Al2O3颗粒含量对Cu基复合材料组织与性能影响  

Influence of Al2O3 Content on Microstructure and Properties of Cu Matrix Composites

作　　者：刘贵民 杜林飞 闫涛 惠阳 LIU Guimin;DU Linfei;YAN Tao;HUI Yang(Department of Equipment Maintenance and Remanufacturing Engineering,Academy of Army Armored Forces,Beijing 100072,China)

机构地区：[1]陆军装甲兵学院装备维修与再制造工程系

出　　处：《热加工工艺》2018年第18期89-92,共4页Hot Working Technology

基　　金：北京市自然科学基金项目(2152031)

摘　　要：采用机械合金化与放电等离子烧结的方法制备了不同Al2O3体积分数的Cu-Al2O3复合材料。研究了Al2O3颗粒含量对Cu-Al2O3复合材料组织与性能的影响,特别是对导电性能的影响,比较了孔隙、第二相颗粒等不同因素对导电性能的影响。结果表明：随着Al2O3体积分数的增加,复合材料颗粒发生团聚,孔隙数量逐渐增多,材料的致密化程度不断下降;基体中弥散分布的Al2O3纳米颗粒可以显著提升复合材料的抗拉强度,抗拉强度最大达到596 MPa,伸长率最大可达3.65%。但Al2O3纳米颗粒的加入会导致复合材料导电率的下降,球磨过程中引入的杂质铁对复合材料导电性能影响最大,其次是纳米晶晶界、纳米Al2O3颗粒和孔隙,位错对导电性能的影响最小。Cu-Al2O3c omposite with different volume fraction of Al2O3 were prepared by mechanical alloying and spark plasma sintering.The effects of Al2O3 particle content on microstructure and properties of Cu-Al2O3 composites were studied,especially the electrical conductivity of Cu-Al2O3 composites.The effects of different factors such as porosity and second phase particles,on the electrical conductivity were compared.The results show that,with the increase of Al2O3 volume fraction,the particles of the composites become agglomerated,the number of pores gradually increases,and the densification degree of the composites decreases.The dispersive distribution of Al2O3 nanoparticles in the matrix can significantly improve the tensile strength of the composite.The maximum tensile strength is 596 MPa and the maximum elongation is 3.65%.However,the addition of Al2O3 nanoparticles leads to the decrease of conductivity of the composites.The impurity iron introduced in the ball milling process has the greatest influence on the conductive properties of the composites,followed by nanocrystalline grain boundary,nano Al2O3 particles and pores,and the dislocation has the least influence on the conductivity.

关 键 词：CU-AL2O3 颗粒含量 物理与力学性能 导电性能 

分 类 号：TB333.12[一般工业技术—材料科学与工程]