High-coercivity (NdDy){sub 2}(FeNb){sub 14}B{endash}{alpha}{endash}Fe nanocrystalline alloys
- Department of Materials Science and Engineering, State key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, People`s Republic of (China)
- Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)
High coercivity, high remanence, and high energy product (NdDy){sub 2}(FeNb){sub 14}B{endash}{alpha}{endash}Fe nanocrystalline alloys containing 0 to 30 wt{percent} {alpha}{endash}Fe have been prepared by melt spinning and subsequent annealing. The best magnetic properties of remanence (B{sub r}), coercivity (H{sub ci}), and maximum energy product [(BH){sub max}] are 1.02 T, 702 kA/m, and 134 kJ/m{sup 3}, respectively, for Nd{sub 8.16}Dy{sub 1}Fe{sub 85.26}Nb{sub 1}B{sub 4.58}. The microstructure consists of a two phase nanocomposite of hard magnetic (NdDy){sub 2}(FeNb){sub 14}B and soft magnetic {alpha}{endash}Fe with an average size of about 30 nm. These small dimensions allow effective exchange coupling between hard and soft magnetic grains and result in the simultaneous enhancement of B{sub r}, H{sub ci}, and (BH){sub max}. A systematic study on the effect of annealing temperature and time on the microstructure and magnetic properties has been carried out. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 496551
- Report Number(s):
- CONF-961141-; ISSN 0021-8979; TRN: 97:016243
- Journal Information:
- Journal of Applied Physics, Vol. 81, Issue 8; Conference: 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Nanocrystalline Fe-Pt-B base hard magnets with high coercive force obtained from amorphous precursor
The effects of particle size and distribution on the magnetic properties of coercive Sm(Co,Fe,Cu,Zr){ital {sub z}} alloy powders for bonded magnet applications