11 July 2001 Large magnetostriction in Terfenol-D particulate composites with preferred [112] orientation
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Terfenol-D particulate composites have been fabricated with and without a preferred crystal orientation of the particles. A 25% volume fraction polymer matrix composite was fabricated in a magnetic field using geometric anisotropy to orient needle shaped particles with long axis [112] orientation along the length of the composite. Results demonstrate that the magnetostriction of a [112] oriented particle composite saturates near 1600 ppm. This is a significant increase when compared to composites without preferential orientation (1200 ppm). The oriented particle composite exhibits the largest reported magnetostriction for a particulate composite material. The magnetization-strain measurements indicate that the strain in the oriented composite is proportional to the (lambda) 112 saturation magnetostriction while the non-oriented composite is proportional to the polycrystalline saturation magnetostriction, (lambda) pc. In addition, the fields necessary for equivalent magnetostriction in the oriented particle composite are reduced when compared to the non-oriented composite, though both require higher fields than commercially available monolithic Terfenol-D.
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Geoffrey P. McKnight, Geoffrey P. McKnight, Gregory Paul Carman, Gregory Paul Carman, "Large magnetostriction in Terfenol-D particulate composites with preferred [112] orientation", Proc. SPIE 4333, Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics, (11 July 2001); doi: 10.1117/12.432754; https://doi.org/10.1117/12.432754

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