Sm-Fe-N合金中显微组织随N含量的变化

IEEE Translation Journal on Magnetics in Japan Pub Date : 1994-11-01 DOI:10.1109/TJMJ.1994.4565983

K. Saito;H. Nakamura;S. Sugimoto;M. Okada;M. Homma

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引用次数: 6

摘要

用透射电子显微镜（TEM）观察了Sm2Fe17Nx（0≪x \8810；6）粉末的微观结构。在N2气体中氮化的Sm2Fe17N23粉末由于晶格膨胀而具有高位错密度。在NH3和H2气体的混合物中氮化的Sm2Fe17Nx粉末具有细胞状结构。位错密度随着N含量的增加而增加，晶胞直径减小，Sm2Fe17N5.9粉末由直径为30至50nm的Sm2Fe117Nx微晶晶粒组成，该微晶晶粒被非晶相包围。在600°C以上氮化的Sm2Fe17粉末离解成特征尺寸为10-20nm的SmN和α-Fe相。

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Microstructural Changes with N Content in Sm-Fe-N Alloys

The microstructures of Sm ₂ Fe ₁₇ N _x (0≪x≪6) powders were observed by transmission electron microscopy (TEM). Sm ₂ Fe ₁₇ N ₂₃ powders nitrided in N ₂ gas have high dislocation densities due to lattice expansion. Sm ₂ Fe ₁₇ N _x powders nitrided in a mixture of NH ₃ and H ₂ gases (3≪x≪6) have cell-like structures. The dislocation density increases and the cell diameter decreases with increasing N content, and Sm ₂ Fe ₁₇ N _5.9 powders consist of 30 to 50 nm in diameter Sm ₂ Fe ₁₇ N _x microcrystalline grains surrounded by an amorphous phase. Sm ₂ Fe ₁₇ powders nitrided above 600°C dissociate into SmN and α-Fe phases with characteristic sizes of 10 to 20 nm.

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