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Neutron Scattering Study of Dynamical Scaling Properties in the Relaxation of Short-Range Clustering and Decomposition of Cuni(Fe) Alloys

Published online by Cambridge University Press:  21 February 2011

J. Aalders ,
C. Van Dijk  and
S. Radelaar
J. Aalders
Affiliation:
Netherlands Energy Research Foundation, ECN, P.O. Box 1, 1755 ZG Petten, The Netherlands.
C. Van Dijk
Affiliation:
Netherlands Energy Research Foundation, ECN, P.O. Box 1, 1755 ZG Petten, The Netherlands.
S. Radelaar
Affiliation:
Laboratory of Metallurgy, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands.
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Abstract

A neutron scattering study on a number of CuNi(Fe)-alloys has been undertaken in order to test some recent theories on the relaxation of short-range clustering and decomposition with special emphasis on scaling properties. The structure functions S(k,t), have been determined for samples, which had undergone a large number of different heat treatments resulting in different thermodynamic states. The analysis of the structure functions during relaxation of short-range clustering showed that even in these cases the assumption of small concentration fluctuations made in Cook's theory for spinodal decomposition is not always valid. Moreover, for the relaxation of short-range clustering and the very early stages of decomposition no scaling behaviour could be found. However, for some particular cases close to the spinodal, after a certain transient time, the structure function could be transformed into a time-independent function.

The main conclusion is that the kinetics of relaxation above as well as within the miscibility gap show similar characteristics, but there is no universal description applicable to all different regimes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 563
Copyright
Copyright © Materials Research Society 1984

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References

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