Overview of geometric effects on coarsening of mushy zones

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Metallurgical Transactions, A

DOI:https://doi.org/10.1007/BF02648946· OSTI ID:237768

Marsh, S P ^[1]; Glicksman, M E ^[2]

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1. Naval Research Lab., Washington, DC (United States). Physical Metallurgy Branch
2. Rensselaer Polytechnic Inst., Troy, NY (United States). Materials Science and Engineering Dept.

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, S{sub v}. 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 mush zone. The effects of local interface shape, negative mean, and Gaussian curvatures and the appearance of inactive length scales 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.

• Sponsoring Organization: USDOE
• OSTI ID: 237768
• Journal Information: Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 3 Vol. 27; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
ALLOYS
CHEMICAL PROPERTIES
DENDRITES
DIFFUSION
ELECTRICAL PROPERTIES
FREE ENERGY
INTERFACES
KINETICS
LIQUID METALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
SOLIDIFICATION
SURFACE AREA
THERMODYNAMICS