Dynamic magnetomechanical properties of [112]-oriented Terfenol-D/epoxy 1-3 magnetostrictive particulate composites

The dynamic magnetomechanical properties of a Terfenol-D/epoxy 1-3 magnetostrictive particulate composite fabricated using 49% volume fraction of needle-shaped, [112]-oriented Terfenol-D particles were investigated as a function of magnetic bias field (H-Bias). A nonoriented composite with 51% volume fraction of irregular-shaped, ball-milled Terfenol-D particles was also prepared and characterized for comparison. It was found that the composites exhibit a similar qualitative trend in dynamic strain coefficient (d(33)) and dynamic susceptibility (chi(33)) with the oriented type possessing much higher values than the nonoriented type for all H-Bias. Data for the ratio d(33)/chi(33) indicated that these increments in d(33) and chi(33) in the oriented composite are mainly attributed to [112] particulate crystallographic orientation. (C) 2003 American Institute of Physics.