Magnetoelastic vibration damping properties of TbDy alloys

Jennifer A. Dooley; Nathan R. Good; Christopher V. White; Robert S Leland

doi:10.1117/12.468377

11 March 2003 Magnetoelastic vibration damping properties of TbDy alloys

Jennifer A. Dooley, Nathan R. Good, Christopher V. White, Robert S Leland

Proceedings Volume 4946, Transducing Materials and Devices; (2003) https://doi.org/10.1117/12.468377
Event: Photonics Fabrication Europe, 2002, Bruges, Belgium

Abstract

Damping of axial and bending mode vibrations in giant magnetoelastic polycrystalline TbDy alloys was studied at cryogenic temperatures. All specimens of TbDy were arc-melted in the proper composition ratio and dropped into a chilled copper mold. Additional treatments consisted of cold plane-rolling to induce crystallographic texture and then heat-treating to relieve internal stress. Mechanical hysteretic losses were measured at various strains, frequencies, and loading configurations down to 77 K. Both as-cast and textured polycrystalline TbDy samples were tested along with an aluminum specimen for comparison. Loss factors at multiple natural vibration frequencies of the samples were measured for axial modes. Larger damping rates were measured for axial mode vibrations than for bending mode vibrations, possibly reflecting the larger specimen volume contributing to magnetoelastic damping. At LN₂ temperatures TbDy materials demonstrated η > 0.05 at 0.01 Hz and η > 0.1 at higher frequencies from 0.6-1.5 kHz.

Citation Download Citation

Jennifer A. Dooley, Nathan R. Good, Christopher V. White, and Robert S Leland "Magnetoelastic vibration damping properties of TbDy alloys", Proc. SPIE 4946, Transducing Materials and Devices, (11 March 2003); https://doi.org/10.1117/12.468377

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