Microstructure development in laser forming of zirconium coatings on AZ91D magnesium alloy substrates |
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| Authors: | T.M. Yue H. XieX. Lin H.O. Yang |
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| Affiliation: | a The Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, Hong Kong Polytechnic University, Hung Hom, Hong Kong
b State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, PR China |
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| Abstract: | Zr-coatings were fabricated on AZ91D magnesium alloy substrates using laser forming by means of a blow powder technique. Multi-passes were required to form a pure Zr top coating layer on the AZ91D Mg substrate. The microstructure and phases of the coating were studied using XRD, EDS and SEM. The alloy element Al in AZ91 alloy was found to be important for the formation of a metallurgically bonded interface between the Zr coating and the matrix material. The coating can be classified as a three-layer structure with a pure Zr layer at the top surface. The development of the coating microstructure is explained with the aid of a schematic solidification scheme. |
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| Keywords: | Laser forming Zirconium Coating Magnesium Solidification Microstructure |
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