Magnetostrictive Fe-Ga Wires with <100> Fiber Texture
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1129-V01-02
Magnetostrictive Fe-Ga Wires with Fiber Texture S.P. Farrella,*, P.E. Quigleya, K.J. Averya, T.D. Hatchardb,c, S.E. Flynnb, R.A. Dunlapb,c a
Defence R&D Canada - Atlantic, 9 Grove St., Dartmouth, NS, Canada B2Y 3Z7 Dept of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, Canada B3H 3J5 c Institute for Research in Materials, Dalhousie University, Halifax, NS, Canada B3H 3J5 * author for correspondence - email: [email protected]
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ABSTRACT Recently, low-cost processing approaches that produce textured thin bodies have engendered interest as cost-effective approaches for fabrication of magnetostrictive Fe-Ga alloys. In particular, wire-forming methods that strictly control the solidification direction could lead to some measure of crystallographic texture control. This is critical for development of large magnetostriction in polycrystals and for use of the alloys in actuators, sensors, energy harvesters and other systems. Magnetostrictive Fe-Ga wires have been prepared using an innovative costeffective approach – based on the Taylor wire method – that combines rapid solidification and deformation processes. The procedure for making magnetostrictive wires is discussed and the wires are evaluated in terms of microstructure, crystallographic texture and magnetostriction. Results show that the Taylor-based approach is an effective and versatile means to draw 1-3 mm diameter textured Fe-Ga wire. Experimentation on the influence of drawing technique and quench conditions on texture development resulted with production of a strong fiber texture in the Fe-Ga wire. Magnetostriction measurements, in the absence of prestress, indicated a maximum magnetostriction of ~165 ppm in a saturation field of less than 200 mTesla. This is considered a significant strain for bulk polycrystalline Fe-Ga alloys without a pre-stress or a stress-annealing treatment. The unique properties of wires made with the Taylor-based approach coupled with the low intrinsic cost make this an attractive approach for production of textured magnetostrictive wire for a variety of applications. INTRODUCTION There has been a proliferation of research into cost-effective non rare-earth element based magnetostrictive materials for actuators, sensors, motors, adaptive structures, energy harvesters and other applications. Although Fe-Ga alloys exhibit approximately 20 % of the strain of traditional giant magnetostrictive alloys (ex., Terfenol-D), they are less expensive, more robust and combine advantages of toughness, formability, machinability and mechanical strength with large magnetostriction (and little magnetic hysteresis) at low saturation fields [1]. While Fe-Ga single crystals offer better magnetoelastic properties over their polycrystalline counterparts, fabrication of single crystals is expensive. Recently, low-cost processing approaches that produce highly textured (near ) thin bodies of Fe-Ga alloys have engendered interest (for example, see the work of [2]). The strong texture is desired due to the anisotr
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