Effects of volume fraction of SiC particles on mechanical properties of SiC/Al composites  

作　　者：宋旼 

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University

出　　处：《中国有色金属学会会刊：英文版》2009年第6期1400-1404,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(200805331044)supported by PhD Programs Foundation of Ministry of Education of China;Project(50801068)supported by the National Natural Science Foundation of China;Project(2008RS4020)supported by Postdoctoral Scientific Program of Hunan Province,China;Projects(200801345,20070410303)supported by China Postdoctoral Science Foundation

摘　　要：SiC particle reinforced pure aluminum composites were fabricated using a powder metallurgy method.The effect of the volume fraction of the SiC particles on the mechanical properties of the composites was studied by both model simulation and experiment.The results indicate that the yield strength and tensile strength increase,but the elongation decreases with the increase in the volume fraction of the SiC particles.Both the modified shear lag model and the multi-scale model predicted yield strength and normalized elongation show similar evolution trends with the experimental data.However,the modified shear lag model underestimates the yield strength due to the ignorance of the strengthening mechanisms caused by grain refinement and dislocations interaction by the introduction of the SiC particles,and the multi-scale model overestimates the normalized elongation due to the ignorance of the pores distributed in the matrix.SiC particle reinforced pure aluminum composites were fabricated using a powder metallurgy method. The effect of the volume fraction of the SiC particles on the mechanical properties of the composites was studied by both model simulation and experiment. The results indicate that the yield strength and tensile strength increase, but the elongation decreases with the increase in the volume fraction of the SiC particles. Both the modified shear lag model and the multi-scale model predicted yield strength and normalized elongation show similar evolution trends with the experimental data. However, the modified shear lag model underestimates the yield strength due to the ignorance of the strengthening mechanisms caused by grain refinement and dislocations interaction by the introduction of the SiC particles, and the multi-scale model overestimates the normalized elongation due to the ignorance of the pores distributed in the matrix.

关 键 词：颗粒体积分数 SIC粒子 复合材料 力学性能 碳化硅颗粒增强 多尺度模型 模型仿真 屈服强度 

分 类 号：TB33[一般工业技术—材料科学与工程]