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Magnetostriction of Polycrystalline Tb-Dy Alloys at Cryogenic Temperatures

Dooley, J. and Good, N. and Graetz, J. and Chave, R. and Fultz, B. (2000) Magnetostriction of Polycrystalline Tb-Dy Alloys at Cryogenic Temperatures. In: Advances in Cryogenic Engineering Materials. Vol.46A. Springer , Boston, MA, pp. 383-389. ISBN 978-1-4613-6926-4.

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Single crystals of Tb-Dy alloys exhibit magnetostrictive strains and forces sufficiently large to make them useful as actuators in cryogenic mechanical devices. These actuators offer many advantages over piezoelectric actuators and actuators using motion feedthroughs from higher temperature. We are developing textured polycrystalline materials as alternatives to single crystals, since polycrystals are much simpler to prepare and are less costly. Magnetostrictive strains of 56% of the single crystal value are reported for deformation-processed Tb-Dy. We show that substantial magnetostriction can be attained using low cost commercial grade (total purity 99.7%) Tb-Dy material (as opposed to expensive high purity (99.94%) material required for the growth of single crystals). The effect of grain size and texture on magnetostrictive performance is discussed.

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Fultz, B.0000-0002-6364-8782
Additional Information:© 2000 Kluwer Academic/Plenum Publishers, New York. The research described in this paper was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration and at the California Institute of Technology. This work was supported under the Advanced Technology Development program with funds provided by the Microgravity Division. The authors would like to thank Dr. Clark for many helpful discussions. The authors would also like to thank Mr. Finch for his efforts in metallography of the Tb-Dy specimens.
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Subject Keywords:Polycrystalline Material; Crystallographic Texture; Thermal Expansion Measurement; Magnetostrictive Strain; Magnetostrictive Actuator
Record Number:CaltechAUTHORS:20191009-094001287
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99182
Deposited By: Tony Diaz
Deposited On:09 Oct 2019 17:08
Last Modified:09 Oct 2019 17:08

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