Improved Magnetostrictive Transducer Drive Elements Achieved by Reduction of Crystalline Defects and Improved Crystalline Orientation
ETREMA PRODUCTS INC AMES IA
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The discovery of the giant magnetostrictive rare earth-iron alloys in the 1970s was a direct result of the efforts initiated at DODs Naval Surface Warfare Center NSWC, Silver Spring, MD in conjunction with DOEs Ames Laboratory AL, Ames, IA. This research into these new materials was specifically targeted for the development of low frequency, high power transducers for underwater sonar systems. The most technologically advanced of these materials in TERFENOL-D, Tb3Dy7Fe1.9-1.95 an intermetallic compound consisting of iron Fe and the rare earth metals terbium Tb and dysprosium Dy. Because of the advantages over existing transducer materials see Table 1 , the use of TERFENOL-D as a transducer drive element is expanding into a broad range of commercial applications and advanced defense systems. One of the disadvantages is the cost of these drivers, primarily the terbium and dysprosium raw materials.
- Inorganic Chemistry
- Electrical and Electronic Equipment
- Metallurgy and Metallography
- Electricity and Magnetism