Domain Dynamics in a Ferroelastic Epilayer on a Paraelastic Substrate

[+] Author and Article Information
Y. F. Gao, Z. Suo

Mechanical and Aerospace Engineering Department and Princeton Materials Institute, Princeton University, Princeton, NJ 08544

J. Appl. Mech 69(4), 419-424 (Jun 20, 2002) (6 pages) doi:10.1115/1.1469000 History: Received March 15, 2001; Revised December 22, 2001; Online June 20, 2002
Copyright © 2002 by ASME
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Broken symmetry and lattice mismatch. The substrate has square symmetry. The epilayer has rectangular symmetry, with two variants.
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Schematic illustration of elastic refining; (a) a single-variant epilayer, (b) a two-variant epilayer with appropriate forces applied around the new domain, (c) the external forces removed
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A domain pattern in the epilayer constrained on the substrate
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The Landau expansion as a function of the order parameters. The four wells correspond to spontaneous states.
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Domain wall shape. The domain width is on the order of b.
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Free energy versus domain spacing. Without substrate constraint, the energy decreases as the domain size increases. With substrate constraint, the energy reaches a minimum at a specific domain size.
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Comparison of domain evolution in simulations with substrate constraint and without. The left column is the result with substrate, and parallel domains can be seen. The right column is the result without constraint, and the structure keeps coarsening.




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