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Convection and morphological stability during directional solidificationFor growth of a vicinal face at constant velocity, the effect of anisotropic interface kinetics on morphological stability is calculated for a binary alloy. The dependence of the interface kinetic coefficient on crystallographic orientation is based on the motion and density of steps. Anisotropic kinetics give rise to traveling waves along the crystal-melt interface, and can lead to a significant enhancement of morphological stability. The stability enhancement increases as the orientation approaches a singular orientation and as the solidification velocity increases. Shear flows interact with the traveling waves and, depending on the direction of the flow, may either stabilize or destabilize the interface. Specific calculations are carried out for germanium-silicon alloys.
Document ID
19950008134
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Coriell, Sam R.
(National Inst. of Standards and Technology Gaithersburg, MD, United States)
Chernov, A. A.
(National Inst. of Standards and Technology Gaithersburg, MD, United States)
Murray, Bruce T.
(National Inst. of Standards and Technology Gaithersburg, MD, United States)
Mcfadden, G. B.
(National Inst. of Standards and Technology Gaithersburg, MD, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1994
Publication Information
Publication: NASA. Lewis Research Center, Second Microgravity Fluid Physics Conference
Subject Category
Metallic Materials
Accession Number
95N14548
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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