Open AccessStructural transition of Fe80Cu20 alloy induced by annealing
Author(s) -
Wensheng Yan,
Yin Shi-Long,
Fan Jiang-Wei,
Yuzhi Li,
Wenhan Liu,
Hao Luyuan,
Pan Zhi-Yun,
Wei Shi-Qiang,
()河海大学数学物理系，南京 ; ()中国科学技术大学国家同步辐射实验室，合肥 ; ()中国科学技术大学化学物理系，合肥 ; ()中国科学技术大学结构分析开放研究实验室，合肥 ; ()中国科学技术大学物理系，合肥
Publication year - 2005
Publication title -
acta physica sinica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.54.5707
Subject(s) - annealing (glass) , alloy , materials science , lattice constant , metastability , extended x ray absorption fine structure , crystallography , copper , cubic crystal system , diffraction , atmospheric temperature range , analytical chemistry (journal) , metallurgy , absorption spectroscopy , chemistry , thermodynamics , physics , chromatography , organic chemistry , quantum mechanics , optics
The extended x-ray absorption fine structure (EXAFS) and x-ray diffraction (XRD) techniques have been used to study the dependence of structural changes on annealing temperature for metastable body centered cubic (bcc) Fe80Cu20 alloy synthesized by mechanical alloying. In the temperature range from 300 to 873 K, the lattice constant of the bcc-structured phase exhibits a nearly linear decrease with the increase of annealing temperature. This is mainly due to the segregation of Cu atoms from the bcc Fe80Cu20 alloy to form the face centered cubic (fcc) Cu phase. Annealing at 603 K results in an increase of the average Cu—Cu distance RCu—Cu by about 0.003 nm, and about 50% Cu atoms are segregated from the bcc Fe80Cu20 alloy. After annealing at 773K, two phases of bcc α-Fe and fcc-Cu are almost completely separated from the as-milled bcc Fe80Cu20 alloy.
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