以还原铁粉和Al-20Si为反应物,采用熔体反应法原位反应生成Al-Si-Fe/Al-20Si复合材料,通过Mn、Sr、Y对复合材料进行变质处理,并对样品进行T6处理。研究了复合材料的显微组织及室温干滑动摩擦磨损性能。结果表明,变质后复合材料的耐磨性明显高于基体,热处理后所有样品的耐磨性均高于铸态,其中热处理前采用Sr变质的复合材料耐磨性最好,热处理后经过Y变质的复合材料耐磨性最好。分析可知复合材料的耐磨性主要受富铁相和硅相粒子形貌和大小的影响,富铁相和热处理后高强度的基体会促进摩擦转移膜的形成,提高耐磨性。
In-situ Al-Si-Fe/Al-20Si composites were fabricated from Fe and Al-20Si. The composites were modi- fied with Mn, Sr, Y. The samples were treated by T6 heat treatment. The microstructure and the tribological properties of composites at room temperature were investigated. The results indicate that wear resistance of the modified composites were much better than that of Al-20Si alloy. The wear resistance of all samples with heat treatment is better than that without heat treatment. The composite modified with Sr shows the best wear resistance among the as-cast composites, while the best one among the heat-treated composites is that modified with Y. Analysis shows that the shape and the size of the iron-rich phase and eutectic Si phase have significant influence on the wear resistance of the composites. The iron-rich phase and the matrix with high strength in the heat-treated composites could promote the formation of tribolayer and improve the wear resistance.
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