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Microstructural Characteristics and Mechanical Properties of Ultrasonic-Assisted Electron Beam Welding Joints of Rare-Earth Magnesium Alloy

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Abstract

The Mg-10Gd-0.4Zr rare-earth magnesium alloy was joined by ultrasonic vibration-assisted electron beam welding for the first time. The microstructures, pore defects, element segregation and mechanical properties of the ultrasonic vibration-assisted electron beam welding Mg-10Gd-0.4Zr joints were studied. The microstructure of the weld zone of the electron beam welded joint was uniform and fine equiaxed grains, and the precipitated Mg2Gd phase was distributed at the grain boundary. The pore defects were eliminated by ultrasonic cavitation and acoustic flow effects. The grain diameter of the fusion zone was further refined by 19.05% by the ultrasonic vibration. The precipitates of Mg3Gd phases continuously distributed at grain boundaries were effectively inhibited, and the solid solution of Gd atoms was promoted by the action of ultrasonic vibration. The tensile strength of the ultrasonic-assisted electron beam welding joints was 255 MPa, 8.1% higher than that of the electron beam welding joints.

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Acknowledgment

This work was supported by National Key Research and Development Program of China (No. 2022YFB3404700), Taishan Scholars Project (No. tsqn202306136), Fundamental Research Funds for the Central Universities (No. HIT.OCEF.2022043) and National Natural Science Foundation of China (No. 52175308).

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Authors and Affiliations

  1. National Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, No. 2, Cultural West Road, Weihai, 264209, Shandong, China

    Debin Song & Ting Wang

  2. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology, Weihai, 264209, China

    Debin Song, Ting Wang & Siyuan Jiang

  3. Shanghai Spaceflight Precision Machinery Institute, Shanghai, 201600, China

    Yaobang Zhao & Duo Zhao

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  1. Debin Song
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  2. Ting Wang
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  5. Duo Zhao
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Correspondence to Ting Wang.

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Song, D., Wang, T., Zhao, Y. et al. Microstructural Characteristics and Mechanical Properties of Ultrasonic-Assisted Electron Beam Welding Joints of Rare-Earth Magnesium Alloy. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09529-w

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