Magnetic Properties of Cast (Pr,Dy)-(Fe,Co)-(B,C) Alloys

These experiments were carried out to investigate the effects of the composition and annealing conditions on the magnetic properties of isotropic cast (Pr, Dy)-(Fe, Co)-(B, C) alloys. Compositions were Pr
15
Fe
77
B
8
, Pr
15
(Fe
0.9
Co
0.1
)
77
(B
1-x
C
x
)
8
, and (Pr
0.9
Dy
0.05
)
15
(Fe
0.9
-Co
0.1
)
77
(B
0.5
C
0.5
)
8
, In Pr
15
(Fe
0.9
Co
0.1
)
77
(B
1-x
C
x
)
8
alloys, the value of H
CJ
increased with increasing carbon substitution in the range x=0 to 0.5. Of these cast alloys, (Pr
0.95
Dy
0.05
)
15
(Fe
0.9
Co
0.1
)
77
(B
0.5
Co
0.5
)
8
alloy annealed for 5 hours at 800°C exhibited the best magnetic properties, with (BH)
max
=38.4 kJ/m
³
, H
CJ
=392 kA/m, H
CB
=248 kA/m and B
r
=0.54 T. EDX analysis revealed that this alloys consists of two phases: a (Pr,Dy)-rich phase, and a (Pr,Dy)
2
(Fe,Co)
14
(B,C) phase.