Synthesis and characterization of nanocrystalline Ni produced by cryomilling in liquid nitrogen
来源期刊：Rare Metals2007年第2期
论文作者：YANG Bin, ), FAN Jianzhong), HAO Bin), TIAN Xiaofeng), CHENG Junsheng), and ZHANG Jishan) ) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing , China ) International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang , China ) National Engineering and Technology Research Center for Nonferrous Metals Composites, General Research Institute for Nonferrous Metals, Bei-jing , China
文章页码：147 - 151
摘 要：Nanocrystalline Ni powders were successfully fabricated by mechanically milling at cryogenic temperature (cryomilling)with 1 wt.%Y2O3 particles. The experimental results have shown that the Ni grain size is reduced to 25 nm after 2 h of cryomilling in the presence of the Y2O3 particles. The cryomilled Ni/Y2O3 powders can maintain their nanocrystalline structure up to 900°C, or 62% of the melting point of Ni. A bulk nanocrystalline Ni/Y2O3 material with a thermally stable grain size of approximately 100 nm was produced by cryomilling, cold isostatic pressing, followed by hot isostatic pressing. The microhardness of bulk nanocrystalline Ni/1wt.%Y2O3 is 315 DPH, which is two times as high as that of conventional Ni.
YANG Bin1, 2), FAN Jianzhong3), HAO Bin1), TIAN Xiaofeng3), CHENG Junsheng1), and ZHANG Jishan1) 1) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China 2) International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China 3) National Engineering and Technology Research Center for Nonferrous Metals Composites, General Research Institute for Nonferrous Metals, Bei-jing 100088, China
摘 要：Nanocrystalline Ni powders were successfully fabricated by mechanically milling at cryogenic temperature (cryomilling)with 1 wt.%Y2O3 particles. The experimental results have shown that the Ni grain size is reduced to 25 nm after 2 h of cryomilling in the presence of the Y2O3 particles. The cryomilled Ni/Y2O3 powders can maintain their nanocrystalline structure up to 900°C, or 62% of the melting point of Ni. A bulk nanocrystalline Ni/Y2O3 material with a thermally stable grain size of approximately 100 nm was produced by cryomilling, cold isostatic pressing, followed by hot isostatic pressing. The microhardness of bulk nanocrystalline Ni/1wt.%Y2O3 is 315 DPH, which is two times as high as that of conventional Ni.
关键词：
