Abstract
Hypereutectic Al–Si alloys are good candidates for many applications including automotive industry and heavy wear environments. Among them, A390 is widely used for cylinder blocks, transmission pumps, and air compressor housings. Due to high silicon content, primary and eutectic Si size and their morphologies have a significant effect on wear resistance of this alloy. In this research, the effect of Sr and Sb addition on the cast A390 alloy is examined and compared with unmodified alloy. Results suggest an enhanced wear resistance in Sb addition, whereas the Sr improved the wear resistance moderately compared with unmodified alloy. The involved mechanism (at nano and micro scales) and the microstructural evolution in each condition were analyzed and discussed.
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