真空热压烧结SiC_p/Al复合材料的界面元素扩散及增强断裂机理  

Element Diffusion on Interface and Reinforcing and Fract ure Mechanisms of SiC_p/Al Composites by Vacuum Hot-Pressing Sintering Processing

作　　者：胡锐[1] 袁秦鲁 李金山[1] 吕振林[3] 

机构地区：[1]西北工业大学凝固技术国家重点实验室 [2]西安理工大学材料学院,西安710048 [3]西安理工大学材料学院

出　　处：《机械科学与技术》2004年第10期1198-1200,共3页Mechanical Science and Technology for Aerospace Engineering

基　　金：航空科学基金项目 ( 0 1G5 3 40 1) ;国防基础研究( 2 0 0 1BF0 5 0 9);西北工业大学"英才培养计划"基金( 5 2 10 2 0 10 1 0 40 0 0 2 0 113 )资助

摘　　要：采用真空热压粉末冶金烧结工艺制备了含SiC颗粒体积分数分别为 5 %、15 %和 2 5 %的SiC颗粒增强铝基复合材料 ,结合其力学性能、扫描电镜和界面微区能谱分析结果 ,分析了SiC/Al复合材料的真空烧结过程中的界面现象 ,以及材料增强和断裂机理。结果表明 ,真空烧结过程中出现了界面反应 ,改善了界面结合强度 ,断裂破坏主要在基体上进行。随着SiC粒子体积分数的增加 ,SiCp/Al复合材料的抗拉强度增加 ,弹性模量显著增加 ,延伸率降低 ,材料脆性增加。SiC p particular reinforced Al matrix composite s, with 5%,15% and 25% volume fraction content of SiC particles, were prepared by vacuum hot-pressing sintering processing in this paper. Based on mechanics perf ormance, SEM pictures and energy spectrum on interface tiny region, interface re action phenomenon of SiC p/Al composite by vacuum hot-pressing sintering, reinforcment and fracture mechanisms were analyzed. The results show that interf ace element diffusion and reaction on interface in vacuum hot-pressing sinterin g processing improved interface strength. Fracture occurred mainly in Al matrix. The tensile strength and elasticity module of SiC p/Al composite were incr eased with the volume fraction content of SiC particles, but its elongation was decreased, brittleness was increased.

关 键 词：颗粒增强 铝基复合材料 强化机理 

分 类 号：TB33[一般工业技术—材料科学与工程]