ETREMA Products Terfenol-D Magnetostrictive Smart Material (Tb0.3Dy0.7Fe1.92)  (discontinued **)
Categories: Metal; Electronic/Magnetic Alloy
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:

  • 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 PropertiesMetricEnglishComments
Density 9.25 g/cc0.334 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Tensile Strength, Ultimate 28.0 MPa4060 psi
Modulus of Elasticity 25.0 - 35.0 GPa3630 - 5080 ksi
 18.0 - 55.0 GPa2610 - 7980 ksiat constant current
 50.0 - 90.0 GPa7250 - 13100 ksiat constant voltage
Compressive Strength 700 MPa102000 psi
Bulk Modulus 90.0 GPa13100 ksi
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.0000600 ohm-cm0.0000600 ohm-cm
Magnetic Permeability 4.5 - 104.5 - 10
Curie Temperature 357 °C675 °F
 
Thermal PropertiesMetricEnglishComments
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-°C0.0765 - 0.0884 BTU/lb-°F
Thermal Conductivity 10.5 - 10.8 W/m-K72.9 - 75.0 BTU-in/hr-ft²-°F
Melting Point 1240 °C2260 °F
 
Component Elements PropertiesMetricEnglishComments
Dysprosium, Dy 42.3 %42.3 %
Iron, Fe 40 %40 %
Terbium, Tb 17.7 %17.7 %
 
Descriptive Properties
Magnetomechanical Conversion Efficiency49 - 56%
Magnetomechanical Coupling Factor0.7 - 0.75
Magnetostrictive Energy Density0.014 - 0.025 J/cm³
Magnetostrictive Strain Production1500 - 2000 µm/m
Sound Speed1640 - 1940 m/s

**
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