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Materials 2015, 8(4), 1924-1933; doi:10.3390/ma8041924

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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Author to whom correspondence should be addressed.
Academic Editor: Jung Ho Je
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)
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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)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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