Nanoscale imaging of the full strain tensor of specific dislocations extracted from a bulk sample

Felix Hofmann, Nicholas W. Phillips, Suchandrima Das, Phani Karamched, Gareth M. Hughes, James O. Douglas, Wonsuk Cha, and Wenjun Liu
Phys. Rev. Materials 4, 013801 – Published 14 January 2020
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Abstract

Lattice defects play a key role in determining the properties of crystalline materials. Probing the three-dimensional (3D) lattice strains that govern their interactions remains a challenge. Bragg coherent diffraction imaging (BCDI) allows strain to be measured with nanoscale 3D resolution. However, it is currently limited to materials that form microcrystals. Here we introduce a technique that allows the manufacture of BCDI samples from bulk materials. Using tungsten as an example, we show that focused ion-beam machining can be used to extract, from macroscopic crystals, micron-sized BCDI samples containing specific preselected defects. To interpret the experimental data, we develop a displacement-gradient-based analysis for multireflection BCDI. This allows accurate recovery of the full lattice strain tensor from samples containing multiple dislocations. These capabilities open the door to BCDI as a microscopy tool for studying complex real-world materials.

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  • Received 5 July 2019
  • Revised 8 October 2019

DOI:https://doi.org/10.1103/PhysRevMaterials.4.013801

©2020 American Physical Society

Physics Subject Headings (PhySH)

Accelerators & BeamsCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Felix Hofmann1,*, Nicholas W. Phillips1, Suchandrima Das1, Phani Karamched2, Gareth M. Hughes2, James O. Douglas2, Wonsuk Cha3, and Wenjun Liu3

  • 1Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, United Kingdom
  • 2Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, United Kingdom
  • 3Advance Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, USA

  • *felix.hofmann@eng.ox.ac.uk

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Vol. 4, Iss. 1 — January 2020

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