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利用μ-衍射技术可对线直径小于5000A的显微区域作结构分析,而μμ衍射则可对线直径小于100A的超显微区域作分析。该实验技术日趋成熟,但实际应用尚不够广泛,这关系到制样技术问题。在超显微颗粒的结构分析上,为了排除基体的种种不利干扰,本文采用的非水电解恒电流萃取法,获得了微钛(0.017-0.024Wt％Ti)处理16Mn焊缝金属中100A左右的超细显微夹杂物。利用JEM-2000FX分析型电镜通过聚焦电子束μ-衍射确定了它们的相结构。用聚焦电子束μ-衍射获得了焊缝金属中晶带轴为[(5|-)12]钛的高价氧化物TiO_2及晶带轴为[(5|-)32]和
The μ-diffraction technique can be used to analyze the microscopic area with a diameter of less than 5000A, while the μμ diffraction method can analyze the ultra-microscopic area with a diameter of less than 100A. The experimental technology has matured, but the practical application is not yet broad enough, which is related to sample preparation technology. In the microstructure analysis of superfine particles, in order to eliminate all kinds of adverse interferences of matrix, the non-aqueous galvanostatic galvanostatic extraction method was used to obtain the microstructure of micro-titanium (0.017-0.024Wt% Ti) Superfine microscopic inclusions. Their phase structures were confirmed by focused electron beam μ-diffraction using a JEM-2000FX analytical electron microscope. The high-valent oxide TiO_2 with [(5 | -)] 12] titanium in the weld metal and the [(5 | -)]