Synthesis and properties of nanocrystalline nonferrous metals prepared by flow-levitation-molding method

摘要：

Nanocrystalline nonferrous metals (Cu,Al,and Ag) were synthesized by flow-levitation-molding method.The microstructure of the as-prepared nanocrystalline metals was characterized by XRD and FESEM.The microhardness and electrical resistivity were tested by the HMV亅2 type Microhardness Tester and 6157 type Electrometer,respectively.The synthesis process was also studied.The results show that the spheriform particles in nanocrystalline metals have average grain size of 20亅30 nm.The relative density of nanocrystalline Cu,Al,and Ag are 95.1％,98.1％ and 98.3％,respectively.The microhardness of nanocrystalline Cu,Al and Ag are 2.01,2.11 and 1.26 GPa respectively,which are larger than those of their coarse-grained counterparts by the factor of 4.5,14,and 2.5,respectively.The electrical resistivity of nanocrystalline Cu at room temperature is 1.5亊10亅7 丒m,which is higher than coarse-grained Cu by a factor of 7.5.The pressure is the predominant factor influencing the density of the as-prepared nanocrystalline nonferrous metals.

关键词： nanocrystalline nonferrous metals flow-levitation-molding density microhardness electrical resistivity

作者: LIU Wei YANG Tian-zu CHU Guang LUO Jiang-shan TANG Yong-jian

作者单位: School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China;Insti Institute of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）