原位Al/_2O_(3P)/7075复合材料微观组织与磨损行为  

Microstructure and Wear Behaviors of In-situ Al_2O_(3P)/7075 Composites

作　　者：刘慧敏[1] 杨树青[1] 许萍[1] 李进福[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051

出　　处：《材料工程》2012年第11期1-5,共5页Journal of Materials Engineering

基　　金：内蒙古自然科学基金项目(20080404ZD17)

摘　　要：采用原位反应近液相线铸造法制备具有不同质量分数的Al2O3P/7075复合材料,并对其进行干滑动磨损实验研究,通过OM,SEM,TEM等材料分析方法测试了材料的微观组织和磨损表面形貌。结果表明,原位Al2O3颗粒对7075铝合金的晶粒组织有明显细化效果,Al2O3P/7075复合材料的耐磨性比基体7075铝合金有明显的提高。原因是原位合成的复合材料界面结合良好,原位Al2O3颗粒在摩擦过程中起着抑制金属流动和支撑的双重作用。磨损表面形貌显示,原位Al2O3颗粒的加入,使磨损机制由黏着磨损变为磨粒磨损,从而改善了材料的耐磨性。The Al2O3P/7075 Al composites were synthesized by in-situ reaction near-liquidus casting.The microstructure and dry sliding wear behavior of the prepared composites were analyzed using OM,SEM and TEM as well as wear friction testing.The results reveal that in-situ Al2O3 particle with average size of approximately 1μm is uniformly distributed in the matrix,which exhibits desirable refining effects on microstructure of 7075 Al alloy.The wear behavior of the composites is greatly superior to that of the matrix,which is attributed to the grain refining and formation of a compact interface of Al2O3P/7075 Al composites.In addition,in-situ Al2O3 particles exhibit coupling effects of inhibiting metal flow and bearing some load in process of friction.The wear mechanism of the matrix 7075Al alloy is adhesive wear,while the wear surface of Al2O3P/7075 Al composites is superior to that of the matrix 7075 Al alloy.The wear mechanism of Al2O3P/7075 Al composites is abrasive wear,and wear resistance of Al2O3P/7075 Al is improved.

关 键 词：原位Al2O3颗粒 铝基复合材料 组织 耐磨性能 

分 类 号：TB333[一般工业技术—材料科学与工程] TG115.213.1[金属学及工艺—物理冶金]