机械合金化Fe100-xCux体系的结构

吉首大学学报（自然科学版） ›› 2002, Vol. 23 ›› Issue (1): 8-12.

机械合金化Fe_100-xCu_x体系的结构

(1.河海大学数理系，江苏南京 210024；2.中国科学技术大学国家同步辐射实验室，安徽合肥 230029)

出版日期:2002-03-15 发布日期:2013-01-05
作者简介:殷士龙(1947-)，男，江苏南京市人，河海大学数理系教授，主要从事功能材料微结构的研究.
基金资助:
国家自然科学基金资助项目(19604011)

XAFS and XRD Studies of Mechanically Alloyed Fe_100-xCu_x

(1.Dept.of Math.& Phys.,Univ.Hehai,Nanjing 210024,China；2.National Synchrotron Radiation Laboratory and Center for Fundamental Physics,University of Science and Technology of China,Hefei 230029,China)

Online:2002-03-15 Published:2013-01-05

摘要/Abstract

摘要：利用XAFS和XRD方法分别研究了机械合金化80 h制备的Fe_100-xCu_x 系统的晶体结构及Fe和Cu原子的局域配位环境.结果表明，当x＞40时，样品中Fe原子的bcc结构消失，Cu原子的近邻结构基本不变，fcc晶格参数随x的增加而减小；当x＜30时， Cu原子的fcc结构消失， Fe原子的近邻结构基本不变，bcc晶格参数随Cu原子的比例减小而增大；而x=30左右时，fcc和bcc结构共存.研究结果还表明， Fe原子和Cu原子的比例不是相差很大时，Fe原子和Cu原子的近邻配位无序度会在很大的范围内变化，说明Fe-Cu二元体系不可能形成均匀的过饱和固溶体，存在Cu富集区和Fe富集区，是由多种物态组成的混合物.

关键词： XRD, XAFS, 机械合金化

Abstract: The structures of the mechanically alloyed Fe_100-xCu_x (x=0,20,30,40,60,70,100) after milling for 80 hours were investigated by X-ray absorption fine structure (XAFS) and X-ray diffraction (XRD).When the weight ratio of the balls to the powder was 40:1,for the Fe_100-xCu_x (x≥40) alloys,the XRD results show that diffraction peaks of α-Fe disapeared,and only the diffraction peaks with fcc-like structure were observed.The fcc-like lattice parameter increases with Fe concentration.On the contrary,for the Fe_100-xCu_x (x＜30) alloys,only the diffraction peaks with bcc-like structure were observed.The bcc-like lattice parameter decreases with Cu concentration.The XAFS results show that the local structure evolution of Fe atoms was different from that of Cu atoms.The local structures around Fe atoms had been greatly changed and its disorder evidently increased,but the Cu atoms maintain the original structure geometry.So,mechanically alloyed Fe_100-xCu_x is not a homogeneous supersaturated solid solution and consists of Fe-rich and Cu-rich regions.

Key words: X-ray absorption fine structure, X-ray diffraction, mechanical alloying

殷士龙, 章佳伟, 韦世强. 机械合金化Fe_100-xCu_x体系的结构[J]. 吉首大学学报（自然科学版）, 2002, 23(1): 8-12.

YIN Shi-Long, ZHANG Jia-Wei, WEI Shi-Qiang. XAFS and XRD Studies of Mechanically Alloyed Fe_100-xCu_x[J]. Journal of Jishou University(Natural Sciences Edition), 2002, 23(1): 8-12.

参考文献

[1] BENJAMIN J S.Mechanical Alloying [J].Sci.Am.1976,234(5): 40-48.

[2] SCHULTZ L.Glass Formation by Mechanical Alloying[J].J.Less-Common Met.1998,145:233-249.

[3] KOCH C C, CAVIN O B,MCKAMEY C G.Preparetion of Amorphous Nickel-Niobium(Ni60Nb40) by Mech.Alloying[J].Appl.Phys.Lett.,1983,43(11):1 017-1 019.

[4] ECKERT J,BORNER I.Nanostructure Formation and Properties of Ball-milled NiAl Intermetallic Compound[J].Materials Science and Engineering A,1997,240: 619-624.

[5] SHINGU P H,ISHIHARA K N,Uenishi K,et al.Metastable Alloy Phase Formation by Repeated Rolling in Some Common Metallic Binary Alloy Systems[A]. Solid State Powder Proceeding[C] Kyoto,Japan: The Minerals Metals and Materials Society,1990.21-34.

[6] YAVARI A R,DESRE P J，BENAMEUR T.Mechanically Driven Alloying of Immiscible Elements[J].Phys.Rev.Lett.1992,68(14),2 235-2 238.

[7] CRESPO P, HERNANDO A，ESCORIAL A G.Spinodal Decomposition of Fe-Cu Nanocrystals: Control of Atomic-magnetic-moment and Magnetic Properties[J]. Phys.Rev.B ,1994,49(18): 13 227-13 230.

[8] SCHILLING P J,HE J H,TITTSWORTH R C,et al.Two-phase Coexistence Region in Mechanically Alloyed Cu-Fe: An X-ray Absorption Near-edge Structure Study[J]. Acta Mater.1999,47(8): 2 525-2 537.

[9] 韦世强，殷士龙.刘文汉，等.机械合金化Fe-Cu系统的EXAFS研究[J]. 物理学报,1994,43(10):1 630-1 637.

[10] WEI S Q,OYANAGI H,WEN C,et al.Metastable Structures of Immiscible FexCu100-x System Induced by Mechanical Alloying[J].J.Phys.- Condensed Matter,1997,50(9):11 077 -11 083.

[11] HUANG J Y, JIANG J Z,YASUDA H，et al.Kinetic Process of Mechanical Alloying in Fe50Cu50[J].Phys.Rev.B,1998,58(18):11 817-11 820.

[12] FRATTINI R,MULAS G,ENZO S,et al.A Study of Nanocrystalline Binary Fe80Cu20 and Multicomponent Fe81Cu1Si9B6Nb3 Alloys Prepared by Mechanical Alloying[J].Nanostructured Materials,1997,9:513-518.