离心铸造自生颗粒增强Al-16Si-7Ti复合材料的组织与性能  

Microstructure and Properties of Al-16Si-7Ti Composites Reinforced with In-situ Primary Particles

作　　者：林雪冬[1] 黄笑宇 孙建[1] 张荣[1] Lin Xuedong;Huang Xiaoyu;Sun Jian;Zhang Rong(College of Mechanical Engineering,Chongqing Vocational Institute of Engineering;Dongfeng-Nissan Co.,Ltd.)

机构地区：[1]重庆工程职业技术学院机械工程学院 [2]东风日产乘用车公司

出　　处：《特种铸造及有色合金》2018年第7期751-754,共4页Special Casting & Nonferrous Alloys

基　　金：重庆市教委科研资助项目(KJ1503310)

摘　　要：采用离心铸造工艺制备自生颗粒增强Al-16Si-7Ti复合材料筒状件,使用SEM,EDS及OM观察分析复合材料中的微观组织,并研究热处理对复合材料组织与性能的影响。结果表明,筒状铸件由聚集大量自生初生TiAlSi/Si颗粒(增强相)的外层、中间无颗粒基体层以及含有极少量初生Si颗粒的内层3层组织构成。热处理后,铸件中初生TiAlSi增强相的形貌基本没有变化,初晶Si颗粒棱角趋于圆润,树枝状共晶组织溶断、钝化,并呈点棒状弥散分布。复合材料时效态的硬度值(HRB)最高,达67.5;且时效态试样耐磨性明显优于铸态,其体积磨损量较铸态减少65%。The Al-16 Si-7 Ti composite tubes reinforced with in-situ primary particles were prepared by centrifugal casting.Microstructure in the composites prepared was observed and analyzed by SEM,EDS and OM,and the effects of heat treatment on the microstructure and properties of the composites were investigated.The results show that the centrifugal casting of Al-16 Si-7 Ti composites forms three layer structures,the outer layer containing a large number of primary TiAlSi/Si particles（the enhancement phase）,the middle layer of particle free matrix zone,and the inner layer with a very small amount of primary Si particles.After heat treatment,the morphology change of primary TiAlSi phase can be ignored and the sharp corners of the primary Si particles tends to be spherical,and the eutectic structure is dissolved and presents a punctate distribution.The hardness value of the aged alloy reaches HRB 67.5.The wear resistance of the composites after aging treatment is also better than that of the as cast ones,and the volume wear of the aged composite is reduced by 65%.

关 键 词：Al-16Si-7Ti复合材料 热处理 组织性能 

分 类 号：TB331[一般工业技术—材料科学与工程] TB249.4