Microstructure of fly ash cenosphere/AZ91D composite during solution treatment at 380-420℃

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The fly ash cenosphere/AZ91D(FAC/AZ91D)composites containing 5 wt.% and 100 Nm in size of fly-ash cenosphere particles were fabricated by means of the compcasting method. The microstructures of the as-cast samples and the effect of the solution treatment at 3800C, 4000C, and 4200C for 16 h on the microstructures of the samples were investigated by using of OM, SEM, XRD and EDS. The results showed that the cenospheres distributed homogeneously in the Mg alloy, and were almost filled with Mg alloy. The main interfacial phase between the cenospheres and AZ91 D Mg alloy was identified as MgA1204 according to XRD, EDS and thermodynamic analysis. Mg2Si particles tended to be spheroidized via the solution treatment and theβphase (Mg1,A112)dissolved completely at 400℃.
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