Eutectic Growth in Laser Cladding of Zr-Coating on AZ91D Magnesium Substrate

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  • Yue T. M.
    Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University
  • Xie H.
    Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University
  • Lin X.
    Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University
  • Yang H. O.
    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University

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Zr-bearing coatings were fabricated on an AZ91D magnesium substrate by means of a two-step method. First, pure zirconium powder was plasma sprayed on the substrate and, subsequently, laser cladding was performed on top of the spray deposited layer. The process led to the formation of a zirconium coating containing zirconia. The coating comprises three layers; on top of the substrate is the plasma sprayed layer, followed by the laser re-melt layer and finally an outermost laser-clad layer. The microstructure and phase of the coating were studied. The results show that rapid solidification occurred in the laser-clad layer and resulted in a directional eutectic cellular and eutectic dendrite growth of (Zr) + ZrO2. The maximum velocity for co-operative lamellar growth of the (Zr) + ZrO2 eutectic and its corresponding lamellae spacing were calculated based on the TMK model.

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