(TbDy)Fe2 Giant Magnetostrictive alloy parts λ// (1kOe) 500～700 x10-6 λ//(0.5kOe,10Mpa) 800～1200 x10-6 d33 2.7～20.0 10-9m/A k33 0.7～0.9 Density (ρ g) 9.20～9.25 g / cm3 Acoustic Velocity (Cb) 1700～2700 m/s Curie Temperature (Tc) 380 °C Relative Permeability (μ r) 5～10 Resistivity (r e) 60 μΩ.cm Young's Modulus (E) 2.5-4.0 x1010 N/m2 Tensile Strength (σ bb) >= 25 MPa Compressive Strength (σ b) >= 400 MPa Shape: round rod, disc, rectangle bar, plate, odd; Customized design is welcomed Size: diameter (side length) from 3 to 50 mm, length (thickness) from 2 to 250 mm |
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Characteristics
Hi performance,
Good consistency
the performance fluctuation of the different
parts of the product or different products is lower than 10
percent.
High density and good quality
density>=9.2g/cm3
and compressive strength >=400MPa.
The material structure is
compact and uniform.
No flaws, holes and
block-falling. High strength, smooth and bright surface.
Complete specifications
Directional solidification crystals,
casting materials and powder metallurgy etc. products can be
manufactured.
Shape: round rod, disc, rectangle bar, plate, odd; Customized design is welcomed
Size: diameter (side length) from 3 to 50 mm, length (thickness) from 2 to 250 mm
Coating can be added for the products according to the
requirement of the users.
Customized design is welcomed
Performance curves (for a pervious sample only)
Applications
The magnetostrictie strains fo traditional materials are quite
low (λ//=10~100 x 10-6). Several RE giant magnetostrictive
alloys (GMM) were developed in 1960’s~1980’s, one of which is
(TbDy)Fe2 twinned single crystal with <112> preferred
orientation. Its strains is more than 1000 x 10-6 at 0.5kOe.
Compared with piezoceramics, (TbDy)Fe2 is 4 times greater and
its power density is 20 times higher.
Magnetic acoustic transducers: Underwater sonar is most
important application for GMM. GMM can also be applied to land
sonar, sonic transducers and ultrasonic transducers, speakers.
Actuators: applications in this aspect include linear motors,
inchworm motors, robots, fuel injection pumps, active inhibiting
vibration system and ink jet print heads.
Controllers: e.g. the fluid, can be controlled
directly; Servo valves can be controlled indirectly by
controlling the fluid; Other practical applications including
precision machining, switches and phase modulators etc.
Sensors: e.g. micro-displacement sensors, accelerations
sensors, audiphones and noise or vibration sensors etc.
Electronics elements: e.g. sound surface waves element, delay
lines, filters and etc.
*λ// is the axial strain, under 39.8-79.6kA/m
magnetic field at 5-10Mpa pre-stress, when the rod axis parallel
to the field.
