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Surface Energy and Microstructure

Published online by Cambridge University Press:  25 February 2011

Robert V. Kohn  and
Stefan MÜtller
Robert V. Kohn
Affiliation:
Courant Institute, 251 Mercer Street, NY, NY 10012, USA
Stefan MÜtller
Affiliation:
Universität Bonn, Institut für Angewandte Mathematik, Beringstr. 4, D-5300 Bonn 1, Germany
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Abstract

Bulk energy considerations can predict the gross features of microstructures observed in martensitic phase transitions, but not finer details such as the length scale on which twinning occurs. These are determined by surface energy. A standard approach is to minimize the sum of bulk and surface energy within the class of “twinned” configurations. This leads to the conclusion that the twin width w and the twin length L should satisfy w ∼L∼. While that seems to be the rule, a different structure is sometimes observed, for example in In-Tl and Cu-Al-Ni. It involves successive coarsening of the twins away from an austenite/twinned-martensite interface.

We re-examine the minimization of bulk plus surface energy. Our analysis differs from prior ones in that it permits configurations which are not essentially “onedimensional” to compete in the minimization. We find that the global minimum of energy can be either “one-dimensional” or “branched,” depending on the relative values of the elastic moduli and surface energy density.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 246: Symposium M – Shape-Memory Materials and Phenomena--Fundamental Aspects and Applications , 1991 , 19
Copyright
Copyright © Materials Research Society 1992

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References

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