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Three-Dimensional Imaging of Dislocations in a Ti–35mass%Nb Alloy by Electron Tomography

机译：电子断层摄影术中Ti-35mass％NB合金中的脱位三维成像

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We have studied three-dimensional (3D) configurations of dislocations in the β phase of a Ti–35mass%Nb alloy by means of single-axis tilt tomography using bright-field scanning transmission electron microscopy (BF-STEM). To visualize dislocations, the hh0 systematic reflections were excited throughout tilt-series acquisition with the maximum tilt angle of 70°. Dislocations in the β grains were clearly reconstructed by the weighted back-projection algorithm. The slip planes of the dislocations were deduced by rotating the reconstructed volumes with the aid of selected area electron diffraction patterns. It was found that BF-STEM images with relatively low contrasts, taken along low-order zone axes, are capable to reproduce and preserve the quality of reconstructed image of dislocations. We also found that tilt angles as low as 40° are practically acceptable to visualize 3D configurations of dislocations, while there exists limitation in resolution due to the existence of a large missing wedge.
机译：我们通过使用亮场扫描透射电子显微镜（BF-Stem），通过单轴倾斜断层扫描研究了三维（3D）脱位在Ti-35MAS％NB合金的β相中的脱位。为了可视化错位，在整个倾斜串联采集中激发HHO系统反射，最大倾斜角为70°。通过加权回投影算法清楚地重建β晶粒中的脱位。通过借助于所选择的区域电子衍射图案旋转重建的体积来推导出脱位的滑移平面。结果发现，沿着低阶区域轴截取的具有相对低对比度的BF-STEM图像能够再现并保留位错的重建图像的质量。我们还发现，低至40°的倾斜角度实际上是可视化位错的3D配置，而由于存在大缺失楔形的分辨率存在限制。

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