A5076556458- Microstructure and Mechanical Properties of Steels
- Microstructure and mechanical properties
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Magnetic Properties and Applications
- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Metallurgy and Material Forming
- Machine Learning in Materials Science
- Electron and X-Ray Spectroscopy Techniques
- Electronic and Structural Properties of Oxides
- Advanced ceramic materials synthesis
- Hydrogen embrittlement and corrosion behaviors in metals
- High-pressure geophysics and materials
- Powder Metallurgy Techniques and Materials
- Advanced Materials Characterization Techniques
- Laser-Plasma Interactions and Diagnostics
- Advanced materials and composites
- X-ray Spectroscopy and Fluorescence Analysis
- Aluminum Alloys Composites Properties
- Force Microscopy Techniques and Applications
- Phase-change materials and chalcogenides
- Metallic Glasses and Amorphous Alloys
Technical University of Denmark
2019-2024
European Synchrotron Radiation Facility
2018-2022
Danish Geotechnical Society
2019
Middle East Technical University
2016
Abstract We present an instrument for dark-field x-ray microscopy installed on beamline ID06 of the ESRF — first its kind. Dark-field uses full field illumination sample and provides three-dimensional (3D) mapping micro-structure lattice strain in crystalline matter. It is analogous to electron that objective lens magnifies diffracting features sample. The use high-energy synchrotron x-rays, however, means these can be large deeply embedded. 3D movies acquired with a time resolution seconds...
Dark-field X-ray microscopy movies reveal how patterns of microscopic defects in bulk aluminum destabilize from 97-99% melting.
Dark-field X-ray microscopy is a new full-field imaging technique for nondestructively mapping the structure of deeply embedded crystalline elements in three dimensions. Placing an objective diffracted beam generates magnified projection image local volume. By placing detector back focal plane, high-resolution reciprocal space maps are generated Geometrical optics used to provide analytical expressions resolution and range associated field view sample plane. To understand effects coherence...
Three-dimensional X-ray diffraction microscopy, 3DXRD, has become an established tool for orientation and strain mapping of bulk polycrystals. However, it is limited to a finite spatial resolution ∼1.5-3 µm. Presented here high-resolution modality the technique, HR-3DXRD, 3D submicrometre-sized crystallites or subgrains with high angular resolution. Specifically, method targeted visualization metal microstructures at industrially relevant degrees plastic deformation. Exploiting intrinsic...
Strength, ductility, and failure properties of metals are tailored by plastic deformation routes. Predicting these requires modeling the structural dynamics stress evolution taking place on several length scales. Progress has been hampered a lack representative 3D experimental data at industrially relevant degrees deformation. We present an X-ray imaging based mapping aluminum polycrystal deformed to ultimate tensile strength (32% elongation). The extensive dataset reveals significant...
The electric-field-induced and temperature induced dynamics of domains, defects, phases play an important role in determining the macroscopic functional response ferroelectric piezoelectric materials. However, distinguishing quantifying these phenomena remains a persistent challenge that inhibits our understanding fundamental structure-property relationships. In situ dark field x-ray microscopy is new experimental technique for real space mapping lattice strain orientation bulk this paper,...
We present a multi-purpose mirror furnace designed for synchrotron X-ray experiments. The is optimized specifically dark-field microscopy (DFXM) of crystalline materials at the beamline ID06 ESRF. can reach up to ~1600{\deg}C with stability better than 2{\deg}C, and heating cooling rates 30{\deg}C/s. contact-less design enables samples be heated either in air or controlled atmosphere capillary tube. temperature was calibrated via thermal expansion an a-iron grain. Temperature profiles y z...
Abstract We present a multi-scale study of recrystallization annealing an 85% cold rolled Fe-3%Si-0.1%Sn alloy using combination dark field X-ray microscopy (DFXM), synchrotron diffraction (SXRD), and electron backscatter (EBSD). Grains interest from high stored energy (HSE) regions in 200μm-thick sample are studied DFXM during isothermal annealing. The intra-granular structure the as deformed grain reveals deformation bands separated by ≈ 3–5° misorientation. Geometrically Necessary...
Strength, ductility, and failure properties of metals are tailored by plastic deformation routes. Predicting these requires modeling the structural dynamics stress evolution taking place on several length scales. Progress has been hampered a lack representative 3D experimental data at industrially relevant degrees deformation. We present an X-ray imaging based mapping aluminum polycrystal deformed to ultimate tensile strength (32% elongation). The extensive dataset reveals significant...
We use dark-field x-ray microscopy to reveal evidence of subtle structural heterogeneity in BaTiO3 single crystals at temperatures 150 °C—well above the Curie temperature 125 °C. The exhibits domain-like ordering on scale several micrometers, pronounced curvature, and a preference for ⟨110⟩ lattice directions. Complementary high-resolution reciprocal space measurements suggest that features originate from point defects (most likely oxygen vacancies) coalesce along pre-existing domain walls...
Abstract We present a multi-scale study of recrystallization annealing an 85% cold rolled Fe-3%Si alloy using combination dark field X-ray microscopy (DFXM), synchrotron diffraction (SXRD), and electron backscatter (EBSD). The intra-granular structure the as-deformed grain reveals deformation bands separated by ≈ 3–5°misorientation. monitor structural evolution recrystallized embedded in bulk, from early stages to 65% overall through isothermal steps. Results show that interest (GOI) grows...
Connecting a bulk material's microscopic defects to its macroscopic properties is an age-old problem in materials science. Long-range interactions between dislocations (line defects) are known play key role how deform or melt, but we lack the tools connect these dynamics properties. We introduce time-resolved dark-field X-ray microscopy directly visualize move and interact over hundreds of micrometers, deep inside aluminum. With real-time movies, reveal thermally-activated motion that...
We present a multiscale study on the recovery and recrystallization of Fe-Si-Sn alloys using combination dark field X-ray microscopy (DFXM), synchrotron diffraction (SXRD) electron backscatter (EBSD). A grain interest embedded in 200-micron thick, heavily deformed (85% reduction size) sample is studied DFXM at consecutive isothermal annealing steps. The intra-granular structure as-deformed reveals deformation bands separated by 3–5◦ misorientation. During early stages annealing, cells with...