Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1805158 | Journal of Magnetism and Magnetic Materials | 2006 | 4 Pages |
Abstract
In order to clarify the origin of the high thermal stability of the microstructure in bcc-Fe/amorphous two-phase nanocrystalline soft magnetic materials, we have investigated the changes in the magnetic and microstructural properties upon isothermal annealing at 898Â K for an Fe89Zr7B3Cu1 alloy by means of transmission electron microscopy, Mössbauer spectroscopy and DC magnetometry. The mean grain size was found to remain almost unchanged at the early stage of annealing. However, rapid grain coarsening was evident at an annealing time of 7.2Â ks where the intergranular amorphous phase begins to crystallize into Fe23Zr6. The grain growth process with a kinetic exponent of 1.6 is observed for the growth process beyond this annealing time, reflecting the disappearance of the intergranular amorphous phase. Our results confirm that the thermal stability of the bcc-Fe/amorphous two-phase nanocrystalline soft magnetic alloys is governed by the residual amorphous phase.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Jasmine Chia-hsin Shih, Laure Bourgeois, Kiyonori Suzuki, Jose S. Garitaonandia,