Abstract
Abstract Microstructural evolutions, hardness and thermal behavior of Al 12 Mg 17 complex metallic alloy (CMA) were studied before and after homogenizing annealing. This heat treatment was conducted on the as-cast alloy at high temperature of 400 °C in different times in order to clarify the mechanism and also determining the optimum annealing time for achieving a single phase intermetallic compound. The as-cast microstructures involve γ-Al 12 Mg 17 and small amount of Mg-rich microsegregated phase which forms during eutectic solidification. Phase and microstructural evolutions during homogenization were comprehensively investigated by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction patterns (XRD). The thermal behavior and hardness of the as-cast and homogenized intermetallics have been investigated by differential scanning calorimetry (DSC) and Vickers microhardness measurements, respectively. The results of these investigations indicated that homogenization treatment resulted in a diffusion of Mg from Mg-rich domains in eutectic structure to the intermetallic matrix, leading to evolution and dissolution of second phase along with the formation of Kirkendall porosities according to proposed mechanism. Finally a single phase of Al 12 Mg 17 CMA with higher lattice parameter, hardness and melting point formed after 32 h of homogenizing annealing heat treatment.
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