| Summary: | In this article, the microstructural characteristics and the wear resistance performance of two kinds of high silicon aluminium alloys to produce gradient structure by rheological squeeze casting has been investigated. The mechanism effect of Fe-rich phase on microstructure homogeneity and wear characteristics was also studied. Experimental results present that liquid flow could be impeded because of being acicular Fe-rich phase, resulting in liquid segregation phenomenon and discontinuity gradient distribution of hard phase. Through adding 1.4 wt% Mn element into Al-22Si-2Fe alloys, the morphology of Fe-rich phase was improved, which acicular structure transformed to blocky structure. Because of higher hardness than Al matrix, blocky Fe-rich phase displayed softer hardness than Si particles, thereby buffering Hertz force and shear force, and bearing some load during wear process, which improved wear resistance of alloys.
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