Abstract
Aging behaviors of the high-volume-fraction SiCp/Al-Mg-Si composite fabricated by pressureless-infiltration and its base alloy at 170 °C were investigated in this study. The result indicates that the hardness of the composite is much higher and earlier to arrival to the peak-hardness than that of the base alloy. Al-Mg-Si alloy presents “double-peak phenomenon” in the aging treatment process, which can be attributed to the precipitation of the GP zones and the co-existence of the β″, β′ and Type C precipitates. The 55% SiCp/Al composite only presents one, which is due to the co-existence of the GP zone, β″, β′ and Type A precipitates. The maximum hardness increments of Al-Mg-Si alloy and the composite are 242% (4 h) and 22% (3 h) after aging treatment.
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