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Structural transition of Fe80Cu20 alloy induced by annealing

Yin Shi-Long Yan Wen-Sheng Fan Jiang-Wei Pan Zhi-Yun Wei Shi-Qiang Hao Lu-Yuan Li Yu-Zhi Liu Wen-Han

Structural transition of Fe80Cu20 alloy induced by annealing

Yin Shi-Long, Yan Wen-Sheng, Fan Jiang-Wei, Pan Zhi-Yun, Wei Shi-Qiang, Hao Lu-Yuan, Li Yu-Zhi, Liu Wen-Han
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  • Abstract views:  3062
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  • Received Date:  12 January 2005
  • Accepted Date:  18 July 2005
  • Published Online:  20 December 2005

Structural transition of Fe80Cu20 alloy induced by annealing

  • 1. (1)河海大学数学物理系,南京 210024; (2)中国科学技术大学国家同步辐射实验室,合肥 230029; (3)中国科学技术大学化学物理系,合肥 230026; (4)中国科学技术大学结构分析开放研究实验室,合肥 230026; (5)中国科学技术大学物理系,合肥 230026

Abstract: 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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