From needle crystals to polycrystalline spherulites: A phase field study

L. Gránásy, T. Pusztai, G. Tegze, G. Tóth, J. A. Warren, J. F. Douglas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We discuss the formation of polycrystalline microstructures within the framework of a recently proposed phase field theory. The formation of spherulites is described by an extension of the model that incorporates branching with a definite orientational mismatch. This effect is introduced via a metastable minimum in the orientational free energy. Spherulites are an extreme example of polycrystalline growth, a phenomenon that results from the quenching of orientational defects (grain boundaries) into the solid as the ratio of the rotational to the translational diffusion coefficient is reduced, as is found at high undercoolings. It is demonstrated that a broad variety of spherulitic patterns can be recovered by changing only a few model parameters.

Original languageEnglish
Title of host publicationModeling of Casting, Welding and Advanced Solidification Processes - XI
Pages15-24
Number of pages10
Publication statusPublished - Dec 8 2006
EventModeling of Casting, Welding and Advanced Solidification Processes - XI - Opio, France
Duration: May 28 2006Jun 2 2006

Publication series

NameModeling of Casting, Welding and Advanced Solidification Processes - XI
Volume1

Other

OtherModeling of Casting, Welding and Advanced Solidification Processes - XI
CountryFrance
CityOpio
Period5/28/066/2/06

Keywords

  • Phase field theory
  • Polycrystals
  • Solidification
  • Spherulites

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Gránásy, L., Pusztai, T., Tegze, G., Tóth, G., Warren, J. A., & Douglas, J. F. (2006). From needle crystals to polycrystalline spherulites: A phase field study. In Modeling of Casting, Welding and Advanced Solidification Processes - XI (pp. 15-24). (Modeling of Casting, Welding and Advanced Solidification Processes - XI; Vol. 1).