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Phase field approach to structural changes at the nanoscale

Valery Levitas (Iowa State University)

Prager Medal Symposium in honor of George Weng: Micromechanics, Composites and Multifunctional Materials

Wed 10:45 - 12:15

MacMillan 117

Our recent results on the following basic problems of phase field theory and finite element simulations will be presented. They include: 1. Multivariant martensitic phase transformations, twinning, and dislocation evolution at large strains: surface tension, and quasi-static and dynamic problems on microstructure evolution. 2. Interaction between phase transformations and dislocations. 3. Surface-induced phenomena: pre-melting, multivariant martensitic transformations, barrierless nucleation, scale effects, and morphological transitions. 4. Phase transformations within an interface: barrierless nucleation and intermediate structures. [1] Levitas V. I., Levin V. A., Zingerman K. M., Freiman E. I., Physical Review Letters, 2009, 103, 025702. [2] Levitas V.I. and Javanbakht M. Physical Review Letters, 2010, 105, 165701. [3] Levitas V.I. and Javanbakht M. Physical Review Letters, 2011, 107, 175701 [4] Levitas V.I. and Javanbakht M. Phys. Rev. B, 2012, 86, 140101(R) [5] Levitas V.I. and Samani K. Nature Communications, 2011, 2, 284. [6] Levitas V.I. Phys. Rev. B, 2013, 87, 054112. [7] Levitas V.I. Int. J. Plasticity, 2013, 10.1016/j.ijplas.2013.03.002. [8] Levitas V.I. Acta Materialia, 2013 (in press).