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- W1973221485 abstract "Fe-rich exchange coupled nanocomposite R8(Fe,Co,Nb)86B6 (R=Nd, Pr) (consisting of hard 2:14:1 and soft α-Fe(Co) phases) and Sm2(Fe,Co)15Cr2C2 magnets (consisting of hard 2:17 and soft α-Fe(Co) grains) have been studied. In both systems the nanocomposite hard/soft microstructure is obtained by crystallizing the as-made amorphous melt-spun ribbons. The coercivity is found to depend mainly on the grain size of the soft phase which is very sensitive to the sample composition and annealing conditions. In the R–(Fe,Co,Nb)–B system, it is found that substitution of Nb for Fe significantly decreases the grain size of the α-Fe(Co) and increases the coercivity of the magnets. Substitution of Co for Fe increases the grain size and results in a dramatic decrease of coercivity. Increasing the B content of Co-substituted samples leads to a partial recovery of the coercivity. Magnetic properties Mr/Ms=0.7 and Hc=6.5 kOe have been obtained for Pr8((Fe0.5Co0.5)0.94Nb0.06)82B10. In the Sm2(Fe,Co)15Cr2C2 system, it is found that a higher annealing temperature combined with a shorter annealing time leads to a higher coercivity. The optimum annealing condition is at 900°C for 1 min where the highest coercivity of 12.1 kOe is obtained. The grain size of α-Fe in annealed ribbons becomes much smaller with Co substitution, leading to a stronger exchange coupling between the 2:17 and α-Fe phase. A significant enhancement in the Curie temperature of the 2:17 phase is observed in these magnets as compared to their parent alloys due to the exchange coupling effect between the 2:17 phase and the Fe(Co) phase." @default.
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- W1973221485 date "1999-06-01" @default.
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- W1973221485 title "Exchange coupled R2(Fe,Co,Nb)14B/(Fe,Co) (R=Nd,Pr) and Sm2(Fe,Co,Cr)17C2/(Fe,Co) nanocomposite magnets" @default.
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- W1973221485 doi "https://doi.org/10.1016/s0925-8388(99)00038-9" @default.
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