Al_(60)Fe_(20)Cu_(20)纳米材料的结构研究  

Microstructure of nano-crystalline material Al_(60)Fe_(20)Cu_(20)

作　　者：钱丽英[1] 朱春祥[1] 李彩霞[1] 贺博[2] 刘庆华[2] 郝绿原[2] 殷士龙[3] 

机构地区：[1]河海大学电气工程学院,江苏南京210098 [2]中国科学技术大学化学物理系和国家同步辐射实验室,安徽合肥230029 [3]河海大学理学院,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2006年第2期235-238,共4页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金资助项目(10274077)

摘　　要：采用机械合金化方法制备了系列Al60Fe20Cu20纳米晶体样品,并对部分样品附加500℃快速退火处理.联合使用X射线衍射和X射线吸收精细结构技术,分别从晶体的长程有序和原子近邻配位的短程有序2个方面研究样品的结构相变.结果表明:样品中Al和Cu原子首先组成体心四方结构的Al2Cu金属间化合物,然后与Fe原子合金化,形成Cu和简立方晶体结构AlFe的固溶体,结构稳定但不均匀,Fe原子处于富集状态;即使附加500℃-5 min退火,Al60Fe20Cu20系统在40 h的机械合金化过程中不能形成准晶相;球磨30 h后,晶粒尺寸已达到20 nm左右.Al60Fe20Cu20 samples were prepared by mechanical alloying （MA）, and some of them were rapidly annealed at 500℃. Microstructure of milled products at different stages of milling was characterized by X-ray diffraction （XRD） and extended X-ray absorption fine structures （EXAFS）. The method overeame the difficulties in analysis of highly disordered structures. The results indicate that Al and Cu form inter-metallic compound Al2Cu with body-centered tetragonal structure at first, then Al2Cu alloys with Fe, and Al（Cu, Fe） of cubic crystal structure is formed. Al（Cu, Fe） is quite annealing of 5 minutes is added at 500℃, and that the nano-crystallite size is about 20 nm after milling for 30 h.

关 键 词：机械合金化 Al60Fe20Cu20 退火 X射线衍射 X射线吸收精细结构技术 

分 类 号：TF801[冶金工程—有色金属冶金]