Abstract
Dendritic growth, and the formation of material microstructure in general, necessarily involves a wide range of length scales from the atomic up to sample dimensions. The phase field approach of Langer, enhanced by optimal asymptotic methods and adaptive mesh refinement, copes with this range of scales, and provides an effective way to move phase boundaries. However, it fails to preserve memory of the underlying crystallographic anisotropy, and thus is ill-suited for problems involving defects or elasticity. The phase field crystal (PFC) equation—a conserving analogue of the Swift-Hohenberg equation—is a phase field equation with periodic solutions that represent the atomic density. It can natively model elasticity, the formation of solid phases, and accurately reproduces the nonequilibrium dynamics of phase transitions in real materials. However, the PFC models matter at the atomic scale, rendering it unsuitable for coping with the range of length scales in problems of serious interest. Here, we show that a computationally-efficient multiscale approach to the PFC can be developed systematically by using the renormalization group or equivalent techniques to derive appropriate coarse-grained coupled phase and amplitude equations, which are suitable for solution by adaptive mesh refinement algorithms.
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PACS numbers: 81.16.Rf, 05.10.Cc, 61.72.Cc, 81.15.Aa
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Goldenfeld, N., Athreya, B.P. & Dantzig, J.A. Renormalization Group Approach to Multiscale Modelling in Materials Science. J Stat Phys 125, 1015–1023 (2006). https://doi.org/10.1007/s10955-005-9013-7
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DOI: https://doi.org/10.1007/s10955-005-9013-7