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ETREMA Products Terfenol-D Magnetostrictive Smart Material (Tb0.3Dy0.7Fe1.92)

Category Metal , Electronic/Magnetic Alloy
Manufacturer ETREMA Products
Trade Name Terfenol-D
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF ETREMA Products Terfenol-D Magnetostrictive Smart Material (Tb0.3Dy0.7Fe1.92).pdf
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Material Notes:
Terfenol-D is the commercial name for Tb0.3Dy0.7Fe1.92; 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:ActuatorsSeismic toolsNon-round machiningHigh-powered ultrasonicsSonar Fuel injectionVibration controlInformation provided by ETREMA Products.
Physical Properties Metric English Comments
Density 9.25 g/cc
0.334 lb/in³
Mechanical Properties Metric English Comments
Tensile Strength, Ultimate 28.0 MPa
4060 psi
Modulus of Elasticity 25.0 - 35.0 GPa
3630 - 5080 ksi
18.0 - 55.0 GPa
2610 - 7980 ksi
at constant current
50.0 - 90.0 GPa
7250 - 13100 ksi
at constant voltage
Compressive Strength 700 MPa
102000 psi
Bulk Modulus 90.0 GPa
13100 ksi
Thermal Properties Metric English Comments
CTE, linear 12.0 µm/m-°C

@Temperature 20.0 °C
6.67 µin/in-°F

@Temperature 68.0 °F
Specific Heat Capacity 0.320 - 0.370 J/g-°C
0.0765 - 0.0884 BTU/lb-°F
Thermal Conductivity 10.5 - 10.8 W/m-K
72.9 - 75.0 BTU-in/hr-ft²-°F
Melting Point 1240 °C
2260 °F
Component Elements Properties Metric English Comments
Dysprosium, Dy 42.3 %
42.3 %
Iron, Fe 40 %
40 %
Terbium, Tb 17.7 %
17.7 %
Electrical Properties Metric English Comments
Electrical Resistivity 0.0000600 ohm-cm
0.0000600 ohm-cm
Magnetic Permeability 4.5 - 10
4.5 - 10
Curie Temperature 357 °C
675 °F
Descriptive Properties Value Comments
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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