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Effect of small Zr additions on the microstructure of Sm2Fe17

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7 Author(s)
M. Kubis ; Sch. of Metall. & Mater., Birmingham Univ., UK ; D. N. Brown ; O. Gutfleisch ; B. Gebel
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Microstructure and phase composition of Sm10.5+δFe89.5-δ-∞Zr samples with δ=0, 1.5 and x=0, 1, 2 were investigated. The Zr addition reduces the amount of Sm-rich phase and free α-Fe in as-cast materials, whereas the Sm addition (only investigated for Zr-containing alloys) reduces the amount of free α-Fe on cost of a higher amount of Sm-rich phase. The Zr is not uniformly distributed in the as-cast materials, forming Zr-rich (Sm, Zr)Pes phase (10-20 at% Zr) besides 1:3 and 2:17 phases with lower Zr content (⩽1 at% Zr). However, after homogenization, these Zr- rich regions disappeared and the Zr was then uniformly distributed in the 1:3 phase regions. The hard magnetic properties of all samples were studied after milling and nitrogenation. The highest energy product (BH)max of 146 kJm -3 was obtained for the homogenized Zr-free sample. However, the properties of the as-cast materials are improved by the Zr-addition, with the optimum composition of Sm12FeZr1Ny showing a (BH)max of 125 kJm-3

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IEEE Transactions on Magnetics  (Volume:36 ,  Issue: 5 )