Study of local environment of Cu atoms in Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9 alloy with different annealing temperature  

作　　者：ZHANG Yu YANG Ying WANG YuXin LU Wei YAN Biao 

机构地区：[1]School of Materials Science and Engineering, Tongji University [2]Shanghai Key Lab. of D&A for Metal-Functional Materials [3]Department of Chemical&Materials Engineering, the University of Auckland,PB 92019, Auckland 1142, New Zealand

出　　处：《Science China(Physics,Mechanics & Astronomy)》2013年第10期1887-1891,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51071109);the Young Excellent Talents in Tongji University(Grant No.2009KJ003)

摘　　要：The local environment of Cu atoms in Fe73.5Cu1Nb3Si13.5B9 alloy was investigated by extended X-ray absorption fine structure(EXAFS).Cu clusters began to order when the annealing temperature was around 733 K from the results of the Fourier transform curves.The fitting results showed that the first shell of the near fcc(face-centered cubic)Cu clusters only contained Cu atoms.The coordination number increased with the annealing temperature.Subsequently,the occupancy rate increased from 33.3%(annealed at 733 K)to 100% (annealed at 853 K).This local structural change of Cu atoms could probably affect the distribution of the bcc(body-centered cubic)α-Fe in Fe73.5Cu1Nb3Si13.5B9 alloy.The local environment of Cu atoms in Fe73.5Cu1Nb3Si13.5B9 alloy was investigated by extended X-ray absorption fine structure （EXAFS）. Cu clusters began to order when the annealing temperature was around 733 K from the results of the Fourier trans- form curves. The fitting results showed that the first shell of the near fcc （face-centered cubic） Cu clusters only contained Cu atoms. The coordination number increased with the annealing temperature. Subsequently, the occupancy rate increased from 33.3% （annealed at 733 K） to 100% （annealed at 853 K）. This local structural change of Cu atoms could probably affect the distribution of the bcc（body-centered cubic） α-Fe in Fe73.5Cu1Nb3Si13.5B9 alloy.

关 键 词：extended X-ray absorption fine structure Cu clusters average coordination number occupancy rate 

分 类 号：TG156.2[金属学及工艺—热处理] TB383.1[金属学及工艺—金属学]