Terfenol-D, an alloy of the formula TbxDy1-xFe2 (x ~ 0.3) is a magnetostrictive material. It was initially developed in the 1970s by the Naval Ordnance Laboratory in North America. The technology for manufacturing the material efficiently was developed in the 1980s at Ames Laboratory under a U.S. Navy funded program. It is named after terbium, iron (Fe), Naval Ordnance Laboratory (NOL), and the D comes from dysprosium.
The alloy has the highest magnetostriction of any alloy, up to 0.002 m/m at saturation; it expands and contracts in a magnetic field. Its initial application was in naval sonar systems. It sees application in magnetomechanical sensors, actuators, and acoustic and ultrasonic transducers, e.g. in the SoundBug device (its first commercial application by FeONIC).
See also 
- Wheeler, Scott L. (2002-10-29). "PRC Espionage leads to `Terf' war: investigators say China placed students in American universities to gain secret information about an exotic material with valuable industrial and military uses | Insight on the News Newspaper | Find Articles at BNET". Findarticles.com. Retrieved 2010-04-08.
- Magnetostriction and Magnetostrictive Materials - Magnetostrictive Composites - Active Material Laboratory
- "Fuel Injector Patent". Retrieved 2011-02-18.
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