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RESEARCH HIGHLIGHTS
DEVELOPMENT OF STRONG AND DUCTILE FeGa BASED MAGNETOSTRICTIVE ALLOYS *
- Large magnetostriction values obtained by the addition of Ga to Fe. Magnetostriction of Fe increased by nearly 10 times.* *
- This magnetostriction is achieved at fields that are very low and with very low hysteresis
Inverse pole figure showing [001] texture in rolled and annealed Fe-Ga alloys
* Supported by National Science Foundation, DMR Award # 0241603 (Disclaimer)
**Pending Patent application jointly by University of Utah and NSWC/US Navy
PROPERTY COMPARISIONS
| Terfenol-D (Dy0.7Tb0.3Fe2) |
FeGa Based Alloy |
 |
 |
| Laves Phase - C15
Tb and Dy : Green Spheres
Fe: Red Spheres
|
α Fe Phase - A2
Fe, Ga: Yellow spheres
|
| Room temperature Magnetostriction of around 1200 ppm |
Room Temperature Magnetostriction of 200 - 400 ppm |
| Lower Young's Modulus (25-30 MPa) |
Higher Young's Modulus (160-180 MPa) |
| Narrower Operating Temperature Range |
Wider Operating Temperature Range |
| High Coercivity (>35 Oe) |
Low Coercivity (<3) |
| Brittle |
Rugged & Deformable |
| Expensive |
Much Less Expensive |
TERFENOL-D COMPOSITE FABRICATION BY EXPLOSIVE COMPACTION
Terfenol-D powder mixed with copper or iron powder have been consolidated by explosive compaction to obtain composites with high fracture toughness.
PROCESSING OF MAGNETOSTRICTIVE THIN FILMS FOR MEMS APPLICATIONS
3-Dimensional pole figure showing [001] texture development by magnetic annealing of amorphous Terfenol-D films on Si Substrates
CURRENT RESEARCH FOCUS
- Development of new alloys based on Fe and relatively inexpensive alloying elements
- Low cost processing approaches for FeGa based alloys
- Processing of Magnetostrictive thin film structures based on FeGa and Terfenol-D
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