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A Possible Mechanism For Atomic Transport in Amorphous Metals

Published online by Cambridge University Press:  10 February 2011

Leon D. Van Ee ,
Barend J. Tthijsse  and
Jilt Sietsma
Leon D. Van Ee
Affiliation:
Laboratory of Materials Science, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands
Barend J. Tthijsse
Affiliation:
Laboratory of Materials Science, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands
Jilt Sietsma
Affiliation:
Laboratory of Materials Science, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands
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Abstract

The diffusion process at a temperature just below the glass-transition temperature is studied in a computer model of amorphous Ni81B19. The observed diffusion events cause structural changes that are highly localized and are correlated with low-frequency localized vibrational modes. The excitation of such a mode can result in a “jump”, which is identical to the diffusion event. The jump has a cooperative character involving some tens of atoms and can be of a reversible or of an irreversible nature.

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References

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