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FINE STRUCTURE CHANGES OF IMMISCILE Cu-Fe SYSTEM DURING MECHANICAL ALLOYING

Huang Jianyu Wu Yukun He Anqiang Hu Kuiyi Meng Xiangmin(Laboratory of Atomic Imaging of Solids and Laboratory of Rapidly SolifiedNon- Equilibrium Alloys, Institute of Metal Research, Academia Sinica, Shenyang)  
Supersaturated solid solutions have been obtained in Cu- Fe system which are immiscible at room tempera-ture. The fee phase range has been extend to X 35at.%. High resolution electron microscope images show that there exist N- W orientation relationships,i.e. 〈001〉_α//〈110〉_γ and〈110〉_α//〈111〉_γ between bee phase and fee phase after 3 h milling, which suggests that reverse martensitic transformation has occurred during mechani-cal alloying and the extension of fee phase range is closely related to this transformation. The formation of lay-ered structure was also observed. After 60 h mechanical alloying homogenous nanocrystals with particle size about 10-20 nm are formed.
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