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Studies of directionally solidified eutectic Bi/MnBi at low growth velocitiesThe (lambda-squared)(V) deviation for diffusion-only rod eutectic growth, where lambda is the interrod spacing and V is the growth velocity, was studied at growth velocities less than 5 cm/h in directionally solidified eutectic Bi-Mn (Bi/MnBi). At lower growth velocities, (V less than 0.5 cm/h) morphological instability occurred which resulted in nonaligned, irregularly dispersed MnBi fibers. The (lambda-squared)(V) relation was experimentally determined over a range of growth velocities between 0.1 and 50 cm/h, thermal gradients in the liquid at the liquid-solid interface that varied from 40 to 120 C/cm and solidification orientation with respect to the direction of gravity. Naturally induced, convective instabilities are suggested as a possible growth velocity limit for cooperative growth in the Bi-Mn and related alloy systems.
Document ID
19850035928
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Pirich, R. G.
(Grumman Solid State Physics and Chemistry Laboratory Bethpage, NY, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1984
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 15A
ISSN: 0360-2133
Subject Category
Metallic Materials
Accession Number
85A18079
Funding Number(s)
CONTRACT_GRANT: NAS8-32948
CONTRACT_GRANT: NAS8-32219
Distribution Limits
Public
Copyright
Other

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