强烈塑性变形对Ag-Y2O3复合材料显微组织、力学和电学性能的影响  

Effect of Severe Plastic Deformation on the Microstructure and Properties of Ag-Y_2O_3 Composites

作　　者：张国庆[1,2] 陈敬超[3] 尹志民[1] 

机构地区：[1]中南大学,湖南长沙410083 [2]昆明贵金属研究所,云南昆明650106 [3]昆明理工大学,云南昆明650093

出　　处：《稀有金属材料与工程》2008年第11期2000-2003,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50361003);云南省中青年学术带头人后备人才项目(2006py01-42);云南省重点项目(2006E0003Z)联合资助

摘　　要：采用反应合成法制备出Ag-Y2O3复合粉体,研究了大挤压比挤压工艺对Ag-Y2O3(Y2O3质量分数为8%)复合材料显微组织、力学和电学性能的影响。结果表明:通过反应合成技术可以在Ag基体中形成尺寸细小的Y2O3颗粒;大塑性变形加工能够对Ag-Y2O3复合材料的显微组织起到均匀化和弥散化作用;Ag-Y2O3复合材料的显微组织为Ag基体中分布着细小Y2O3颗粒的复相组织;Ag-Y2O3复合材料的抗拉强度、电阻率等随真应变的增加而降低,延伸率随真应变的增加而提高。The Ag-Y2O3 composites were prepared by reaction synthesis processing, and the effect of severe plastic deformation on the microstructure, mechanical and electrical properties of Ag-Y2O3 composites were also studied. The results show that the fist, some tiny AgY2O3 in the Ag-matrix can be formed during reactive synthesis： The second, cumulative plastic deformation can make the size of Y2O3 clusters to decrease and make the Y2O3 clusters distributed in the Ag matrix, finally, with the increase of true strain, the tensile strength as well as electrical resistivity are reduced, while the elongation is increased.

关 键 词：复合材料 反应合成法 Ag-Y2O3 累积大塑性变形 

分 类 号：TB33[一般工业技术—材料科学与工程]