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An Order-Wave Description of the Kinetics of Spinodal Ordering

Published online by Cambridge University Press:  21 February 2011

R. C. Cammarata ,
A. L. Greer  and
C. J. Lobb
R. C. Cammarata
Affiliation:
Div. of Applied Sciences, Harvard University, Cambridge, MA 02138, U.S.A.
A. L. Greer
Affiliation:
Div. of Applied Sciences, Harvard University, Cambridge, MA 02138, U.S.A.
C. J. Lobb
Affiliation:
Div. of Applied Sciences, Harvard University, Cambridge, MA 02138, U.S.A.
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Extract

Several authors have modeled the order-disorder transformation as a continuous process, not occurring by nucleation and growth. Their approaches are based either on treating the transformation as a second-order chemical reaction [1,2], or on discrete formulations of the phenomenological diffusion equations [3–8]. Extending the work of Gorsky [9] and of Bragg and Williams [10], Dienes [2] used the chemical reaction model with absolute reaction rate theory to derive numerically the time-dependence of the longrange order parameter. As his thermodynamic model he used the Bragg-Williams (B-W) approximation, assuming that the solid was uniformly ordered and ignoring inhomogeneity effects such as the excess interface and coherency strain energies that arise if antiphase domains exist.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 571
Copyright
Copyright © Materials Research Society 1984

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References

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