusion indeed occurred across the interface during extrusion. The gradients in element concentration, local stresses, and hydrostatic pressure were considered to be the necessary conditions for extensive atomic diffusion to occur. Atomic diffusion was significantly enhanced by raising extrusion temperature. The analysis of the stress and hydrostatic pressure distributions in the welding region provided new insights into the mechanisms of weld seam formation during the extrusion of light metals.

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Acknowledgments

The authors greatly appreciate the financial support of the National Natural Science Foundation of China (Project No. 51675300).

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Shengwen Bai & Bin Jiang

  2. State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China

    Shengwen Bai & Gang Fang

  3. Chongqing Academy of Science and Technology, Chongqing, 401123, China

    Bin Jiang

  4. Department of Biomechanical Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands

    Jie Zhou

Authors
  1. Shengwen Bai
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  2. Gang Fang
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Correspondence to Gang Fang.

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Manuscript submitted February 25, 2021; accepted June 29, 2021.

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Bai, S., Fang, G., Jiang, B. et al. Investigation into Atomic Diffusion at the Interface During Extrusion Welding of Magnesium and Magnesium Alloys. Metall Mater Trans A 52, 4222–4233 (2021). https://doi.org/10.1007/s11661-021-06381-8

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