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Abstract

The addition of Al and Ga to b.c.c. Fe increases the magnetostriction of Fe in the [100] direction (a factor of 12 for Fe81Ga19). The Fe-based magnetostrictive materials are machineable, mechanically tough, and saturate in fields of only a few hundred Oersteds, even under compressive loads up to 97 MPa. The effect of annealing single crystal Fe86.9Ga4.1Al9.0 and Fe86.9Ga8.7Al4.4 and polycrystalline Fe81.6Ga18.4 rods under compressive stress of 100MPa for 10 min at temperatures between 625 and 750 C were examined. After annealing, all samples showed nearly full performance at near-zero stresses and tensile stresses up to 20 MPa, allowing tough wide-bandwidth magnetomechanical devices.

Keywords

magnetostriction Fe-Ga transduction stress annealing Galfenol

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References

Clark, A.E. , Wun-Fogle, M. , Restorff, J.B. and Lograsso, T.A. 2002. “Magnetostrictive Properties of Galfenol Alloys Under Compressive Stress” , Materials Transactions, 43(5): 881-886 .

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Restorff, J.B. , Wun-Fogle, M. , Clark, A.E. , Lograsso, T.A. , Ross, A.R. and Schlagel, D.L. 2002. “Magnetostriction of Ternary Fe-Ga-X alloys (X 1/4 Ni, Mo, Sn, Al)” , Journal of Applied Physics, 91(10): 8225-8227 .

Wun-Fogle, M. , Restorff, J.B. , Leung, K. and Clark, A.E. 1999. “Magnetostriction of Terfenol-D Heat Treated Under Compressive Stress” , IEEE Transactions on Magnetics, 35(5): 3817-3819 .

Magnetostriction of Stress-annealed Fe-Ga and Fe-Ga-Al Alloys under Compressive and Tensile Stress

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