from the conferences organized by TANGER Ltd. provisional website
Surface layers enriched with Al and Si were fabricated on an AZ91D substrate using thermochemical treatment in solid media. The AZ91D specimens were heated in an Al+Si powder mixture acting as a source of diffusion elements. Two temperatures were applied: 430 oC and 445 oC. The microstructural characterization of the layers was performed using an optical microscope and a scanning electron microscope equipped with an energy-dispersive X-ray spectrometer (EDS). The layer produced at 430 oC had a thickness of 50 µm; the structure was composed of intermetallic Mg17Al12 and Al3Mg2 phases and an Mg2Si phase. When a higher temperature (445 oC) was used, the layer was much thicker (600 µm) and the structure was predominantly a eutectic (an Mg17Al12 intermetallic phase + a solid solution of Al in Mg) with agglomerates of Mg2Si phase particles distributed over the eutectic matrix.Keywords: Magnesium alloy, thermochemical treatment, diffusion, surface layer, microstructure
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