高能球磨法制备纳米镍体材料的研究  

Study on Preparation of NanocrystalUne Nickel Bulk Material by High Energy Ball-milling

作　　者：戴华[1] 朱心昆[1] 黄素贞[1] 徐孟春[1] 李才巨[1] 

机构地区：[1]昆明理工大学材料与冶金工程学院金属材料工程系

出　　处：《材料导报》2007年第F11期40-42,50,共4页Materials Reports

摘　　要：主要研究了以纯镍粉(99.99%)为原料,采用高能球磨法制备纳米镍体材料。球磨得到的试样的平均晶粒尺寸在20.8～26.5nm;不同球料比的试样的显微硬度均存在一个相同的规律,即随着球磨时间的延长,显微硬度呈现出周期性硬化、软化趋势,且随着球磨的继续进行将最终趋于一个稳定值状态;平均显微硬度与晶粒尺寸之间也符合正Hall—Petch关系。In this study, nanocrystalline nickel bulk material is prepared by the method of high energy ball- milling using pure nickel powder（99.99%） as the raw material. The results indicate that the mean grain size of nc sample is between 20. 8nm to 26.5nm and there is a rule in samples with different ball-to-powder weight ratios between microhardness and ball-milling time, that is the microhardness is periodically strengthened and softened with the elonga- tion of ball-milling time and finally it would get to a steady state. And the relation between grain size and microhardness meet the Hall-Petch relation well.

关 键 词：纳米镍体材料 高能球磨法 显微硬度 晶粒尺寸Hall-Petch关系 

分 类 号：TB33[一般工业技术—材料科学与工程] TQ153.12[化学工程—电化学工业]