Microstructure and Tensile Properties of Yttria Coated-Alumina Particulates Reinforced Aluminum Matrix Composites  

作　　者：Zhiqiang YU, Gaohui WU, Longtao JIANG and Dongli SUNSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaPresent address: Department of Materials Science, Fudan University, Shanghai 200433, ChinaPh.D., to 

出　　处：《Journal of Materials Science & Technology》2005年第1期68-70,共3页材料科学技术（英文版）

基　　金：This investigation was supported by the National Natural Science Foundation of China(No.59771014 and 50071019).The supports are gratefully acknowledged.

摘　　要：The liquid-phase coating method was used to deposit Y2O3 ceramic on the surface of α-Al2O3. The coated-Al2O3p/6061AI composites were produced using squeeze casting technology. The microstructure and tensile properties of the composites were analysed and studied. The results showed that the coated AI2O3 particles are able to disperse homogeneously in the aluminum liquid. The microstructure of the composites is more even in comparison with that of as-received powders. The tensile testing indicated that mechanical properties of the coated-AI2O3p/6061AI composites are better than those of uncoated particles. In the composite with 30% volume fraction, the tensile strength, yield strength as well as elongation is increased by 29.8%, 38.4% and 10.3%, respectively. The SEM analysis of fracture indicated that the dimples of the coated-Al2O3p/6061Al composites are more even.The liquid-phase coating method was used to deposit Y2O3 ceramic on the surface of α-Al2O3. The coated-Al2O3p/6061AI composites were produced using squeeze casting technology. The microstructure and tensile properties of the composites were analysed and studied. The results showed that the coated AI2O3 particles are able to disperse homogeneously in the aluminum liquid. The microstructure of the composites is more even in comparison with that of as-received powders. The tensile testing indicated that mechanical properties of the coated-AI2O3p/6061AI composites are better than those of uncoated particles. In the composite with 30% volume fraction, the tensile strength, yield strength as well as elongation is increased by 29.8%, 38.4% and 10.3%, respectively. The SEM analysis of fracture indicated that the dimples of the coated-Al2O3p/6061Al composites are more even.

关 键 词：Submicron alumina powders Rare-earth oxide coating MICROSTRUCTURE Mechanical properties Aluminum matrix composite 

分 类 号：TB331[一般工业技术—材料科学与工程]