Research Progress on Silicon Phase Refinement in Hypereutectic Al-Si Alloys
Hypereutectic Al-Si alloys have attracted attention due to their good wear resistance,but coarse primary silicon and needle-like eutectic silicon in the microstructure limits their further widespread use.Some current methods of silicon phase refinement in hypereutectic Al-Si alloys,such as alloying,modification treatment,and improvement of preparation process,were reviewed.The effect of alloying on the microstructure of hypereutectic Al-Si alloys was mainly introduced;then the refining effects of various modifiers were compared and analyzed;the effect of improving the preparation process on the size and morphology of the silicon phase was discussed.Finally,the future research direction was pointed out:the development of new composite modifier suitable for wide use should be concentrated and combining modification and improvement of the preparation process should be used to obtain hypereutectic Al-Si alloy with more excellent properties.
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