ETREMA Products Terfenol-D Magnetostrictive Smart Material (Tb 0.3 Dy 0.7 Fe 1.92 )

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ETREMA Products Terfenol-D Magnetostrictive Smart Material (Tb_0.3Dy_0.7Fe_1.92) (discontinued **)
Categories:	Metal; Electronic/Magnetic Alloy
Material Notes:	Terfenol-D is the commercial name for Tb_0.3Dy_0.7Fe_1.92; a composition of material that exhibits giant magnetostriction. Magnetostriction is the phenomenon in which an applied magnetic field causes an anisotropic change in length in the material (Joule effect) or a change in the stress state of the material changes its magnetic properties (Villari effect). Magnetostrictive alloys have a wide range of applications in the areas of ultrasonics, sensors, audio, and transducers such as: Actuators Seismic tools Non-round machining High-powered ultrasonics Sonar Fuel injection Vibration control Information provided by ETREMA Products.
Key Words:	T-D, Tb0.3Dy0.7Fe1.92, magnetostrictive, magnetoelastic
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Physical Properties	Original Value	Comments

Density	9.25 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	28.0 MPa
Modulus of Elasticity	25.0 - 35.0 GPa
	18.0 - 55.0 GPa	at constant current
	50.0 - 90.0 GPa	at constant voltage
Compressive Strength	700 MPa
Bulk Modulus	90.0 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000600 ohm-cm
Magnetic Permeability	4.5 - 10
Curie Temperature	357 °C

Thermal Properties	Original Value	Comments
CTE, linear	12.0 µm/m-°C @Temperature 20.0 °C
Specific Heat Capacity	0.320 - 0.370 J/g-°C
Thermal Conductivity	10.5 - 10.8 W/m-K
Melting Point	1240 °C

Component Elements Properties	Original Value	Comments
Dysprosium, Dy	42.3 %
Iron, Fe	40 %
Terbium, Tb	17.7 %

Descriptive Properties
Magnetomechanical Conversion Efficiency	49 - 56%
Magnetomechanical Coupling Factor	0.7 - 0.75
Magnetostrictive Energy Density	0.014 - 0.025 J/cm³
Magnetostrictive Strain Production	1500 - 2000 µm/m
Sound Speed	1640 - 1940 m/s

**
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NETREMA0 / 16184

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