Abstract
Due to the high specific stiffness and low coefficient of thermal expansion, the SiC particles are introduced to improve the dimensional stability of Al-Cu-Mg (2024 aluminum) alloy in present work. The intergrated effects of SiC and aging precipitates on dimensional stability of 2024 aluminum alloy are investigated during the two-stage aging process. It is observed that, with increasing the addition of SiC, the amount of S′ precipitates decreases, and the micro-yield strength first increases and then decreases, while the thermal strain (εc) first decreases and then increases. When the addition of SiC was 10 wt%, both the micro-yield strength and the thermal strain reach the optimal value. It is attributed to the effect of SiC and aging precipitates on pinning the dislocations, which would consume more stored elastic energy, thus leading to an increase in the dimensional stability of the alloy.
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