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Kinetics of the ζ to μ, Transformation in Ag-Al Alloys

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Abstract

The kinetics of the ζ → μ polymorphic transformation in Ag-24.0, 25.0, 26.0, and 27.0 at. pct Al alloys have been examined. The quenched ζ-phase transformed completely to the μ-phase on isothermal annealing within the μ-phase field. The transformation process exhibited an activation energy comparable to a short-range-diffusion controlled reaction. Decomposition of the quenched ζ within the (μ + ζ) two-phase field occurred by two processes. The surface transformed by the development of a product comparable to that obtained by transforming within the μ single phase field. The remaining bulk of the product transformed by the nucle-ation and growth of a long-range-diffusion controlled Widmanstätten product. No metastable extension of the boundary of the μ-phase was observed. The growth of the surface transfor-mation product terminated prior to the visible appearance of the Widmanstätten morphology.

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Authors and Affiliations

  1. University of British Columbia, Vancouver, British Columbia, Canada

    L. Cambal (Master’s Degree)

  2. Metallurgy Department, University of British Columbia, Canada

    E. B. Hawbolt (Assistant Professor)

Authors
  1. L. Cambal
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  2. E. B. Hawbolt
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Cambal, L., Hawbolt, E.B. Kinetics of the ζ to μ, Transformation in Ag-Al Alloys. Metall Trans 4, 1389–1394 (1973). https://doi.org/10.1007/BF02644537

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