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Spinodal decomposition of beta brass

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Abstract

An electron microscopy study has been carried out to determine the origin of diffuse satellite reflections appearing in the electron diffraction patterns of the metastable CsCl type phase in Cu-38.9 and Cu-47.3 at. pct Zn alloys. It has been shown that two different kinds of satellite reflections appear: one set arises because of spinodal decomposition at low temperatures near room temperature, and the other is related to a soft phonon mode. The observed basket weave microstructure is formed by a spinodal decomposition of the ordered phase. The spinodal curve in the ordered CsCl type phase is discussed on the basis of a regular solution model, and the morphology of the spinodally decomposed structure and its dependence on specimen thickness is discussed in terms of elastic energy. The spinodal product is characteristic of thin foils only, being found in elastically soft {100} specimens, but not in foils with {110} or {111} orientations. In comparison with previous observations, the present results indicate that thin foils in other β-phase materials may decompose spinodally, and the effect may be of general significance.

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Authors and Affiliations

  1. Institute of Scientific and Industrial Research, Osaka University, Osaka, Japan

    H. Kubo

  2. Department of Metallurgy and Mining Engineering and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 61801, Urbana, IL

    M. Wayman (Professor)

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  1. H. Kubo
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  2. M. Wayman
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formerly with the Department of Metallurgy and Mining Engineering and Materials Research Laboratory, University of Illinois.

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Kubo, H., Wayman, M. Spinodal decomposition of beta brass. Metall Trans A 10, 633–643 (1979). https://doi.org/10.1007/BF02658327

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  • DOI: https://doi.org/10.1007/BF02658327

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