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

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
Materials 2015, 8(4), 1924-1933; https://doi.org/10.3390/ma8041924
Received: 5 January 2015 / Revised: 9 April 2015 / Accepted: 13 April 2015 / Published: 21 April 2015
(This article belongs to the Section Structure Analysis and Characterization)
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)
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MDPI and ACS Style

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.

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