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Abstract: Surface alloying of magnesium surface was conducted by GTAW using AlMg4.5Mn wire as the alloying material. The microstructure of the resulting surface layer comprised dendrites of the solid solution of aluminium in magnesium and a eutectic structure occurring in the interdendritic areas. The eutectic contained an Mg17Al12 intermetallic phase and a solid solution of aluminium in magnesium. At the interface between the layer and the substrate, a thin zone of the solid solution of aluminium in magnesium was observed. The microhardness of the modified surface was more than twice as high as that of the substrate.
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