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The Growth Kinetics and Shape Evolution of Precipitates Growing by the Ledge Mechanism

Published online by Cambridge University Press:  21 February 2011

Masato Enomoto ,
George Spanos  and
Robert A. Masumura
Masato Enomoto
Affiliation:
National Research Institute for Metals, 2–3–12, Nakameguro, Meguroku, Tokyo 153, Japan
George Spanos
Affiliation:
Physical Metallurgy Branch, Naval Research Laboratory, Washington, D.C. 20375–5000
Robert A. Masumura
Affiliation:
National Research Institute for Metals, 2–3–12, Nakameguro, Meguroku, Tokyo 153, Japan
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Abstract

The characteristics of ledge growth of precipitates are investigated by a previously developed finite-difference computer model. The plate lengthening simulation results which incorporate measured ledge heights and spacings are in reasonable agreement with the observed lengthening behavior of plates in Fe-C alloys. The simulation which takes into account the diffusion field interaction among multiple precipitates shows that a variety of precipitate morphologies actually observed can possibly be formed solely by the change in the extent of diffusion field overlap among ledges and/or neighboring precipitates. This overlap is in turn caused by changes in the solute supersaturation, distribution of ledge nucleation sites and ledge nucleation rates. A brief discussion is made of the relative growth kinetics of ledged and disordered interfaces.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 237: Symposium Ca – Interface Dynamics and Growth , 1991 , 119
Copyright
Copyright © Materials Research Society 1992

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