| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
| Presentation Title |
Structural and Magnetic Properties of Fe-Ga-Zr Nanocrystalline Alloys |
| Author(s) |
Mohammad Tauhidul Islam, Ria Nandwana, Jonathan Healy, Jenna K. Jaklich, Bowen Dong, Matthew A. Willard, Alexander Yu, Yumi Ijiri, Emily E. Moore, Scott K. McCall |
| On-Site Speaker (Planned) |
Mohammad Tauhidul Islam |
| Abstract Scope |
Galfenol alloy (Fe1-xGax, x=0.1-0.3) has been widely studied in single crystal form because of its considerable magnetostriction, which is desirable in various sensor applications. However, single crystals are expensive and time consuming to prepare and their substantial coercivity (293 A/m for Fe83Ga17) requires significant magnetic fields to access the full magnetostriction in sensor applications. For these reasons, nanocrystalline Fe-Ga alloys have been considered to enhance magnetic softness and reduce manufacturing cost. We investigated eleven (Fe1-xGax)92Zr8 alloys with varying Ga concentration (x) between 0.15-0.36, which were prepared by rapid solidification. Subsequent annealing resulted in nanocrystalline BCC grains. The saturation magnetization value decreases from 124 Am2/kg to 51 Am2/kg as the Ga content increase from x=0.15 to x=0.36. The alloy with x=0.26 annealed at 550°C for 1 hour shows a peak magnetostriction of 10 ppm with saturation magnetization of 108 Am2/kg and coercivity of 260 A/m. (Supported by LLNL under Contract DE-AC52-07NA2) |