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Thermal Problems in Material processing of High-Temperature MaterialsIn this final report axial segregation in unsteady diffusion dominated directional solidification of a binary alloy with a planar solid-liquid interface profile is considered. The analysis is an extension of the work of Smith et al. to account for an arbitrary initial axial concentration profile. This situation is important in the experimental studies of growth of crystals in a microgravity environment in which the growth is from melts formed by re-melting crystals that have a known axial impurity profile. Three situations are discussed. There are the initial transient, a re-solidified crystal, and multipass solidification.
Document ID
19980200985
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Korpela, Seppo A. (Ohio State Univ. Columbus, OH United States)
Date Acquired
September 6, 2013
Publication Date
August 14, 1997
Subject Category
Engineering (General)
Report/Patent Number
NAS 1.26:208194
NASA/CR-97-208194
Funding Number(s)
CONTRACT_GRANT: NAG3-1308
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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