A5045954769- Advanced X-ray Imaging Techniques
- Microstructure and mechanical properties
- Advanced Electron Microscopy Techniques and Applications
- Microstructure and Mechanical Properties of Steels
- Phase-change materials and chalcogenides
- Ferroelectric and Piezoelectric Materials
- Glass properties and applications
- Force Microscopy Techniques and Applications
- Metal and Thin Film Mechanics
- Molecular Junctions and Nanostructures
- Material Dynamics and Properties
- X-ray Spectroscopy and Fluorescence Analysis
- Aluminum Alloy Microstructure Properties
- Electronic and Structural Properties of Oxides
- Electron and X-Ray Spectroscopy Techniques
- Aluminum Alloys Composites Properties
- Multiferroics and related materials
- Magnesium Alloys: Properties and Applications
- Quantum Dots Synthesis And Properties
- Metallurgy and Material Forming
- Advanced Semiconductor Detectors and Materials
- Magnetic Properties and Applications
- X-ray Diffraction in Crystallography
- Advanced Battery Materials and Technologies
- Chalcogenide Semiconductor Thin Films
European Synchrotron Radiation Facility
2017-2025
Université Grenoble Alpes
2020-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2020-2023
CEA Grenoble
2020-2023
CEA LETI
2020-2021
Institut polytechnique de Grenoble
2021
OnderzoeksCentrum voor de Aanwending van Staal
2018-2020
Sorbonne Université
2016-2018
Laboratoire de Physique Théorique de la Matière Condensée
2016-2018
University of Liège
2015-2018
Functional and structural ceramics have become irreplaceable in countless high-tech applications. However, their inherent brittleness tremendously limits the application range and, despite extensive research efforts, particularly short cracks are hard to combat. While local plasticity carried by mobile dislocations allows desirable toughness metals, high bond strength is widely believed hinder dislocation-based toughening of ceramics. Here, we demonstrate possibility induce engineer a...
Thermomechanical processing such as annealing is one of the main methods to tailor mechanical properties materials, however, much unknown about reorganization dislocation structures deep inside macroscopic crystals that give rise those changes. Here, we demonstrate self-organization upon high-temperature in a mm-sized single crystal aluminum. We map large embedded 3D volume ([Formula: see text] [Formula: text]m[Formula: text]) using dark field X-ray microscopy (DFXM), diffraction-based...
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...
This article presents an X-ray microscopy approach for mapping deeply embedded dislocations in three dimensions using a monochromatic beam with low divergence. Magnified images are acquired by inserting objective lens the diffracted beam. The strain fields close to core of give rise scattering at angles where weak conditions obtained. Analytical expressions derived image contrast. While use implies integration over two directions reciprocal space, scanning aperture back focal plane...
Abstract During cyclic loading, localization of intragranular deformation due to crystallographic slip acts as a precursor for crack initiation, often at coherent twin boundaries. A suite high-resolution synchrotron X-ray characterizations, coupled with crystal plasticity simulation, was conducted on polycrystalline nickel-based superalloy microstructure near parent-twin boundary in order understand the behavior this critical, 3D microstructural configuration. Dark-field microscopy spatially...
Dark-field X-ray microscopy movies reveal how patterns of microscopic defects in bulk aluminum destabilize from 97-99% melting.
A Python package for the analysis of dark-field X-ray microscopy (DFXM) and rocking curve imaging (RCI) data is presented. DFXM a non-destructive diffraction technique that provides three-dimensional maps lattice strain orientation. The darfix enables fast processing visualization these data, providing user with essential tools to extract information from acquired images in intuitive manner. These can be either imported as library components or accessed through graphical interface an Orange...
X-ray microscopy at photon energies above 15 keV is very attractive for the investigation of atomic and nanoscale properties technologically relevant structural bio materials. This method limited by quality optics. Multilayer Laue lenses (MLLs) have potential to make a major impact in this field because, as compared other optics, they become more efficient effective with increasing energy. In work, MLLs were utilized hard X-rays up 34.5 keV. The design, fabrication, performance these are...
Abstract During plastic deformation of metals and alloys, dislocations self-organise in cells, which subsequently continuously decrease size. How when these processes take place has remained elusive, because observations the structural dynamics bulk have not been feasible. We here present X-ray diffraction microscopy sequences evolution during tensile a mm-sized aluminium (111) single crystal. The formation subsequent development 40,000 cells are visualised. form stochastic, isotropic...
Martian meteorites offer insights into magmatic processes and impact history, critical for understanding terrestrial planet evolution. Among over 100 identified (4.4 Ga-165 Ma; Nyquist et al., 2001; Moser 2013), shergottites are the most common, resembling basalts (McSween, 2015; Kizovski 2019) but showing strong shock metamorphism. Key features include plagioclase-to-maskelynite transitions, olivine pyroxene mosaicism, planar fractures in (Stöffler 1986; Walton & Herd,...
Abstract If quenched fast enough, a liquid is able to avoid crystallization and will remain in metastable supercooled state down the glass transition, with an important increase viscosity upon further cooling. There are differences way liquids relax as they approach rapid or slow variation dynamic quantities under moderate temperature changes, simple means quantify such variations provided by concept of fragility. Here, we report molecular dynamics simulations typical network-forming glass,...
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...
Assessing the local residual stress and orientation with nanometer resolution within embedded steel grains has remained challenging. Here we use an advanced synchrotron technique, dark field X-ray microscopy to map 3D lattice variations, including both crystallographic strain, two pro-eutectoid ferrite in pearlitic steel. We found variation up 0.5° compressive elastic strain 1.8 × 10−3 are present as-manufactured sample. There is no direct correlation between measured orientation. The origin...
The structures, strain fields, and defect distributions in solid materials underlie the mechanical physical properties across numerous applications. Many modern microstructural microscopy tools characterize crystal grains, domains defects required to map lattice distortions or deformation, but are limited studies of (near) surface. Generally speaking, such cannot probe structural dynamics a way that is representative bulk behavior. Synchrotron X-ray diffraction based imaging has long mapped...
Dark-field X-ray microscopy (DFXM) is a high-resolution, X-ray-based diffraction microstructure imaging technique that uses an objective lens aligned with the diffracted beam to magnify single Bragg reflection. DFXM can be used spatially resolve local variations in elastic strain and orientation inside embedded crystals high spatial (~ 60 nm) angular 0.001°) resolution. However, as many high-resolution techniques, there trade-off between resolution field of view, it often desirable enrich...
Select Raman scattering and modulated differential scanning calorimetry (DSC) experiments on specially homogenized binary Ge x Se 100– S chalcogenide glasses, supported by ab initio MD simulations are undertaken. In both chalcogenides, the glasses exhibit a super‐strong behavior (with melt fragility index, m ( ) < 20) in 20(1)% 26(1)% composition range, defining window, with > 20 as one goes away from window. Remarkably, molecular dynamics (MD) confirm existence of Furthermore,...
The effect of electron irradiation on aromatic thiolate self-assembled monolayers (SAMs) with oligophenyl, acene, and oligo(phenylene ethynylene) (OPE) backbones, containing from one to three phenyl rings, was studied, emphasis the basic irradiation-induced processes performance these films as negative resists in lithography. All exhibited similar behavior upon irradiation, clear dominance cross-linking, taking hold systems at already very early stages treatment. cross sections for...