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Al–20Si matrix composites reinforced with SiC particles have been fabricated by high pressure solidification and the effects of solidification pressure and SiC volume fraction on the thermal expansion behaviour have been systematically investigated. A peak of the coefficient of thermal expansion (CTE) is observed during the first heating process due to the precipitation of Si from the supersaturated...
Evolution of microstructure and precipitation process of 40%SiC p /Al–20Si composite solidified under high pressures were investigated. The results demonstrate that undissolved Si phase under 1GPa is much smaller than 0.02GPa, and disappears under 2GPa. Primary α-Al phase appears at 1GPa, and with increased pressure, more primary α-Al phase emerges. Eutectic silicon phase is modified effectively...
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