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Grain Boundaries in a 2-D Superlattice

Published online by Cambridge University Press:  26 February 2011

P. Cenedese ,
R. Kikuchi  and
J.W. Cahn
P. Cenedese
Affiliation:
Department of Materials Science and Engineering, and Advanced Materials Technology Program, Washington Technology Center University of Washington, Seattle, WA 98195
R. Kikuchi
Affiliation:
Department of Materials Science and Engineering, and Advanced Materials Technology Program, Washington Technology Center University of Washington, Seattle, WA 98195
J.W. Cahn
Affiliation:
And NBS, Gaithersburg, MD 20899
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Abstract

In bicrystals with CSL orientation relationships two kinds of coincidence site lattices form, resulting in two kinds of grain boundaries. We examine the thermodynamic properties, using a lattice gas model, and make microstructural predictions about the dihedral angles at junctions between these boundaries. The behavior of these boundaries is examined for low temperatures and through the critical disordering temperature. Some aspects of nonstoichiometry are presented. A wetting transition is found at low temperatures, in which one kind of grain boundary is converted into the other by expelling antiphase domain boundary. No wetting transition is found at the critical temperature because an unusually high critical exponent of 3 is found for the difference in grain boundary energies between the symmetric and antisymmetric cases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 231
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

1. Cahn, J.W. and Hilliard, J.E., J. Chem. Phys. 28, 258 (1958).Google Scholar
2. Kikuchi, R. and Cahn, J.W., J. Chem. Phys. 23, 137 (1962).Google Scholar
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4. Kikuchi, R. and Calm, J.W., “Melting and Impurity Adsorption on CSI. Grain Boundaries Between 2-Dimensional Crystals,” in this volume, and references therein.Google Scholar