SiC_P/Al复合材料高应变率压缩变形及损伤机理  

Deformation and Damage Mechanisms of SiC/Al Matrix Composite under High Compressive Stain

作　　者：胡锐[1] 袁秦鲁[1] 李金山[1] 吕振林[2] 李玉龙[1] 

机构地区：[1]西北工业大学 [2]西安理工大学

出　　处：《稀有金属材料与工程》2005年第4期653-656,共4页Rare Metal Materials and Engineering

基　　金：航空科学基金资助项目(01G53401);陕西省自然基金项目(2003CS0402);西北工业大学"英才培养计划"基金(521020101-0400-020113);国防基础研究项目(2001BF0509)

摘　　要：采用真空热压工艺制备了含SiC颗粒体积分数分别为5%,15%和25%的SiC颗粒增强铝基复合材料,利用Hopkinson高速压杆冲击实验系统对其从静态到动态(应变率为3.3×10-3s-1～5.2×103s-1)的压缩破坏响应进行了研究,结合其光学显微镜分析变形组织,分析了不同体积分数SiCp/Al复合材料高应变率压缩载荷下,材料的变形和微观损伤机理.结果表明,复合材料存在应变率敏感性,SiC含量的增加导致复合材料应变率敏感性的增加,以垂直于载荷方向的增强相颗粒的剪切开裂为主要破坏模式.SiCp/Al matrix composites, with 5%, 15% and 25% volume fraction content of SiC particulates, were prepared by vacuum hot-pressing sintering processing. The dynamic responses of SiC/Al composites were studied with a split Hopkinson pressure bar in compression and a driving system. The deformation microstructure and failure mechanism were analyzed. The types of nominal stress-strain curves from quasistatic state rate (3.3 X 10(-3)s(-1)) to dynamic state compressive strain rate (5.2 X 10(3)s(-1)) under compressive loading have been identified. The deformation microstructures of tested specimens were analyzed by using optical microscope. Deformation and damage mechanisms of the composite material with different SiC volume fraction content were researched under high rate compressive loading. The results show that these composites exhibit strain rate sensitivity. And increasing of SiC particulates content led to an increase in strain rate sensitivity of composites. Damage mode is mainly the reinforced particulates shear fracture in vertical loading direction.

关 键 词：铝基复合材料 高应变率 压缩变形机理 

分 类 号：TB333[一般工业技术—材料科学与工程]