Large magnetostriction in Terfenol-D particulate composites with preferred [112] orientation

Geoffrey P. McKnight; Gregory Paul Carman

doi:10.1117/12.432754

Abstract

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.

Citation Download Citation

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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