Pb nanoprecipitates in Al: Magic-shape effects due to elastic strain

J.C. Hamilton, F. Leoard, Erik Johnson, U. Dahmen

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    Abstract

    We present a theory for size-dependent shapes of Pb nanoprecipitates in Al, introducing the concept of "magic shapes," i.e., shapes having near-zero homogeneous elastic strains. Our quantitative atomistic calculations of edge energies show their effect on precipitate shape to be negligible, thus it appears that shapes must be due to the combined effect of strain and interface energies. By employing an algorithm for generating magic shapes, we replicate the experimental observations by selecting magic-shape precipitates with interfacial energies less than a cutoff value.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume98
    Issue number23
    Pages (from-to)236102
    ISSN0031-9007
    DOIs
    Publication statusPublished - 2007

    Bibliographical note

    Copyright 2007 American Physical Society

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