纳米SiCp/108Al复合材料的组织与性能  

Microstructure and Properties of Nano-sized SiCp/108Al Composite

作　　者：李剑云[1] 谢敬佩[1,2] 王爱琴[1,2] 朱鹏飞[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南科技大学有色金属共性技术河南省协同创新中心,河南洛阳471023

出　　处：《河南科技大学学报（自然科学版）》2017年第5期1-6,共6页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(51371077)

摘　　要：采用粉末冶金法制备了不同体积分数SiC颗粒增强的纳米SiCp/108Al复合材料。利用光学显微镜、扫描电子显微镜、透射电子显微镜对复合材料的微观组织及拉伸断口形貌进行了表征,测定了复合材料的相对密度、硬度、抗拉强度、屈服强度及延伸率,分析了纳米SiC颗粒体积分数对复合材料组织及性能的影响。分析结果表明:添加纳米SiC颗粒的SiCp/108Al复合材料组织明显细化,性能得到提高。当纳米SiC颗粒体积分数为2%时,复合材料组织的晶粒最细小,缺陷较少,同时纳米SiC颗粒分布均匀,复合材料的性能最佳,相对密度达到98%。复合材料的硬度达到102HV,抗拉强度达到348MPa,屈服强度达到229MPa,分别比108Al基体提高了34%、26%和43%。当纳米SiC颗粒体积分数较大时,SiC颗粒会出现明显团聚现象,导致复合材料的性能降低。Nano-sized SiCp/108 Al composite reinforced with different volume fraction of nano-sized SiCp was prepared by powder metallurgy method. The microstructure and fracture morphology of the composite were characterized by optical microscope,scanning electron microscope and transmission electron microscopy. The relative density,hardness,tensile strength,yield strength and elongation were tested. The effects of nano-sized SiCp volume fraction on the microstructure and properties of the composite were analyzed. The results show that the microstructure of nano-sized SiCp/108 Al composite is refined obviously and the properties are improved compared with 108 Al matrix. The grains in the microstructure of the composite with the of 2% volume fraction nano-sized SiCp are small and less defect. The nano-sized SiCp distributes more uniformly and the properties are best. The relative density with 2% volume fraction nano-sized SiCp/108 Al composite is 98%. The hardness,tensile strength and yield strength reach 102 HV,348 MPa and 229 MPa,which increase by 34%,26% and 43% respectively compared with 108 Al matrix. Reunion phenomenon obviously appears when the volume fraction of nano-sized SiCp is larger,and the reinforcement effect is impaired.

关 键 词：粉末冶金 纳米SIC颗粒 铝基复合材料 组织 性能 

分 类 号：TB333.12[一般工业技术—材料科学与工程]