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Abstract
In this study, liquid-phase surface alloying of AZ31 magnesium alloy was conducted by tungsten inert gas (TIG) melting of preplaced ferrosilicon powder. The effects of TIG processing parameters on the formation of a defect-free surface-alloyed layer were investigated. Microstructures of alloyed layers were studied by optical and energy dispersive spectroscopy-enabled scanning electron microscopy. The phases in the resolidified layer were identified by X-ray diffraction analysis coupled with microhardness. The surface hardness increased from 65 HV0.3 for AZ31 magnesium alloy to as high as 330 HV0.3 for alloyed sample due to the formation of Mg2Si and FeSi intermetallic compounds in the alloyed region and structural refinement.