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.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
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)
