电磁铸造法制备的(Al2O3+Al3Zr)p/A359复合材料的磨损行为

利用A359-Zr(CO3)2体系原位反应合成法制备(Al2O3 Al3Zr)p/A359颗粒增强铝基复合材料,在制备过程中施加低频交变电磁场进行搅拌以提高复合材料的耐磨性能.干滑动摩擦磨损试验表明:复合材料的耐摩擦性比纯基体合金明显提高,施加电磁搅拌后复合材料的耐摩擦性进一步提高,特别是在较大载荷下的耐摩擦性大幅提高,从轻微磨损到急剧磨损的临界转变载荷由58.8 N提高到78.8 N.磨损表面的SEM分析显示:纯基体合金为粘着磨损和剥层磨损,复合材料的磨损为以磨粒磨损为主和少量的剥层磨损,施加电磁搅拌后的复合材料为纯磨粒磨损.

Wear Behavior of (Al2O3+Al3Zr)p/A359 Composites by in-Situ Electromagnetic Casting

The particle reinforced aluminum alloy matrix composites, (Al2O3+Al3Zr)p/A359, was fabricated by In-situ reaction in melt A359 and Zr(CO3)2 system. During the fabrication process, a low frequency alternative electromagnetic field was employed to improve the properties of composites by EMS (electromagnetic stirring). The results of dry sliding friction experiments indicate that the wear resistance of composites is better than that of pure matrix alloy. And the wear resistance of composites under a heavy load is further improved by imposing EMS in the fabrication process. By comparison with the composites fabricated without imposing EMS, the critical transition load from mild wear to severe wear of the composites increases from 58.8 N to 78.8 N. The scanning electron microscopy (SEM) analysis of worn-out surfaces indicate that the wear mechanism of pure matrix alloy is adhesive wear and spalling wear, that of composites without EMS in fabrication is mainly abrasion and that of electromagnetic fabricated composites is pure abrasion.