Large-scale simulations of Ostwald ripening in elastically stressed solids: I. Development of microstructure

K. Thornton*, Norio Akaiwa, P. W. Voorhees

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

We present the results from large-scale simulations of Ostwald ripening of misfitting second-phase particles in an elastically anisotropic system. We employ the sharp interface description and perform simulations in two dimensions using boundary integral methods combined with state-of-the-art numerical methods such as the fast multipole method. We find that particle shapes are perturbed by elastic interactions at sufficiently large area fractions and particle sizes, and thus the shapes are not given by the equilibrium morphology of an isolated particle. Unlike isolated particles, the morphology transitions from fourfold to twofold shapes are not sharp, but are smeared due to interparticle interactions. However, for a very low area fraction system, the particles remain fourfold symmetric well beyond the bifurcation point, indicating that elastic interactions are essential in inducing a particle shape bifurcation. We find that the evolution of the microstructure is not scale invariant. However, the microstructure is unique, in a statistically averaged sense, for a given ratio of the elastic and interfacial energies.

Original languageEnglish (US)
Pages (from-to)1353-1364
Number of pages12
JournalActa Materialia
Volume52
Issue number5
DOIs
StatePublished - Mar 8 2004

Keywords

  • Alloys
  • Coarsening
  • Coherent precipitates
  • Phase transformations

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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