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Directional solidification and characterization of near eutectic Sm2CO17/Co alloysThe effects of directional solidification processing on the microstructural, compositional, and magnetic properties of near eutectic Co-Sm alloys (about 9 at. pct Sm) have been studied. Initial investigations have been performed at modest thermal gradients in the liquid, G(L) less than 60 C/cm and over a range of furnace (solidification) velocities, V = 0.8 45.4 cm/h. The primary dendrite spacing for near eutectic Sm2Co17/Co scaled with 1/sq rt V and varied from about 50 microns for V greater than or equal to 20 cm/h to hundreds of microns for V less than 10 cm/h, while the rod eutectic diameter and interrod spacing were an order of magnitude smaller. For both dendritic and cooperative growth, the associated permanent magnet properties were rather poor, e.g., remanence less than 4 kG and coercive force less than 1 kOe for the smallest dendrite and rod diameter dimensions encountered, although the magnetic hardness for the rod eutetic was larger than for the dendritic microstructure. Magnetization as a function of sample orientation indicated that the easy axis of magnetization was primarily along the direction of solidification for both ferromagnetic phases.
Document ID
19870036572
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Pirich, Ronald G.
(Grumman Corporate Research Center Bethpage, NY, United States)
Date Acquired
August 13, 2013
Publication Date
July 1, 1986
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 17A
ISSN: 0360-2133
Subject Category
Metallic Materials
Accession Number
87A23846
Funding Number(s)
CONTRACT_GRANT: NAS8-32998
Distribution Limits
Public
Copyright
Other

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