Nano-scale imaging of the full strain tensor of specific dislocations extracted from a bulk sample

Abstract

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

arXiv comment26 pages, 6 figures

References in corpus (5)

• X-ray image reconstruction from a diffraction pattern alone
• Three-dimensional coordinates of individual atoms in materials revealed by electron tomography
• Dislocation Networks and the Microstructural Origin of Strain Hardening
• Anisotropic nano-scale resolution in 3D Bragg coherent diffraction imaging
• Mapping data between sample and detector conjugated spaces in Bragg coherent diffraction imaging

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• Refinements for Bragg coherent X-ray diffraction imaging: Electron backscatter diffraction alignment and strain field computation
• Computation of Burgers Vectors from Elastic Strain and Lattice Rotation Data
• Manipulating Metastability: Quenched Control of Topological Defects in Multiferroics
• Low temperature state in strontium titanate microcrystals using in situ multi-reflection Bragg coherent X-ray diffraction imaging
• Bragg Coherent Imaging of nanoprecipitates: role of superstructure reflections