Abstract
Before melt-spinning of the alloys, the formation of a Sm2Fe17 phase with Th2Zn17 type structure in Sm2(Fe0.9Cr0.1)17C1.6 alloys is confirmed by studying the microstructure of ingots. Sm2(Fe0.9Cr0.1)17C1.6 melt-spun ribbon exhibits the coercive force of 672 kAm-1 (8.4 kOe) after annealing at 750°C for 30 min. Microstructural studies indicate that the ribbon consists of fine grains of 50–150 nm in diameter. It is found that a phase transformation from TbCu7 to Th2Zn17 is caused with increasing annealing temperature, by X-ray analysis and the variation of magnetic hysteresis loops. The Ga containing ribbon of Sm2(Fe0.9Ga0.1)17C1.6 exhibits the coercivity of 680 kAm-1 (8.5 kOe) after annealing. A further addition of M (M=Co, Mn) to Sm2(Fe, Cr17)C1.6 and Sm2(Fe, Ga17C1.6) alloys improves the magnetic properties. Especially, (Sm2Fe0.85Ga0.1Co0.05)17C1.6 ribbon annealed at 650°C for 30 min exhibits high coercivity of 1008 kAm-1 (12.6 kOe) with the (BH)max of 62.4 kJm-3 (7.8 MGOe). This is the highest magnetic properties among the reported values of Sm2Fe17Cx melt-spun ribbons so far.
Original language | English |
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Pages (from-to) | 146-150 |
Number of pages | 5 |
Journal | Materials Transactions, JIM |
Volume | 33 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1992 |
Keywords
- SmFeC compound
- additional elements
- coercivity
- melt-spun ribbon
- samarium-iron-carbon
ASJC Scopus subject areas
- Engineering(all)