Abstract
The magnetostrictive properties of Alfenol, a cold-rolled Fe-Al alloy, for use as the active element in electromechanical transducers were compared with those of nickel. The aluminum content of the Alfenol was varied from ten to sixteen percent. After a suitable heat treatment a maximum effective electromechanical coupling coefficient of 0.31 was obtained with 12-Alfenol biased to four oersteds. The maximum effective coupling coefficient of 13-Alfenol was observed to be approximately the same as that of nickel, 0.27. While the effective coupling coefficient of 13-Alfenol is smaller than that of 12-Alfenol, the product of the characteristic frequency times the thickness squared for 13-Alfenol biased to twelve oersteds was twice that of 12-Alfenol biased to four oersteds and four times that of nickel biased to thirteen oersteds. Performance is given for similarly constructed Alfenol and nickel transducers.
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