The mechanism of magnetic properties improvement and microstructure refinement of Zr in Nd[subscript 2]Fe[subscript 14]B
- Ames
In order to understand the role of Zr addition in Nd{sub 2}Fe{sub 14}B (2-14-1), a systematic study of Zr in Nd{sub 2}Fe{sub 14}B was done on a series of stoichiometric samples (Nd{sub 1-x}Zr{sub x}){sub 2}Fe{sub 14}B with 0 {le} x {le} 0.16. As-cast ingots formed significant amounts of Nd{sub 2}Fe{sub 17} starting at x = 0.06, while in the melt-spun ribbons, no Nd{sub 2}Fe{sub 17} was observed for the range studied. A monotonic decrease in lattice parameters for the 2-14-1 phase indicate Zr solubility in the melt-spun ribbons, but this is not observed in the ingots. Magnetic and thermal measurements on the ribbons showed that the saturated magnetization Ms (around 16 kG), the spin reorientation temperature (125 K), and the Curie temperature (583 K) do not depend on the Zr content, while the anisotropy field Ha slightly decreased as the Zr content increased. The energy product (BHmax) and the coercive force H{sub c} are highly dependent on the solidification and annealing process. Scanning electron microscopy and transmission electron microscopy on the as-melt spun alloys are consistent with x-ray diffraction showing Zr solubility in the 2-14-1 grains. After annealing, Zr diffuses to the grain boundaries to form Zr enriched compounds. Thus, while Zr may exhibit a metastable solubility in Nd{sub 2}Fe{sub 14}B, the enhanced magnetic behaviors observed in melt-spun ribbons are due to the refinement of the microstructure and enhanced grain-boundary pinning.
- Research Organization:
- Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1007787
- Journal Information:
- J. Appl. Phys., Journal Name: J. Appl. Phys. Journal Issue: (8) ; 2006 Vol. 99; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- ENGLISH
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Related Subjects
GENERAL PHYSICS
ALLOYS
ANISOTROPY
ANNEALING
COERCIVE FORCE
CURIE POINT
GRAIN BOUNDARIES
LATTICE PARAMETERS
MAGNETIC PROPERTIES
MAGNETIZATION
MICROSTRUCTURE
SCANNING ELECTRON MICROSCOPY
SOLIDIFICATION
SOLUBILITY
SPIN
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION