Partitioning behavior and the effect of Co on the Curie temperature of nanocomposite PrFeCoB hard magnetic alloys
The microstructure and phase chemistry of melt-spun nanocomposite Pr{sub 9.7}Fe{sub 76.6}Co{sub 7.8}B{sub 5.9} and Pr{sub 9.2}Fe{sub 69.4}Co{sub 15.4}B{sub 6.0} ribbons have been studied using three-dimensional atom probe (3DAP) and transmission electron microscopy. The microstructure of these alloys consists of two phases, bcc {alpha}-Fe--Co and tetragonal Pr{sub 2}(FeCo){sub 14}B. Practically all of the B and Pr atoms are rejected from the {alpha}-Fe--Co phase and are concentrated into the 2/14/1 hard magnetic phase. However, no significant difference of Co concentration between the two phases is observed. From the measured Co concentration in the 2/14/1 phase, it is explained why the effect of Co content on Curie temperature (T{sub c}) is greater in the nanocomposite alloys than in single phase alloys. Predictions of T{sub c} for the nanocomposite alloys based on the 3DAP composition data show excellent agreement with experimental measurements. {copyright} 2001 American Institute of Physics.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40230708
- Journal Information:
- Applied Physics Letters, Vol. 79, Issue 6; Other Information: DOI: 10.1063/1.1388879; Othernumber: APPLAB000079000006000797000001; 026130APL; PBD: 6 Aug 2001; ISSN 0003-6951
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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