Modulation mechanism for first-order transformations with nonconserved order parameters

A. Umantsev*, G. B. Olson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The effect of energy conservation on the decomposition dynamics of unstable states is considered for systems with nonconserved order parameters. We demonstrate that close to the critical point of instability the dynamics of the order parameter field is described by the nonlinear Cahn-Hilliard equation, leading to microstructure evolution by heat-transfer-controlled modulation. The results are applied to first-order displacive transitions, predicting an alternative transformation mechanism that follows a path of continuous strain modulation with finite wavelength.

Original languageEnglish (US)
Pages (from-to)R6132-R6135
JournalPhysical Review A
Issue number10
StatePublished - 1992

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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