A5011734259- Advanced Materials Characterization Techniques
- Hydrogen embrittlement and corrosion behaviors in metals
- Diamond and Carbon-based Materials Research
- Fusion materials and technologies
- Aluminum Alloy Microstructure Properties
- Force Microscopy Techniques and Applications
- Microstructure and mechanical properties
- Ion-surface interactions and analysis
- Electronic and Structural Properties of Oxides
- Aluminum Alloys Composites Properties
- nanoparticles nucleation surface interactions
- Minerals Flotation and Separation Techniques
- Semiconductor materials and devices
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Nuclear Materials and Properties
- High Temperature Alloys and Creep
- Catalytic Processes in Materials Science
- Ammonia Synthesis and Nitrogen Reduction
- Extraction and Separation Processes
- Additive Manufacturing Materials and Processes
- Magnetic and transport properties of perovskites and related materials
- Magnetic Field Sensors Techniques
- Metallurgical Processes and Thermodynamics
- Multiferroics and related materials
Norwegian University of Science and Technology
2022-2025
Groupe de Physique des Matériaux
2016-2023
Université de Rouen Normandie
2017-2023
Centre National de la Recherche Scientifique
2014-2023
Institut National des Sciences Appliquées Rouen Normandie
2017-2023
Normandie Université
2017-2021
The precipitation sequence in Al–Zn–Mg alloys has been subject to many revisions over the years as more structural details of early-stage Guinier-Preston (GP) zones and precipitates have uncovered. To further investigate this, a 7003 aluminium alloy naturally aged for one year was subjected artificial ageing at 140 °C evolution precipitates. Scanning transmission electron microscopy coupled with atom probe tomography hardness measurements characterise precipitate structure chemistry...
Irradiation of reactor pressure vessel (RPV) steels causes the formation nanoscale microstructural features (termed radiation damage), which affect mechanical properties vessel. A key tool for characterizing these is atom probe tomography (APT), due to its high spatial resolution and ability identify different chemical species in three dimensions. Microstructural observations using APT can underpin development a mechanistic understanding defect formation. However, with analyses there are...
We summarize the findings from an interlaboratory study conducted between ten international research groups and investigate use of commonly used maximum separation distance local concentration thresholding methods for solute clustering quantification. The objectives are: to bring clarity range applicability methods; identify existing and/or needed modifications; interpretation past published data. Participants collected experimental data a proton-irradiated 304 stainless steel analyzed...
Abstract Quantifying chemical compositions around nanovoids is a fundamental task for research and development of various materials. Atom probe tomography (APT) scanning transmission electron microscopy (STEM) are currently the most suitable tools because their ability to materials at nanoscale. Both techniques have limitations, particularly APT, insufficient understanding void imaging. Here, we employ correlative APT STEM approach investigate imaging process reveal that voids can lead...
The cyclic application of mechanical stress to aluminum alloys at room temperature, referred as ageing, continuously injects vacancies, enabling dynamic precipitation a fine distribution solute clusters. These are uniformly distributed throughout the bulk and responsible for enhancing properties comparable values T6 conditions obtained by conventional artificial aging. atomic structure clusters in two Al–Zn–Mg (-Cu) is studied using atomically resolved transmission electron microscopy, their...
Shifting toward sustainability and low carbon emission necessitates recycling. Aluminum alloys can be recycled from postconsumer scrap with approximately 5% of the energy needed to produce same amount primary alloys. However, presence certain alloying elements, such as copper zinc, impurities in Al-Mg-Si is difficult avoid. This work has investigated influence tiny concentrations Cu (0.05 wt %) Zn (0.06 %), individually combination, on precipitate crystal structures peak aged overaged...
Abstract Oxide heterostructures exhibit a vast variety of unique physical properties. Examples are unconventional superconductivity in layered nickelates and topological polar order (PbTiO 3 ) n /(SrTiO superlattices. Although it is clear that variations oxygen content crucial for the electronic correlation phenomena oxides, remains major challenge to quantify their impact. Here, we measure chemical composition multiferroic (LuFeO 9 /(LuFe 2 O 4 1 superlattices, mapping correlations between...
Abstract Atom probe tomography enables three-dimensional mapping of elements within material volumes with subnanometer resolution. Standard tomographic reconstruction methods rely on simplified assumptions regarding key parameters such as the field factor and image compression factor, which can introduce inaccuracies. In this study, we apply a dynamic approach that adjusts these in response to evolving morphology specimen during evaporation. Our results show significantly improves accuracy...
Abstract We introduce an efficient, automated computational approach for analyzing interfaces within atom probe tomography datasets, enabling quantitative mapping of their thickness, composition, as well the Gibbsian interfacial excess each solute. Detailed evaluation experimental dataset indicates that compared with composition map, map is more robust and exhibits a relatively higher resolution to reveal compositional variations. By field evaporation simulations predefined emitter mimicking...
Layered oxides exhibit high ionic mobility and chemical flexibility, attracting interest as cathode materials for lithium-ion batteries the pairing of hydrogen production carbon capture. Recently, layered emerged highly tunable semiconductors. For example, by introducing anti-Frenkel defects, electronic hopping conductance in hexagonal manganites was increased locally orders magnitude. Here, we demonstrate local acceptor donor doping Er(Mn,Ti)O$_3$, facilitated splitting such defects under...
Atom probe tomography (APT) analysis conditions play a major role in the composition measurement accuracy. Preferential evaporation, which significantly biases apparent composition, more than other well-known phenomena APT, is strongly connected to those conditions. One way optimize them, order have most accurate measurement, therefore be able predict and then estimate their influence on composition. An analytical model proposed quantify preferential evaporation. This applied three different...
Natural and artificial ageing treatments are compared with by cyclic deformation at room temperature. Atom probe tomography transmission electron microscopy revealed that a fine distribution of GP-zones, was responsible for the strength after ageing. Ten days further natural allowed these early-stage clusters to grow into more stable ones, thereby improving mechanical response. This resulted in similar tensile uniform elongation as peak aged condition It found fracture samples occurred...
Abstract Reconstructions in atom probe tomography (APT) are biased by image distortions arising from dynamic changes of the specimen geometry that controls projection. Despite strong efforts to build realistic models for understanding and reproducing artifacts, current too slow or not adapted be routinely used correction approaches. To understand APT imaging process real size samples submitted experimental conditions electric field temperature, we propose an alternative simulation tool based...
Lithium dendrites belong to the key challenges of solid-state battery research. They are unavoidable due imperfect nature surfaces containing defects a critical size that can be filled by lithium until fracturing solid electrolyte. The penetration Li metal occurs along propagating crack short circuit takes place. We hypothesise ion implantation used introduce stress states into Li6.4La3Zr1.4Ta0.6O12 which enable an effective deflection and arrest dendrites. compositional microstructural...
Polar discontinuities, as well compositional and structural changes at oxide interfaces can give rise to a large variety of electronic ionic phenomena. In contrast earlier work focused on domain walls epitaxial systems, this investigates the relation between polar discontinuities local chemistry grain boundaries in polycrystalline ferroelectric ErMnO3 . Using orientation mapping scanning probe microscopy (SPM) techniques, material is demonstrated develop charged with enhanced conductance. By...
Abstract Lithium dendrites belong to the key challenges of solid‐state battery research. They are unavoidable due imperfect nature surfaces containing defects a critical size that can be filled by lithium until fracturing solid electrolyte. The penetration Li metal occurs along propagating crack short circuit takes place. It is hypothesized ion implantation used introduce stress states into 6.4 La 3 Zr 1.4 Ta 0.6 O 12 which enables an effective deflection and arrest dendrites. compositional...