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Characterization of a massive transformation by microstructural analysis

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Abstract

Quantitative metallography was employed to investigate experimentally the nucleation behavior and growth rates in a quenched Ag + 50 at. pct Cd alloy undergoing an isothermal massive transformation at 373 K (100 °C). The experimental characterization of the massively transforming microstructure as a function of time was accomplished by the stereological measurement of the microstructural variables, Vv, the volume fraction transformed, Sv, the parent/daughter interfacial area density, and λmax, the largest intercept-free nodule length of the newly forming daughter phase. These data were compared to statistically derived geometrical models of the microstructure formulated on various nucleation and growth premises and expressed in terms of these same variables. A model was found which matched the data in all respects, and this allowed certain nucleation characteristics, the interface migration rates, and the nodule shapes of the daughter phase to be deduced.

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Authors and Affiliations

  1. Naval Research Laboratory, 20375-5000, Washington, DC

    R. A. Vandermeer (Branch Consultant) & B. B. Rath (Associate Laboratory Director)

Authors
  1. R. A. Vandermeer
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  2. B. B. Rath
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Additional information

This article is based on a presentation made during TMS/ASM Materials Week in the symposium entitled “Atomistic Mechanisms of Nucleation and Growth in Solids,” organized in honor of H.I. Aaronson’s 70th Anniversary and given October 3–5, 1994, in Rosemont, Illinois.

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Vandermeer, R.A., Rath, B.B. Characterization of a massive transformation by microstructural analysis. Metall Mater Trans A 27, 1513–1518 (1996). https://doi.org/10.1007/BF02649811

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