Abstract
Elemental powders of iron and samarium were mechanically alloyed in the concentration range of SmxFe100−x (x=11, 13, 15, 17). A two-phase mixture of amorphous Sm−Fe and α-Fe phases was formed in all compositions studied. The effect of the starting composition on the formation of Sm2Fe17 intermetallic compound was investigated by annealing mechanically alloyed powders. When the Sm content was 15 at.%, the annealed powders consisted of nearly a Sm2Fe17 single phase. For the preparation of a hard magnetic Sm2Fe17Nx compound, additional nitriding treatment was performed under an N2 gas flow at 450°C for various time intervals. It was found that nitrogenation for 3 hours was just enough to allow the formation of the Sm2Fe17Nx compound. The coercivity increased when the nitrogenation time increased up to 3 hours and then tended to decrease with further nitrogenation.
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