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Long-range ordering in the early stages of precipitation—a brief review

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Abstract

Local order adjusts more rapidly than long-range order for several reasons, and this local order need not mimic the low-temperature precipitate (although it does in many cases). This may drastically alter the activation energy for nucleation. Strain energy can play a key role in determining whether precipitation, ordering, or a displacive transformation occurs and in determining not only the shape but also the compositions of the phases. Long-range ordering in the matrix may develop prior to precipitation of an ordered phase. A plate-like morphology for ordered precipitates can occur for several reasons,e.g. strain, anisotropic interfacial energy, or planar antiphase boundaries in an ordered matrix.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, School of Engineering and Applied Science, Northwestern University, 60208, Evanston, IL

    J. B. Cohen

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  1. J. B. Cohen
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Additional information

This article is based on a presentation made at the Pacific Rim Conference on the “Roles of Shear and Diffusion in the Formation of Plate-Shaped Transformation Products,” held December 18-22, 1992, in Kona, Hawaii, under the auspices of ASM INTERNATIONAL’S Phase Transformations Committee.

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Cohen, J.B. Long-range ordering in the early stages of precipitation—a brief review. Metall Mater Trans A 25, 2565–2568 (1994). https://doi.org/10.1007/BF02649209

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