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Title: Magnetomechanical damping in cryogenic TbDy
Authors: Dooley, J.
Good, N.
White, C.
Leland, S.
Fultz, B.
Issue Date: 28-Oct-2002
Citation: Transducing Materials and Devices
Brugge, Belgium
Abstract: Vibration damping in polycrystalline TbDy alloys was studied at cryogenic temperatures. The material was prepared by cold-rolling to induce crystallographic texture, and was then heat-treated to relieve internal stress. Mechanical hysteretic losses were measured at various strains, frequencies, and loading configurations at 77 K. Some textured TbDy materials demonstrated 22.6% energy dissipation in mechanical measurements at low frequency (0.01 Hz) and a mean logarithmic decrement of 0.23 at a higher frequency (25 kHz). Ultrasonic velocities of longitudinal and shear elastic waves were measured on single and polycrystalline TbDy; little variation in ultrasonic velocities was found evenfor samples with large variation in crystallographic texture and magnetomechanical properties.
Appears in Collections:JPL TRS 1992+

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