摘要
ＥＸＡＦＳ研究Ｆｅ－Ｃｕ系二元金属的Ｆｅ和Ｃｕ配位环境随球磨时间及组成的变化情况，结果表明机械合金化方法能扩展Ｆｅ和Ｃｕ金属的固溶范围并形成纳米尺寸的非平衡亚稳态合金晶粒，Ｆｅ＿（８０）Ｃｕ＿（２０）（１６０ｂ）中Ｃｎ的Ｋ吸收谱和ＲＳＦ出现ｂｃｃ结构的特征，其Ｆｅ－Ｃｕ的合金晶粒为ｂｃｃ结构；Ｆｅ＿（６０）Ｃｕ＿（４０）（１６０ｋ）中Ｃｕ和Ｆｅ的ＲＳＦ都为ｆｃｃ结构，其合金晶粒的结构与Ｆｅ＿（８０）Ｃｕ＿（２０）的不同，为ｆｃｃ结构，但合金晶粒中未形成均匀分散的Ｆｅ－Ｃｕ合金相是Ｃｕ略富积于核，Ｆｅ偏析于表面的亚稳态结构。
Abstract The EXAFS technique was used to study the changes of Fe and Cu atom ne-ighbor environment following the milling time and composition of Fe-Cu system.The resutls show that the range of Fe-Cu solid solution can be greatly extendedand can form nanometer sized non-equilibrium metastable alloy particles by mecha-nical alloying. For Fe_(80)Cu_(20)(160h), K-edge absorption curve and radial structurefunction of Cu are similar to that of α-Fe powder, has the bcc structural characte-ristics, the Fe-Cn alloy particles is bcc structure also. The structure of Fe-Cu alloyin Fe_(60)Cu_(40)(160h)is the fcc structure, it is different frorn that of Fe_(80)Cu_(20)(160h).In nanometer sized Fe-Cu metastable alloy particles of Fe_(60)Cu_(40)(160h), Cu and Feare not uniformly dispersed, Cu is a little richer in the core, but Fe is abundanton the surface.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第10期1630-1637,共8页
Acta Physica Sinica
基金
国家自然科学基金和中国科学技术大学青年基金
