论文部分内容阅读
利用透射电子显微镜对纯铁离子渗氮后扩散层中析出的Ｆｅ_１６Ｎ_２氮化物进行了研究.结果表明、纯铁离子渗氮后炉冷过程中，扩散层中析出的Ｆｅ_１６Ｎ_２呈非均质特征．析出形貌为长条薄片状、以α基体的｛１００｝α惯习面、长轴平行于＜０１１＞取向．实验中获得了Ｆｅ１６Ｎ２与α基体在［１００］；［１１１］，［１１０］，［０１１］，［１１３］，［３１１］，［１３３］，［３３１］．［０２１］［２１０］，［１３５］和［３５１］取向的两相电子衍射谱，二者之间的取向关系为：＜００１＞Ｆｅ_１６Ｎ_２／／＜００１＞α，｛１００｝Ｆｅ_１６Ｎ_２／／｛１００｝α。选区电子衍射表明，Ｆｅ_１６Ｎ_２的衍谢谱符合体心消光规律，未发现有符合面心消光规律的衍射谱存在．理论分析得出 Ｊａｃｋ－２（ｘ＝０２２２，ｚ＝０．３０６） 结构的 Ｆｅ_１６Ｎ_２与 Ｊａｃｋ－１（ｘ＝０．２５，ｚ＝０．３１２５）结构的 Ｆｅ_１６Ｎ_２的衍射谱均满足体心消光视津
Transmission electron microscopy (TEM) was used to study the precipitation of Fe_16N_2 nitride in the diffusion layer after pure iron ion nitriding.The results show that Fe_16N_2 precipitated in the diffusion layer is heterogeneous in the furnace cooling process after pure iron ion nitriding. The morphology of the precipitates was thin strip, with the {100} α habit plane of α matrix parallel to the <011> orientation. The Fe16N2 and α matrix were obtained in [100], [111], [110], [011], [113], [311], [133] and [331]. The orientation relationship between the two is: <001> Fe_16N_2 // <001> α, {100} Fe_16N_2 // {100 } Α. The selected area electron diffraction shows that the spectrum of Fe_16N_2 is in agreement with the body extinction law, and no diffraction spectrum satisfying the face-centered extinction rule is found. Theoretical analysis shows that the diffraction spectra of Fe_16N_2 with Jack-2 (x = 0222, z = 0.306) and Fe_16N_2 with Jack-1 (x = 0.25, z = 0.3125) Tianjin