A NEWLY DISCOVERED DIFFUSION MECHANISM IN SOLIDS──COMPLEX DIFFUSION MECHANISM

Acta Metall Sin

1994, Vol. 30

Issue (1): 7-10 DOI:

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A NEWLY DISCOVERED DIFFUSION MECHANISM IN SOLIDS──COMPLEX DIFFUSION MECHANISM

YU Zongsen;CHEN Ning(University of Science and Technology Beijing)(Manuscript received 21 June;1993)

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YU Zongsen;CHEN Ning(University of Science and Technology Beijing)(Manuscript received 21 June;1993). A NEWLY DISCOVERED DIFFUSION MECHANISM IN SOLIDS──COMPLEX DIFFUSION MECHANISM. Acta Metall Sin, 1994, 30(1): 7-10.

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Abstract Substitutional solute atoms are believed to difuse by means of solute atom-vacancy complexes.This mechanism could be used to explain some phenomena very well such as:the rule for occurring of non-equilibrium segregation,the anomalously fast diffusion phenomena of solute atoms,the boron's fast diffusion and non-equilibrium segregation of grain-boundary in γ-Fe,the segregation of solute atoms in vacancy-pits on aluminium surface and the precipitation of silicon in the grain-boundary of aluminium.Correspondent:YU Zongsen,professor,(Department of Materials Physics,Universiy of Science and Technology Beijing,Beijing,100083)

Key words: diffusion mechanism vacancy.solute atom non-equilibrium segregation

Received: 18 January 1994

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