Abstract
Precipitation sequence of the Al 2 O 3 /Al-Cu-Mg and Al-Mg-Si composite materials were investigated by high resolution transmission electron microscope (HRTEM) and differential scanning calorimeter (DSC). Precipitation sequence of the Al 2 O 3 /Al-Cu-Mg composite material changed from that of Al-Cu-Mg alloy (GPB zones S') to that of Al-Cu alloy (GP zone → θ) based on results by HRTEM observation. Precipitation sequence of the Al 2 O 3 /Al-Mg-Si composite material was similar to that of an Al-Mg 2 Si alloy including Si in excess (excess Si alloy). A DSC curve of an Al 2 O 3 /Al-Mg-Si composite material was not in agreement with that of an Al-Mg 2 Si alloy. Major peaks in DSC curve of this composite were not clear and this behavior was similar to that of an excess Si alloy including lower Mg 2 Si contents rather than a quasi-binary Al-Mg 2 Si alloy.
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