Abstract
The aging behavior of SiC whisker reinforced AZ91 magnesium matrix composites was investigated with Vickers hardness measurement, differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The precipitation process observed in the monolithic alloy was not altered by the addition of SiC whiskers. The composite exhibited an accelerated hardening response compared with the unreinforced matrix alloy. However, the addition of SiC whiskers altered the distribution of the Mg 17Al 12 precipitates. Mg 17Al 12 precipitated preferentially at the SiCw–AZ91 interface, with a definite orientation relationship with SiC whisker: (1̄10) Mg17Al12//(111) SiCw, [111] Mg17Al12//[01 1 ̄ ] SiCw. The preferential interfacial precipitate decreased the Al content in the matrix, resulting in a decrease in the amount of continuous precipitates. As a consequence, the age-hardening efficiency in the composite was lower.
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