中国物理B ›› 1998, Vol. 7 ›› Issue (7): 541-546.doi: 10.1088/1004-423X/7/7/008

• 8000 CROSSDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    

XRD AND EXAFS INVESTIGATION OF THE DECOMPOSITION OF Co-Cu SOLID SOLUTION PREPARED BY MELT SPINING

刘涛1, 胡天斗1, 谢亚宁1, 蒋海音1, 王德武1, 王文东2, 李华飚2   

  1. (1)Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Academia Sinica, Beijing 100039, China; (2)Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, China
  • 收稿日期:1997-12-08 修回日期:1998-03-25 出版日期:1998-07-20 发布日期:1998-07-20
  • 基金资助:
    Project supported by the post-doctoral fund of the State Education Commission of China.

XRD AND EXAFS INVESTIGATION OF THE DECOMPOSITION OF Co-Cu SOLID SOLUTION PREPARED BY MELT SPINING

Liu Tao (刘涛)a, Hu Tian-dou (胡天斗)a, Xie Ya-ning (谢亚宁)a, Jiang Hai-yin (蒋海音)a, Wang De-wu (王德武)a, Wang Wen-dong (王文东)b, Li Hua-biao (李华飚)b   

  1. a Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Academia Sinica, Beijing 100039, China; b Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, China
  • Received:1997-12-08 Revised:1998-03-25 Online:1998-07-20 Published:1998-07-20
  • Supported by:
    Project supported by the post-doctoral fund of the State Education Commission of China.

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摘要： High solid-solubility Co15Cu85 alloys were prepared by melt spining and then submitted to isothermal and anisothermal annealing to obtain granular alloys. The synchrotron radiation X-ray diffraction patterns and extended X-ray absorption fine structure (EXAFS) spectra were measured to investigate the decomposition of supersaturated solid solution upon annealing. Experimental results indicated the precipitation of ultrafine Co-rich particles occurred at about 500℃ and the annealing had a great influence on the middle-range order of Co atoms. While the fitted EXAFS spectra showed that the interfaces of Co precipitates seem to be enriched with vacancy-type defects, leading to distorted interfaces.

Abstract: High solid-solubility Co15Cu85 alloys were prepared by melt spining and then submitted to isothermal and anisothermal annealing to obtain granular alloys. The synchrotron radiation X-ray diffraction patterns and extended X-ray absorption fine structure (EXAFS) spectra were measured to investigate the decomposition of supersaturated solid solution upon annealing. Experimental results indicated the precipitation of ultrafine Co-rich particles occurred at about 500℃ and the annealing had a great influence on the middle-range order of Co atoms. While the fitted EXAFS spectra showed that the interfaces of Co precipitates seem to be enriched with vacancy-type defects, leading to distorted interfaces.

中图分类号:  (X-ray absorption spectra)

  • 78.70.Dm
81.05.Bx (Metals, semimetals, and alloys) 81.40.Ef (Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization) 64.75.-g (Phase equilibria) 81.30.Mh (Solid-phase precipitation)