Three-Dimensional Imaging of Dislocations in a Ti–35mass%Nb Alloy by Electron Tomography
AbstractWe 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. View Full-Text
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Sato, K.; Semboshi, S.; Konno, T.J. Three-Dimensional Imaging of Dislocations in a Ti–35mass%Nb Alloy by Electron Tomography. Materials 2015, 8, 1924-1933.
Sato K, Semboshi S, Konno TJ. Three-Dimensional Imaging of Dislocations in a Ti–35mass%Nb Alloy by Electron Tomography. Materials. 2015; 8(4):1924-1933.Chicago/Turabian Style
Sato, Kazuhisa; Semboshi, Satoshi; Konno, Toyohiko J. 2015. "Three-Dimensional Imaging of Dislocations in a Ti–35mass%Nb Alloy by Electron Tomography." Materials 8, no. 4: 1924-1933.