Terfenol-D
Terfenol-D is an alloy of terbium , iron and dysprosium with the formula Tb x Dy 1-x Fe 2 (x ~ 0.3). The alloy was developed around 1970 at the Naval Ordnance Laboratory , a research facility of the United States Navy . The term Terfenol-D is an acronym and stands for TER bium, FE rrum, N aval O rdnance L aboratory and D ysprosium.
Terfenol-D is a highly magnetostrictive material and undergoes an elastic stretching parallel to the field in a magnetic field. The alloy has the highest magnetostriction of all known materials at room temperature. It is a maximum of 2 mm per meter (2 ‰).
It was originally developed for the manufacture of sonar devices . It is used in sensors , actuators and transducers .
literature
- Göran Engdahl: Handbook of Giant Magnetostrictive Materials . Academic Press, 1999.