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Magnetostrictive Properties of Galfenol Alloys Under Compressive Stress
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Arthur E. Clark1), Marilyn Wun-Fogle2), James B. Restorff2) and Thomas A. Lograsso3)
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1) Clark Associates
2) Naval Surface Warfare Center, Carderock Division, Code 645
3) Ames Laboratory
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Fe–Ga alloys, in which the α-Fe structure is maintained, are rich sources of high strength, low cost magnetostrictive alloys for transducer and vibration reduction applications. Although the magnetostriction of Fe itself is very low, when a relatively small fraction of the Fe atoms are replaced by Ga, the magnetostriction, (3/2)λ100, increases greatly. Until recently, the highest magnetostriction was found with the replacement of Fe by Al (Alfenol). In this paper, we present our measurements of magnetostriction on Fe1−xGax, 0.13≤x≤0.24, (Galfenol). With the substitution of 19% Ga for Fe in Fe1−xGax, a 12-fold increase in magnetostriction to ∼ 400 ppm occurs, even though Ga is non-magnetic. In these alloys, the saturation magnetizations remain high, Ms≅1.7 T, and the Curie temperatures are far above room temperature, TC≅700°C. In most alloys studied, the magnetostrictions and magnetizations are fully saturated in fields less than 24 kA/m, even under compressive stresses >100 MPa. For x=0.24 (near Fe3Ga), an anomalous increase in magnetostriction with temperature occurs with a peak magnetostriction above room temperature. Small additions of Ni and Mo to the binary Fe–Ga alloys decrease the room temperature value of λ100.
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Keyword: magnetostriction, Galfenol, iron-gallium alloys
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Received: September 20, 2001
Accepted: December 06, 2001 ,
Published online: September 06, 2005 |
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Copyright (c) 2005 The Japan Institute of Metals |
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