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Tracer Diffusion in Amorphous NI-ZR Alloys

Published online by Cambridge University Press:  21 February 2011

H.-M. Wu ,
H. Hahn  and
R.S. Averback
H.-M. Wu
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL. 61801
H. Hahn
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL. 61801
R.S. Averback
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL. 61801
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Abstract

Tracer impurity diffusion coefficients for Co and Hf were measured in a series of amorphous NixZr(1−x) alloys in the range 0.30 < × < 0.70 and at temperatures between 250°C and 350° C. The diffusion coefficients for the Co atoms are between 2 and 4 orders of magnitude greater than those for Hf depending on alloy composition and temperature. Diffusion coefficients for Hf are independent of alloy composition, whereas those for Co decrease strongly with increasing Ni content. The activation enthalpies of diffusion and the pre-exponential factors were both found to be significantly smaller for the Hf than the Co tracer impurity atoms. These results are discussed in terms of possible diffusion mechanisms in amorphous metallic alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 187: Symposium J – Thin Film Structures and Phase Stability , 1990 , 27
Copyright
Copyright © Materials Research Society 1990

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