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LEI Yiwen, GU Zhengyang, SUN Ronglu, TANG Ying. Microstructure evolution and thermodynamic analysis of laser claded Al-Si coating on AZ91D Alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(2): 43-46.
Citation: LEI Yiwen, GU Zhengyang, SUN Ronglu, TANG Ying. Microstructure evolution and thermodynamic analysis of laser claded Al-Si coating on AZ91D Alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(2): 43-46.
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Microstructure evolution and thermodynamic analysis of laser claded Al-Si coating on AZ91D Alloy

  • 1.

    School of Mechanical Engineering, Tianjin Polytechnic University, Tianjin 300387, China;Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, Tianjin Polytechnic University, Tianjin 300387, China

  • 2.

    School of Mechanical Engineering, Tianjin Polytechnic University, Tianjin 300387, China

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  • Received Date: July 13, 2013
    Graphical Abstract
    • Abstract
  • Laser cladding was used to prepare Al-Si coating on AZ91D magnesium alloy by using Al-Si eutectic alloy powders. Microstructure of the coatings was analyzed by optical microscope, scanning electronic microscope, energy dispersive spectroscopy and X-ray diffractometer. The phase constitution, composition and transformation in the coating were analyzed with Thermo-Calc software. The results showed that the coating was divided into two layers. In the upper layer, Mg2Si dendrites and fine needle-like Al3Mg2 are uniformly distributed on Al12Mg17 matrix and its crystallization process is liquid→liquid+Mg2Si→ Mg2Si+Al12Mg17→Mg2Si+Al12Mg17+Al3Mg2. The bottom layer consists of Mg2Si particles, α-Mg dendrites and(α-Mg+A12M17) eutectics and its crystallization process is liquid→liquid+Mg2Si→liquid+Mg2Si+α-Mg→Mg2Si+α-Mg+(α-Mg+A12M17) eutectics. The calculated results are well consistent with the experimental data and it is beneficial to understanding the microstructure evolution of laser claded Al-Si coating on AZ91D magnesium alloy.
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    • References (8)
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