Mechanical properties and fracture mechanisms of aluminum matrix composites reinforced by Al_9(Co,Ni)_2 intermetallics  

作　　者：程素玲 杨根仓 朱满 王锦程 周尧和 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第4期572-576,共5页中国有色金属学报（英文版）

基　　金：Project(50571081)supported by the National Natural Science Foundation of China;Project(04G53024)supported by the Aviation Foundation of China

摘　　要：The microstructures and mechanical properties of Al matrix composites reinforced by different volume fractions of Al-Ni-Co intermetallic particles were investigated.Three different volume fractions of Al-Ni-Co particles were added to pure Al matrix using a stir-casting method.Microstructural analysis shows that with the increasing of the reinforcement volume fraction,the matrix grain size decreases and the porosity increases.The mechanical properties of the composites are improved over the matrix materials,except for the decreasing of the ductility.Fracture surface examination indicates that there is a good interfacial bonding between the Al matrix and the Al-Ni-Co particles and the fracture initiation does not occur at the particle-matrix interface.The microstructures and mechanical properties of Al matrix composites reinforced by different volume fractions of Al-Ni-Co intermetallic particles were investigated.Three different volume fractions of Al-Ni-Co particles were added to pure Al matrix using a stir-casting method.Microstructural analysis shows that with the increasing of the reinforcement volume fraction,the matrix grain size decreases and the porosity increases.The mechanical properties of the composites are improved over the matrix materials,except for the decreasing of the ductility.Fracture surface examination indicates that there is a good interfacial bonding between the Al matrix and the Al-Ni-Co particles and the fracture initiation does not occur at the particle-matrix interface.

关 键 词：aluminium matrix composites Al-Ni-Co quasicrystal mechanical properties INTERMETALLICS 

分 类 号：TB331[一般工业技术—材料科学与工程]