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Correlation between effective activation energy and pre-exponential factor for diffusion in bulk metallic glasses

Published online by Cambridge University Press:  31 January 2011

S. K. Sharma  and
F. Faupel
S. K. Sharma
Affiliation:
Technische Fakultät der Universität Kiel, Lehrstuhl f¨r Materialverbunde, Kaiserstraβe 2, D-24143 Kiel, Germany
F. Faupel*
Affiliation:
Technische Fakultät der Universität Kiel, Lehrstuhl f¨r Materialverbunde, Kaiserstraβe 2, D-24143 Kiel, Germany
*
b) Address all correspondence to this author.cgcq@hotmail.com
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Abstract

The values of effective activation energy (Q) and pre-exponential factor (D0) reported in the literature for diffusion in the novel bulk metallic glasses, both in the glassy and the deeply supercooled liquid regions, are found to follow the same correlation as reported earlier in conventional metallic glasses, namely D0 = A exp(Q/B), where A and B are fitting parameters with values A = 4.8 × 10−19 m2 s−1 and B = 0.056 eV atom−1. A possible explanation for the observed values of A and B is given by combining an activation energy and a free volume term. The interpretation favors a cooperative mechanism for diffusion in the glassy and deeply supercooled liquid states.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 8 , August 1999 , pp. 3200 - 3203
Copyright
Copyright © Materials Research Society 1999

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