Microstructural characteristics and properties in centrifugal casting of SiC_p/Zl104 composite  

作　　者：王开 薛寒松 邹茂华 刘昌明 

机构地区：[1]College of Materials Science and Engineering,Chongqing University [2]Institute of Metals Research,Chinese Academy of Sciences

出　　处：《中国有色金属学会会刊：英文版》2009年第6期1410-1415,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(2008BB4177)supported by Natural Science Foundation of Chongqing City,China

摘　　要：The microstructural characteristics and Brinell hardness of a cylinder produced by centrifugal casting were investigated using 20%(volume fraction)SiCp/Zl104 composites.Macrostructure and XRD analysis show that most of SiC particles segregate to the external circumference of the cylinder,the other SiC particles maintain in the inner circumference of the cylinder,and a free particle zone is left in the middle circumference of the cylinder.Microstructural characteristics and quantitative assessment of SiC particles show that most of congregated SiC particles in 20%SiCp/Zl104 composites are dispersed by centrifugal force,and the other congregated SiC particles and most of alumina oxide are segregated to the inner circumference of the cylinder.The SiC particles in aluminum melt can promote the refinement of primaryα(Al)during solidification,and fine primaryα(Al)grains can also promote the uniform distribution of SiC particles.Brinell hardness of SiCp/Zl104 composites is connected with not only the volume fraction of SiC particles,but also the distribution of SiC particles in matrix alloy.The microstructural characteristics and Brinell hardness of a cylinder produced by centrifugal casting were investigated using 20% （volume fraction） SiCp/Zl104 composites. Macrostructure and XRD analysis show that most of SiC particles segregate to the external circumference of the cylinder, the other SiC particles maintain in the inner circumference of the cylinder, and a free particle zone is left in the middle circumference of the cylinder. Microstructural characteristics and quantitative assessment of SiC particles show that most of congregated SiC particles in 20%SiCp/Zl104 composites are dispersed by centrifugal force, and the other congregated SiC particles and most of alumina oxide are segregated to the inner circumference of the cylinder. The SiC particles in aluminum melt can promote the refinement of primary α（Al） during solidification, and fine primary α（Al） grains can also promote the uniform distribution of SiC particles. Brinell hardness of SiCp/Zl104 composites is connected with not only the volume fraction of SiC particles, hut also the distribution of SiC particles in matrix alloy.

关 键 词：复合材料 离心铸造 铸造性能 SIC颗粒 颗粒体积分数 SIC粒子 X射线衍射分析 碳化硅颗粒 

分 类 号：TB33[一般工业技术—材料科学与工程] TG249.4[金属学及工艺—铸造]