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Growth kinetics of bainite plates and widmanstÄtten needles in theΒ′ phase of a Ag-45at. pct Cd alloy

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Abstract

The morphology of bainite plates and widmanstÄtten needles formed in the Β′ phase of a Ag-45 at. pet Cd alloy at temperatures 160 to 300‡C was studied by optical and scanning electron microscopy. Both precipitate forms were similar in appearance to precipitates reported for Cu-Zn alloys. The growth kinetics of both bainite plates and widmanstÄtten needles were measured by interrupted annealing and scanning electron microscopy. Using the bainite thickening kinetics measured at 160, 200 and 240‡C, the Frank-Zener model for growth of planar precipitates, and supersaturation data obtained from the Ag-Cd metastable phase diagram enabled the effective chemical diffusivities, Deff, to be calculated for the three transformation temperatures. The results were in good agreement with the expected diffusivities. The lengthening kinetics of bainite plates at 160‡C and of widmanstÄtten needles at 240‡C were analyzed using Trivedi’s model for diffusion-controlled growth. Deff obtained from the lengthening kinetics of the needles was in good agreement with the Deff value obtained from the thickening kinetics of the plates, indicating that widmanstÄtten needles lengthened and bainite plates thickened at a rate controlled by volume diffusion. Bainite plates lengthened only in the early stage of growth and at a rate approximately 180 times larger than that permitted by volume diffusion. Possible reasons for such behavior were discussed.

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Authors and Affiliations

  1. Department of Metallurgy, University of British Columbia, Vancouver, B.C., Canada

    M. M. Kostic (Graduate Student), E. B. Hawbolt (Associate Professor) & L. C. Brown (Professor)

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  1. M. M. Kostic
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  2. E. B. Hawbolt
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  3. L. C. Brown
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Kostic, M.M., Hawbolt, E.B. & Brown, L.C. Growth kinetics of bainite plates and widmanstÄtten needles in theΒ′ phase of a Ag-45at. pct Cd alloy. Metall Trans A 7, 1643–1653 (1976). https://doi.org/10.1007/BF02817881

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