Overview of Geometric Effects on Coarsening of Mushy Zones View Full Text


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Article Info

DATE

1996-03

AUTHORS

S. P. Marsh, M. E. Glicksman

ABSTRACT

An overview is presented of the thermodynamic, kinetic, statistical, and geometric factors that govern phase coarsening in dendritic mushy zones. The coarsening behavior of such systems is best quantified through the kinetics of the decay rate of the specific surface area,Sv. The geometry of the complex solid-melt interfaces comprising a mushy zone is described statistically as an areal distribution of local curvature parameters. These parameters capture both the intensive and extensive thermodynamic characteristics of the mushy zone. The effects of local interface shape, negative mean, and Gaussian curvatures and the appearance of inactive lengthscales on the coarsening kinetics of dendritic structures are discussed. The combined contribution of all these geometrical effects yields global coarsening rates for ramified mushy zones that are comparable to those predicted from theory for a collection of spherical particles having the identical volume fraction of solid. More... »

PAGES

557-567

References to SciGraph publications

  • 1988-11. Ostwald ripening in a system with a high volume fraction of coarsening phase in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1992-02. Mushy zone modeling with microstructural coarsening kinetics in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1981-01. Microstructural development and evolution in liquid-phase sintered Fe-Cu alloys in JOURNAL OF MATERIALS SCIENCE
  • 1975-01. The dendrite arm spacings of aluminum-copper alloys solidified under steady-state conditions in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1984-06-01. Ostwald Ripening and Relaxation in Dendritic Structures in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1985-01. The theory of Ostwald ripening in JOURNAL OF STATISTICAL PHYSICS
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    http://scigraph.springernature.com/pub.10.1007/bf02648946

    DOI

    http://dx.doi.org/10.1007/bf02648946

    DIMENSIONS

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