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The structure and magnetic properties of S_m.Fe_l00-1.5_y C_0.5_y(y=8-20) alloys prepared by mechanical alloying (MA) from Sm, Fe and graphite have been investigated systematically. In order to improve hard magnetic properties of the alloys prepared by mechanical alloying, a new method consisting of re-milling and re-annealing was developed. After being re-milled and re-annealed, the Curie temperature T_C of the Sm-Fe-C alloys changes. The T_C of 2:17 phase increases, whereas the T_C of 2.14.1 phase decreases. After being re-annealed at low temperatures, the grain sizes of hard phases are smaller than those in the alloys annealed at high temperatures. The effects of Co or Ti substitution for Fe are studied.
The structure and magnetic properties of S_m.Fe_l00-1.5_y C_0.5_y (y = 8-20) alloys prepared by alloying alloying (MA) from Sm, Fe and graphite have been investigated systematically. In order to improve hard magnetic properties of the After prepared re-milled and re-annealed, the Curie temperature T_C of the Sm-Fe-C alloys changes. The T_C of 2: 17 phase increases, whereas the T_C of 2.14.1 phase decreases. After effects re-annealed at low temperatures, the grain sizes of hard phases are smaller than those in the alloys annealed at high temperatures. are studied.