Abstract
The magnetostrictive properties of Alfenol, a cold-rolled Al-Fe alloy, were investigated to determine its suitability for use in electromechanical transducers. The effects of various processing techniques are included. The material, in the form of laminated toroids, was evaluated by the motional impedance method. Measured values of the electromechanical coupling coefficient, the mechanical Q in air, the reversible permeability, the dynamic magnetostrictive constant, and other parameters are given. The measurements indicate that the performance of 12- or 13-Alfenol is comparable to that of nickel, at least for low-power applications. The electromechanical coupling coefficient (approximately 0.29) is comparable to that of nickel; the electrical resistivity is at least ten times greater than that of nickel.
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