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Acta Physica Sinica (Overseas Edition), 1998, Vol. 7(7): 541-546    DOI: 10.1088/1004-423X/7/7/008
CROSS DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev  

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
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
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.
Received:  08 December 1997      Revised:  25 March 1998      Accepted manuscript online: 
PACS:  78.70.Dm (X-ray absorption spectra)  
  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)  
Fund: Project supported by the post-doctoral fund of the State Education Commission of China.

Cite this article: 

Liu Tao (刘涛), Hu Tian-dou (胡天斗), Xie Ya-ning (谢亚宁), Jiang Hai-yin (蒋海音), Wang De-wu (王德武), Wang Wen-dong (王文东), Li Hua-biao (李华飚) XRD AND EXAFS INVESTIGATION OF THE DECOMPOSITION OF Co-Cu SOLID SOLUTION PREPARED BY MELT SPINING 1998 Acta Physica Sinica (Overseas Edition) 7 541

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