Microstructure and wear resistance of(Mg2Si+Si)/Al composites
In-situ(Mg2Si+Si)/Al composites were prepared by using melting casting with different solidification rates.The microstructure and wear resistance of(Mg2Si+Si)/Al composites were investigated.The results show that,after P modification,the primary Mg2Si transformed to polygonal blocks,while the primary Si was mainly complex morphology.With increasing the solidification rate,the number of primary Mg2Si and primary Si particles increased and their particle sizes decreased.Extraction tests showed that the Mg2Si crystals had tetrahedral and hexahedral morphologies.Dry sliding wear behaviors of(Mg2Si+Si)/Al composites with different solidification rates against 45#steel,under conditions of different sliding speeds and loads,were investigated.The results show that,the wear resistance of(Mg2Si+Si)/Al composites increased with the increasing of the solidification rate.The wear mechanisms of(Mg2Si+Si)/Al composites are mainly adhesive wear and abrasive wear.
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