不同拉伸温度下SiC颗粒增强Al-Fe-V-Si复合材料的断裂行为  

Facture behavior of Al-Fe-V-Si composite reinforced with SiC particles at different tensile temperatures

作　　者：贺毅强[1] 乔斌[1] 王娜[2] 杨建明[1] 徐政坤[3] 尚峰[1] 陈振华[4] 

机构地区：[1]淮海工学院机械工程系,连云港222005 [2]淮海工学院人事处,连云港222005 [3]张家界航空工业职业技术学院机械工程系,张家界427000 [4]湖南大学材料科学与工程学院,长沙410082

出　　处：《中国有色金属学报》2010年第3期469-475,共7页The Chinese Journal of Nonferrous Metals

基　　金：江苏省高校自然科学研究资助项目(09KJD430001);江苏省高校重点建设学科资助项目

摘　　要：采用喷射沉积工艺制备SiCP/Al-11.7Fe-1.15V-2.4Si复合材料,并通过热压工艺对复合材料进行致密化,再通过热轧加工成板材。对复合材料的显微组织以及不同温度下复合材料的断裂性能和断口形貌进行研究。结果表明:采用热压致密后再热轧工艺能使SiC颗粒分布均匀,长轴方向平行于轧制方向,有利于增强复合材料的力学性能,复合材料的断裂性能和断面形貌与拉伸温度以及SiC的分布和取向相关,随着拉伸温度升高,SiC/Al界面强度减弱,拔断的SiC颗粒逐渐减少,SiC颗粒的拔出成为主要的裂纹源;与基体金属不同的是,复合材料的塑性随着温度升高而降低。SiCP/Al-11.7Fe-1.15V-2.4Si composite was prepared by spray deposition and densified by hot pressing,and then were rolled into sheets.The microstructures,fracture properties and fractographies of the composite at different tensile temperatures were investigated.The results show that the uniform distribution of the SiC particles with their longitudinal direction parallel to the rolling direction is achieved by rolling after hot pressing,which contributes to the elevation of the mechanical properties of the composite.Fracture properties and fractographies of the composite are affected by the tensile temperature and distribution and orientation of SiC particles.The bonding between SiC particles and the matrix becomes weak,and the breakable particles reduce as the tensile temperature;the debonding of SiC/Al becomes the dominant fracture mechanism,the plasticity of the composite decreases as the tensile temperature increases,which is different from the matrix alloy.

关 键 词：SIC颗粒 耐热合金 复合材料 喷射沉积 断裂行为 

分 类 号：TG146.2[一般工业技术—材料科学与工程]