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Thermoelectric and morphological effects of Peltier pulsing on directional solidification of eutectic Bi-MnExtensive in situ thermal measurements using Peltier Interface Demarcation (PID) during directional solidification of eutectic Bi/MnBi were carried out. Observations indicate that significant thermal transients occur throughout the sample as a result of the Peltier pulsing. The contributions of the Peltier, Thomson, and Joule heats were separated and studied as a function of pulse intensity and polarity. The Joule and the combined Peltier and Thomson thermal contributions were determined as a function of time during and after the current pulses, close to the solid/liquid interface. Variations of the Bi/MnBi particle morphology clearly reveal the interface shape, changes in interface velocity, meltback, and temporary loss of cooperative growth, as a result of the pulsing.
Document ID
19850035929
Document Type
Reprint (Version printed in journal)
Authors
Silberstein, R. P. (Grumman Aerospace Corp. Bethpage, NY, United States)
Larson, D. J., Jr. (Grumman Aerospace Corp. Bethpage, NY, United States)
Dressler, B. (Grumman Research and Development Center 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
Funding Number(s)
CONTRACT_GRANT: NAS8-32948
Distribution Limits
Public
Copyright
Other