原位合成TiB_2/Al-5Cu复合材料的微观组织及摩擦磨损行为

Microstructure and Wear Behavior of In-situ TiB_2/Al-5Cu Composites

采用混合盐反应法制备了TiB2/Al-5Cu复合材料,通过XRD、SEM、EDS和摩擦磨损试验等材料分析方法测试了复合材料的微观组织和耐磨性能。研究表明,内生TiB2颗粒分布均匀,平均尺寸约为500nm。TiB2颗粒的引入显著细化了复合材料的凝固组织。复合材料的耐磨性能比基体合金有明显的提高,原因是表面形成了一层致密的机械混合层。TiB2颗粒在摩擦过程中起着抑制金属流动和支撑的双重作用。

In-situ TiB2 particle reinforced Al-5Cu alloy composites were synthesized successfully by reaction of mixed salt with aluminum melt.Microstructure and wear resistance of the prepared composites were observed by XRD(X-ray diffraction),SEM(scanning electron microscope)and EDS(energy dispersive spectrum)and wear-frictional testing.The results show that in-situ TiB2 particle with size in approximately 500 nm is uniformly distributed into the composites,and microstructure of the composites is greatly refined.Wear resistance of the composites is obviously superior to that of matrix alloy,which is attributed to the formation of a compact mechanical-mixed layer.TiB2 particle exhibits double effects of inhibiting metal flow and taking some loading during wear testing process.