Modeling of free dendritic growth of succinonitrile-acetone alloys with thermosolutal melt convection

Q LI; C BECKERMANN

doi:10.1016/S0022-0248(01)02390-9

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Modeling of free dendritic growth of succinonitrile-acetone alloys with thermosolutal melt convection

Journal article

Peer reviewed

Modeling of free dendritic growth of succinonitrile-acetone alloys with thermosolutal melt convection

Q LI and C BECKERMANN

Journal of crystal growth, Vol.236(1-3), pp.482-498

2002

DOI: 10.1016/S0022-0248(01)02390-9

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Abstract

A stagnant film model of the effects of thermosolutal convection on free dendritic growth of alloys is developed, and its predictions are compared to available earth-based experimental data for succinonitrile–acetone alloys. It is found that the convection model gives excellent agreement with the measured dendrite tip velocities and radii for low solute concentrations. However, at higher solute concentrations the present predictions show some deviations from the measured data, and the measured (thermal) Peclet numbers tend to fall even below the predictions from diffusion theory. Furthermore, the measured selection parameter σ* is significantly above the expected value of 0.02 and exhibits strong scatter. It is shown that convection is not responsible for these discrepancies. Some of the deviations between the predicted and measured data at higher supercoolings could be caused by measurement difficulties. The systematic disagreement in the selection parameter for higher solute concentrations and all supercoolings examined, indicate that the theory for the selection of the dendrite tip operating state in alloys may need to be reexamined.

Materials Science

Physics

Whiskers and dendrites (growth, structure, and nonelectronic properties)

Exact sciences and technology

Condensed matter: structure, mechanical and thermal properties

Whiskers and dendrites (growth,structure, and nonelectronic properties)

Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation

Methods of crystal growth; physics of crystal growth

Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)

Cross-disciplinary physics: materials science; rheology

Details

Title: Subtitle: Modeling of free dendritic growth of succinonitrile-acetone alloys with thermosolutal melt convection
Creators: Q LI - Department of Mechanical and Industrial Engineering, The University of Iowa, 2412 Seamans Center., Iowa City, IA 52242, United States
C BECKERMANN - Department of Mechanical and Industrial Engineering, The University of Iowa, 2412 Seamans Center., Iowa City, IA 52242, United States
Resource Type: Journal article
Publication Details: Journal of crystal growth, Vol.236(1-3), pp.482-498
DOI: 10.1016/S0022-0248(01)02390-9
ISSN: 0022-0248
eISSN: 1873-5002
Publisher: Elsevier; Amsterdam
Language: English
Date published: 2002
Academic Unit: Mechanical Engineering
Record Identifier: 9984064107302771

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