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Computer simulation of ledge migration under elastic interaction

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Abstract

The diffusional growth of a phase by the motion of disconnections (ledges which contain transformation or misfit dislocations) was studied by a finite difference computer model. The elastic stress of these dislocations is considered to alter the (local equilibrium) solute concentration at the riser of ledges and cause a complex diffusion field interaction among ledges as they migrate. In some cases, however, the ledges forming a train can migrate all at the same speed in the presence of elastic interaction. The condition under which ledges overcome the elastic barrier and form a multipleheight ledge was determined. The model was applied to the migration of ledges/Shockley partial dislocations at γ′-plate interfaces in Al-Ag alloys.

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Authors and Affiliations

  1. Department of Materials Science, Ibaraki University, 316, Hitachi, Japan

    Masato Enomoto (Professor)

  2. Department of Mechanical and Materials Engineering, Washington State University, 99164, Pullman, WA

    John P. Hirth (Professor)

Authors
  1. Masato Enomoto
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  2. John P. Hirth
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Additional information

This article is based on a presentation made during TMS/ASM Materials Week in the symposium entitled “Atomistic Mechanisms of Nucleation and Growth in Solids,” organized in honor of H.I. Aaronson’s 70th Anniversary and given October 3–5, 1994, in Rosemont, Illinois.

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Enomoto, M., Hirth, J.P. Computer simulation of ledge migration under elastic interaction. Metall Mater Trans A 27, 1491–1500 (1996). https://doi.org/10.1007/BF02649809

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