超声外场对原位TiB2/2A14铝基复合材料的摩擦磨损性能的影响  

Effect of ultrasonic field on friction and wear properties of in -situ TiB2/2A14 composite materials

作　　者：黄凯 蒋日鹏[1,2] 李晓谦 李瑞卿[1,2] 张立华 HUANG Kai;JIANG Ri-peng;LI Xiao-qian;LI Rui-qing;ZHANG Li-hua(Institute of Light Alloy Research,Central South University,Changsha 410083,China;State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha 410083,China;College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学轻合金研究院,长沙410083 [2]中南大学高性能复杂制造国家重点实验室,长沙410083 [3]中南大学机电工程学院,长沙410083

出　　处：《材料工程》2019年第12期78-84,共7页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51805549)

摘　　要：采用超声外场-原位混合盐反应法制备3%TiB 2/2A14(体积分数)铝基复合材料,在往复式摩擦磨损试验机上进行4种不同载荷(20,30,40,50N)的磨损实验,研究不同超声处理工艺制备的复合材料的耐磨性和摩擦行为。使用显微硬度计测量基体和复合材料的显微硬度。采用X射线衍射仪、扫描电子显微镜对测试样品进行物相成分鉴定、显微组织和表面磨损形貌观察,并研究其磨损机理。结果表明:超声能够有效打散颗粒团聚,改善颗粒分布状态,强化颗粒与基体的界面结合强度,因此经过超声处理的复合材料的耐磨性和显微硬度明显优于合金基体。经120s超声处理获得的复合材料,其硬度约为基体合金的2倍。在50N载荷的作用下,其磨损率约为基体合金的57.43%。在干摩擦条件下,基体主要表现为黏着磨损,复合材料表现为黏着磨损+磨粒磨损的混合型磨损,耐磨性能更佳。The 3%TiB 2/2A14(volume fraction)aluminum matrix composites were prepared by in-situ salts-metal reaction under ultrasonic field.The wear experiments with four different load(20,30,40,50N)were carried out with a reciprocating tribometer.The abrasive resistance and friction behavior of composites with different ultrasonic vibration treatment(UVT)process were studied.The mircohardness of matrix and composites were measured by the microhardness tester.The X-ray diffraction(XRD)and scanning electron microscopy(SEM)were applied to identify the phase compositions and observe the microstructure and morphology of worn surfaces.And the wear mechanism was also studied.The results manifest that the ultrasonic can efficiently scatter the particle agglomerations,improve the state of particle distribution and reinforce the interfacial bonding strength between particles and matrix.Therefore,the abrasive resistance and microhardness of composites with UVT are obviously superior to alloy matrix.The wear rate and hardness of composites obtained by 120s UVT are about 57.43%and two times of that of the matrix alloy under 50N load.Under the dry friction condition,the main wear mechanism of alloy matrix is adhesion wear and composites is hybrid wear with adhesion wear and abrasive wear and the wear resistance is better.

关 键 词：TIB 2增强颗粒 原位反应 铝基复合材料 摩擦磨损 

分 类 号：TB331[一般工业技术—材料科学与工程]