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SPAR VI Technical Report for Experiment 76-22 : Directional Solidification of Magnetic Composites

Author
Larson, D. J., Jr.
Published
Jul 1, 1980.
Physical Description
1 electronic document
Additional Creators
Pirich, R. G.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
Samples of eutectic Bi/MnBi were directionally solidified during a low-g interval aboard the SPAR 6 flight and in a l-g environment under identical furnace velocity and thermal conditions. The Bi/MnBi eutectic is characterized by a regular rod eutectic whose morphology may be sensitive to thermo-solutal convection and by its components, MnBi, which is ferromagnetic. Morphological analyses on samples show statistically smaller interrod spacings and rod diameters with respect to samples grown under identical solidification furnace conditions in l-g. An adjustment between the interrod spacing, growth velocity, and total undercooling at the solidification interface is proposed. Morphological analyses on samples grown in l-g indicate little difference between results for different growth orientations with respect to the gravity vector. The magnetic properties are significantly affected, however, by the presence of a nonequilibrium magnetic phase and the nonequilibrium phase transforms to the equilibrium ferromagnetic phase during isothermal heat treatment.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19810010704.
Accession ID: 81N19231.
NASA-CR-161671.
RE-602.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15719901