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Diffusional Asymmetry in Amorphous Alloys:Implications for Interfacial Reactions

Published online by Cambridge University Press:  21 February 2011

A.L. Greer ,
K. Dyrbye ,
L.-U. Aaen Andersen ,
R. E. Somekh ,
J. Bøtiger  and
J. Janting
A.L. Greer
Affiliation:
University of Cambridge, Department of Materials Science and Met allurgy, Pembroke Street. Cambridge CB2 3QZ, U.K.
K. Dyrbye
Affiliation:
University of Cambridge, Department of Materials Science and Met allurgy, Pembroke Street. Cambridge CB2 3QZ, U.K.
L.-U. Aaen Andersen
Affiliation:
University of Aarhus, Institute of Physics, DK-8000 Aarhus C, Denmark.
R. E. Somekh
Affiliation:
University of Cambridge, Department of Materials Science and Met allurgy, Pembroke Street. Cambridge CB2 3QZ, U.K.
J. Bøtiger
Affiliation:
University of Aarhus, Institute of Physics, DK-8000 Aarhus C, Denmark.
J. Janting
Affiliation:
University of Aarhus, Institute of Physics, DK-8000 Aarhus C, Denmark.
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Abstract

Earlyllate transition metal systems such as Ni-Zr and Co-Zr exhibit solid state amorphization (SSA) in which the amorphous phase is formed by reaction between the crystalline elements. The rate of the amorphization is governed by the diffusion of the faster species, Ni or Co. Here results are presented on the homogenization of compositionally modulated thin films which show that the Zr diffusion is up to 106 times slower. The difference in diffusivities is correlated with atomic size. The consequences of the marked diffusional asymmetry are considered, particularly for the interpretation of results on the indiffusion of Co into amorphous Co-Zr. It is proposed that for amorphous alloys such as Ni-Zr and Co-Zr, changes in composition by rapid diffusion of Ni or Co can yield structures which are not in internal equilibrium. This would affect, for example, the validity of the common tangent construction as applied to predict the limiting compositions of the amorphous phase in contact with the elemental layers during SSA.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 187: Symposium J – Thin Film Structures and Phase Stability , 1990 , 3
Copyright
Copyright © Materials Research Society 1990

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