Diffusionless crystal growth in a eutectic system during rapid solidification

Journal Article · Sat Jul 15 04:00:00 EDT 2006 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776106070168· OSTI ID:21067665

Herlach, D M ^[1]

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1. German Aerospace Center, Institute of Space Simulation (Germany)

Experiments on nonequilibrium rapid eutectic growth are surveyed. The applicability limits of the modern theoretical models describing rapid solidification of binary systems are assessed. A problem of rapid eutectic growth when the local equilibrium is violated in the solute diffusion field (in the bulk liquid and at the solid-liquid interface) is formulated. An analytical solution to the problem of rapid lamellar eutectic growth under local nonequilibrium conditions in the solute diffusion field is found. It is shown that the diffusion-limited growth of a eutectic pattern ceases as soon as a chemically homogeneous crystalline phase begins to grow when the critical point V=V{sub D} is achieved (V is the solid-liquid interface velocity and V{sub D} is the solute diffusion speed in the bulk liquid). At V {>=} V{sub D}, eutectic decomposition is suppressed and the nascent homogeneous crystalline phase has the initial (nominal) chemical composition of the binary system.

• OSTI ID: 21067665
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 1 Vol. 103; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANALYTICAL SOLUTION
CHEMICAL COMPOSITION
CRYSTAL GROWTH
DECOMPOSITION
DIFFUSION
EQUILIBRIUM
EUTECTICS
INTERFACES
LIQUIDS
SOLIDIFICATION
SOLIDS
SOLUTES