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




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Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan





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Academic Editor: Jung Ho Je

Abstract 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. View Full-Text

Keywords: electron tomography; dislocations; 3D configurations; Ti–Nb; scanning transmission electron microscopy STEM electron tomography; dislocations; 3D configurations; Ti–Nb; scanning transmission electron microscopy STEM





Author: Kazuhisa Sato * , Satoshi Semboshi and Toyohiko J. Konno

Source: http://mdpi.com/



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