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An electron microscopy study of precipitation in Cu-Ti sideband alloys

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Abstract

Electron transmission microscopy and diffraction have revealed directly the fine-scale precipitation processes and the mechanism of formation of the periodic microstructures which characterize the decomposition of Cu-Ti “sideband” alloys. The initial stages of decomposition involve the development of «100» compositional waves giving rise to the well-known sideband or satellite reflections along the «100» directions. This «wave-like» clustering producing a triaxially modulated structure involves the formation of two disordered phases; ordering does not accompany the initial clustering. Prolonged aging produces a periodic array of interpenetrating rods along the «100» directions of the matrix. During aging the periodic structures coarsen according to a t1/3 law. The experimental activation energy for the coarsening of the modulated structures is approximately 48 kcal/ mole. Maximum strength is associated with the formation of the transition phase β’ which forms byin situ transformation of the titanium-rich regions; this transformation is not accompanied by a loss of coherency in the modulated structures at the aging temperatures studied in this investigation. It is suggested that these periodic structures arise from spinodal decomposition.

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Authors and Affiliations

  1. Westinghouse Research and Development Center, Pittsburgh, Pa

    J. A. Cornie (Senior Engineer)

  2. Department of Metallurgical and Materials Engineering, University of Pittsburgh, 15213, Pittsburgh, Pa.

    A. Datta (Graduate Research Assistant) & W. A. Soffa (Associate Professor)

Authors
  1. J. A. Cornie
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  2. A. Datta
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  3. W. A. Soffa
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Cornie, J.A., Datta, A. & Soffa, W.A. An electron microscopy study of precipitation in Cu-Ti sideband alloys. Metall Trans 4, 727–733 (1973). https://doi.org/10.1007/BF02643081

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  • DOI: https://doi.org/10.1007/BF02643081

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