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- W2079859164 abstract "Abstract The rapid solidification process in conjunction with nitrogenation has been employed to produce Sm 2 Fe 17 -nitride-based permanent magnets. In the as-quenched state, depending upon the alloy composition and process parameters, a mixture of the following phases was found: α-Fe, metastable SmFe 7 , Sm 2 Fe 17 , SmFe 3 , SmFe 2 , Sm and an amorphous phase. In general, Sm-rich alloys solidified at high quenching rates (55 m s −1 ) consist of a mixture of metastable SmFe 7 (TbCu 7 type) and an amorphous matrix. Subsequent heat treatment at 650 °C for 10 min forms Sm 2 Fe 17 (Th 2 Zn 17 type) in metastable equilibrium with SmFe 2 (MgCu 2 type). SmFe 3 (PuNi 3 type) also begins to precipitate and its amount increases for longer heat treatment times. The same mixture of phases (Sm 2 Fe 17 + SmFe 2 + SmFe 3 ) could also be produced directly in the as-quenched state at lower quenching rates (25 m s −1 ). Nitrogenation of the Sm 2 Fe 17 -based rapidly quenched alloys at about 450 °C forms Sm 2 Fe 17 nitride exhibiting coercivities as high as 17.7 kOe with a ( BH ) max of 12 MG Oe and a Curie temperature of 470 °C. The secondary phases present in the alloys (SmFe 2 + SmFe 3 ) decompose entirely into SmN + α-Fe." @default.
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- W2079859164 date "1993-05-01" @default.
- W2079859164 modified "2023-09-26" @default.
- W2079859164 title "Sm2Fe17-nitride-based permanent magnets produced by rapid solidification" @default.
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- W2079859164 doi "https://doi.org/10.1016/0925-8388(93)90588-e" @default.
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