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Activation energies for the coarsening of compound precipitates

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Abstract

The theory of diffusion-controlled coarsening is extended to the case of compound precipitates of the typeA αBβ growing in a matrix of a third elementM. The bulk of the existing theory for coarsening in binary systems is found to apply in this case as well. The rate constant for coarsening is conveniently expressed as a preexponential term and an activation energy. Although the activation energy is dependent on the activation energy for diffusion of one or the other components, other terms are involved. In general, the activation energy for coarsening is considerably greater than the activation energy for diffusion. Rules are presented for deducing the coarsening rate from atomic mobilities, thermo-chemical data, alloy composition, and coarsening atmosphere.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, Massachusetts Institute of Technology, Cambridge, Mass.

    S. K. Bhattacharyya (Staff Member, Division of Sponsored Research) & K. C. Russell (Associate Professor)

Authors
  1. S. K. Bhattacharyya
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  2. K. C. Russell
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This paper is based upon a thesis submitted by S. K. BHATTACHARYYA in partial fulfillment of the degree of Doctor of Science at M.I.T.

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Bhattacharyya, S.K., Russell, K.C. Activation energies for the coarsening of compound precipitates. Metall Trans 3, 2195–2199 (1972). https://doi.org/10.1007/BF02643232

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