Abstract
SmFe alloy was prepared by mechanical alloying of the elemental metals, and the Sm 2Fe 17 phase was obtained through properly crystallizing the SmFe alloy. Subsequently, the nitrogenation behaviour of the Sm 2Fe 17 phase was investigated. The results show that nitrogenation consists of the following processes: incubation period, coexistence of Sm 2Fe 17 and nitride phase, and transformation of the residual Sm 2Fe 17 into nitride phase. During nitrogenation, small amounts of very fine α-Fe particles segregate. After nitrogenation, the metastable phase formed during crystallization disappears; this is attributed to the nitrogen-induced transformation of the hexagonal Sm 2Fe 17 phase into the rhombohedral one.
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