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Title: Large magnetostriction in epoxy-bonded Terfenol-D continuous-fiber composite with [112] crystallographic orientation
Authors: Lo, Ching-yin
Or, Derek Siu-wing
Chan, Helen L. W.
Subjects: [112] crystallographic orientation
Domain-wall motion
Fiber composites
Particulate composites
Issue Date: Oct-2006
Publisher: IEEE
Source: IEEE transactions on magnetics, Oct. 2006, v. 42, no. 10, p. 3111-3113.
Abstract: A Terfenol-D continuous-fiber composite with a preferred [112] crystallographic orientation was fabricated by embedding 50-vol% [112]-oriented Terfenol-D continuous fibers of 45 mm long and 1 mm wide in an epoxy matrix, and its magnetic and magnetostrictive properties were evaluated as a function of magnetic field. A [112]-oriented short-fiber composite with reduced Terfenol-D fiber lengths of 4 mm and a randomly oriented particulate composite with irregularly shaped Terfenol-D particles of 10-300 µm size, both with 50-vol% Terfenol-D, were also prepared and characterized for comparison with the continuous-fiber composite and monolithic Terfenol-D. The continuous-fiber composite demonstrated the largest magnetostrictive response with the highest saturation magnetostriction (λ[sub S]) of 1265 ppm. This λ[sub S] not only is 23% and 92% larger than the short-fiber and particulate composites, respectively, but also exceeds the monolithic Terfenol-D by 14%. The higher λ[sub S] compared to the monolithic Terfenol-D, short-fiber composite, and particulate composite mainly originates from the residual compressive stresses developed in the continuous fibers during epoxy cure, a higher fiber aspect ratio for greater stress transfer from the fibers to the matrix, and texturing of the fibers along the highly magnetostrictive [112] crystallographic axis, respectively.
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Type: Journal/Magazine Article
DOI: 10.1109/TMAG.2006.878873
ISSN: 0018-9464
Appears in Collections:AP Journal/Magazine Articles

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