OSTWALD RIPENING AND RELAXATION IN DENDRITIC STRUCTURES.

M. E. Glicksman*, P. W. Voorhees

*Corresponding author for this work

Research output: Contribution to journalConference article

39 Scopus citations

Abstract

The development of microstructures in cast materials is described as a sequence of processes among which are dendritic growth and coarsening. Dendritic evolution is analyzed as the deterministic formation of the tip and its neighborhood, followed by the incubation of stochastic events including Ostwald ripening and coalescence. Mean-field theories of coarsening are discussed briefly, and the problem of relating classical coarsening of convex spherical particles to that of highly branched dendritic interfaces is resolved by considering the distribution of chemical potentials over the solid-liquid surface. Experiments relying on stereological measurements yield kinetic coarsening experiments in reasonable agreement with statistical theories. The influence of volume fraction on the coarsening kinetics affects the rate constant which increases about four-fold when the solid fraction rises to 50 pct, but the coarsening exponent remains at the classical value of 1/3. Attempts to measure mean-field intensive thermodynamic properties such as temperature and concentration dendritic coarsening yield consistent kinetics. The application of morphological scaling laws is stressed.

Original languageEnglish (US)
Pages (from-to)995-1001
Number of pages7
JournalMetallurgical transactions. A, Physical metallurgy and materials science
Volume15 A
Issue number6
DOIs
StatePublished - Jun 1984
EventEstabl of Microstruct Spacing during Dendritic and Coop Growth - Atlanta, Ga, USA
Duration: Mar 7 1983Mar 7 1983

ASJC Scopus subject areas

  • Engineering(all)

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