Magnetostrictive underwater sound transducers

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Abstract
Certain alloys of terbium, dysprosium, holmium, and iron are currently receiving consideration for application in underwater sound transducers. The material properties of selected alloys and their importance in transducer engineering are presented. The design and operating characteristics of a transducer utilizing Tb0.27Dy0.73Fe2 are described and compared with results from the same transducer using piezoelectric ceramic. The design and evaluation of this transducer have clearly identified several needs for further development of the alloys, especially in the areas of grain orientation, lower cost, and quantity production, before they can be considered competitive with piezoelectric ceramics

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