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Magnetomechanical effects in textured polycrystalline Tb76Dy24

Graetz, J. and Good, N. and Fultz, B. and Dooley, J. and Chave, R. (2000) Magnetomechanical effects in textured polycrystalline Tb76Dy24. Journal of Applied Physics, 87 (9). pp. 5795-5798. ISSN 0021-8979. doi:10.1063/1.372525.

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Uniaxial stress-strain measurements were performed on polycrystalline Tb76Dy24 alloys which exhibit "giant magnetostriction" at cryogenic temperatures. The Young's moduli were reduced by up to a factor of five at 77 K, in comparison to their values at 300 K. We attribute this reduction to a mechanical compliance from domain rotation. Large mechanical hysteresis is also found in nominally elastic stress-strain curves measured below the Curie temperature. Hysteretic curves from 0 to 25 MPa demonstrate up to 19% dissipation of the applied mechanical energy. The anisotropy of thermal expansion was also measured and used as a parameter for the degree of crystallographic texture. This anisotropy was correlated to bulk magnetostriction and to mechanical hysteresis.

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Fultz, B.0000-0002-6364-8782
Additional Information:© 2000 American Institute of Physics. Issue Date: May 1, 2000. The authors thank Dr. A.E. Clark for his suggestions for these measurements. The authors acknowledge support from the NASA Advanced Technology Development program with funds from the Microgravity Division. The Jet Propulsion Laboratory is operated by the California Institute of Technology under a contract with the National Aeronautics and Space Administration.
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Subject Keywords:magnetostriction, texture, terbium alloys, dysprosium alloys, thermal expansion, stress-strain relations, Young's modulus, magnetic domains, elastic hysteresis, ferromagnetic materials
Issue or Number:9
Record Number:CaltechAUTHORS:GRAjap00
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9545
Deposited By: Archive Administrator
Deposited On:01 Feb 2008
Last Modified:08 Nov 2021 21:00

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