Partitioning behavior and the effect of Co on the Curie temperature of nanocomposite PrFeCoB hard magnetic alloys

Zhang, Y.; Warren, P. J.; Cerezo, A.; Harland, C. L.; Davies, H. A.
August 2001
Applied Physics Letters;8/6/2001, Vol. 79 Issue 6
Academic Journal
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 α-Fe–Co and tetragonal Pr[sub 2](FeCo)[sub 14]B. Practically all of the B and Pr atoms are rejected from the α-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. © 2001 American Institute of Physics.


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