添加Cu对SiC_(p)/Al-Si复合材料组织与性能的影响  

Effect of Cu addition on microstructure and properties of SiC_(p)/Al-Si composites

作　　者：任俊鹏 王毓 董翠鸽 赵君 Ren Junpeng;Wang Yu;Dong Cuige;Zhao Jun(School of Chemistry and Materials Science,Guizhou Education University,Guiyang Guizhou 510018,China;School of Materials Science and Engineering,Central South University,Changsha Hunan 410083,China)

机构地区：[1]贵州师范学院化学与材料学院,贵州贵阳510018 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《金属热处理》2021年第8期36-42,共7页Heat Treatment of Metals

基　　金：贵州省自然科学基金(黔科合基础-ZK[2021]一般254,黔科合基础[2018]1122,[2019]1252,黔研合人才[2019]5778-08);国家自然科学基金(21464005)。

摘　　要：利用X射线衍射仪、扫描电镜、电子天平、力学性能试验机等研究了Cu元素含量对粉末冶金法制备的SiC_(p)/Al-Si复合材料组织与性能的影响。结果表明:添加Cu元素后,材料的致密度、硬度、抗拉强度及耐摩擦磨损性能都获得了较大的提高,且强度在Cu含量为4%(质量分数)时达到最大值。由于在基体中以铜粉的形式添加Cu元素时,较低温度下即可在Al-Cu边界通过互扩散形成液相,从而填充基体及界面处的缝隙、孔洞等缺陷;并且在压坯快速冷却到室温的过程中,生成的α-Al和Al_(2)Cu相均对材料有强化作用,使得复合材料的综合力学性能获得提高。Influence of different content of Cu addition on microstructure and properties of the SiC_(p)/Al-Si composites prepared by powder metallurgy was studied by means of X-ray diffraction,scanning electron microscopy,precision electronic balance and universal testing machine.The results show that the addition of Cu element leads that the density,hardness,tensile strength,friction and wear resistance of the material are improved greatly,and the strength reaches the maximum when the Cu content is 4%(mass fraction).Since the Cu element is added in the form of copper powder in the matrix,a liquid phase can be formed through mutual diffusion at the Al-Cu boundary even at a lower temperature,thereby filling the gaps,holes and other defects in the matrix and at the interface.During rapid cooling of the green compact to room temperature,α-Al and Al_(2)Cu phases are produced and both have strengthening effect on material,which improves the comprehensive mechanical properties of the SiC_(p)/Al-Si composites.

关 键 词：SiC_(p)/Al-Si复合材料 Cu元素 SIC颗粒 显微组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]