A5076921171- Fusion materials and technologies
- Nuclear Materials and Properties
- Microstructure and mechanical properties
- Advanced materials and composites
- Metal and Thin Film Mechanics
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- High-Velocity Impact and Material Behavior
- Advanced ceramic materials synthesis
- Numerical methods in engineering
- High Temperature Alloys and Creep
- Advanced Materials Characterization Techniques
- Ion-surface interactions and analysis
- Welding Techniques and Residual Stresses
- Aluminum Alloy Microstructure Properties
- Microstructure and Mechanical Properties of Steels
- Copper Interconnects and Reliability
- Metallic Glasses and Amorphous Alloys
- Graphite, nuclear technology, radiation studies
- Optical measurement and interference techniques
- Rock Mechanics and Modeling
- Nonlocal and gradient elasticity in micro/nano structures
- Force Microscopy Techniques and Applications
- Metallurgy and Material Forming
Culham Centre for Fusion Energy
2015-2024
United Kingdom Atomic Energy Authority
2017-2024
Culham Science Centre
2015-2024
Imperial College London
2022
University of Oxford
2015-2019
In fusion reactors, surfaces of plasma facing components (PFCs) are exposed to high heat and particle flux. Tungsten Copper alloys primary candidates for materials (PFMs) coolant tube materials, respectively, mainly due thermal conductivity and, in the case tungsten, its melting point. this paper, recent understandings future issues on responses tungsten Cu environments (high flux (including T He), flux, neutron doses) reviewed. This review paper includes; Tritium retention (K. Schmid M....
The ITER project requires additional heating by two neutral beam injectors, each accelerating to 1 MV a 40 A of negative deuterium ions, deliver the plasma power about 17 MW for one hour. As these requirements have never been experimentally met, it was recognized as necessary setup test facility, PRIMA (Padova Research on Megavolt Accelerator), in Italy, including full-size ion source, SPIDER, and prototype whole injector, MITICA, aiming develop injectors be installed ITER. This realization...
Strain gradients have been cast in the form of geometrically-necessary dislocations (GND) to relate length-scale dependence strength and determine potential sites for failure initiation. The literature contains various different incompatibility measures, main ones being: total (∇×Fp), rate large displacements (∇×γ̇anaFp), slip gradient (∇γ̇a). Here these approaches are compared rigorously first time. Obtaining GND densities when using is a rank-deficit linear problem, solved by singular...
Abstract Results of the first dust survey in JET with ITER-Like Wall (JET-ILW) are presented. The sampling was performed using adhesive stickers from divertor tiles where greatest material deposition detected after JET-ILW campaign 2011 – 2012. emphasis especially on and analysis metal particles (Be W) aim to determine composition, size, surface topography internal structure a large set methods: high-resolution scanning transmission electron microscopy, focused ion beam, diffraction also...
Only limited data exist on the effect of neutron irradiation brittle to ductile transition (BDT) in tungsten. This work investigates increase temperature (BDTT) following 1.67 displacements per atom, using four-point bend tests over a range temperatures (623–1173 K) and strain rates (3.5 × 10−7 - 2.5 10−5 s−1). The BDTT was found by 500 K after irradiation. activation energy for BDT determined Arrhenius analysis tests. Nanoindentation strain-rate jump were used characterise volume...
Hydrogen pick-up and hydride precipitation can lead to embrittlement fracture strength reduction of nuclear fuel cladding tubes made Zircaloy. Plastic deformation packets its interaction with local plasticity in the zirconium matrix is a key linkage microstructure feature structural integrity hydrided polycrystalline bulk This work focuses on explicit representation from high spatial resolution electron backscatter diffraction onto crystal finite element model for capturing understanding...
Conventional crystal plasticity (CP) solvers are based on a Newton-Raphson (NR) approach which use an initial guess for the free variables (often stress) to be solved. These limited by finite interval of convergence and often fail when variable falls outside this interval. Solution failure results in reduction time increment solved, thus CP solver is bottleneck determines computational cost simulation. The numerical stability slip law its inverted form offers that isn't vulnerable poor...
The Spherical Tokamak for Energy Production (STEP) environment will include magnetic, thermal, mechanical and environmental loads far greater than those seen in the Joint European Torus campaigns of past decade or currently contemplated ITER. Greater still are neutron peak dose rates 10
Abstract Superconducting material enables fusion reactor magnet concepts to operate with current densities that would melt materials non-zero resistance. The application of superconducting is considered essential for net-positive power machines. Catastrophic damage can occur when superconductivity lost and the generates heat. This scenario called a quench. Stabilizer carries (typically copper) during quench focus this work.

Irradiation-induced defects store energy in Cu...
Abstract The high source stability and brightness of field emission gun equipped scanning electron microscopes (SEM) makes them ideal for high‐resolution digital image correlation (HRDIC). However, their initial capital cost can be prohibitive research organisations groups. Conventional thermionic SEMs using either a tungsten hairpin or LaB 6 filament are far more widespread due to lower cost. Whilst it is understood that overall performance ultimate resolution than SEMs, we propose there no...
Abstract Scanning electron microscopy‐based high‐resolution digital image correlation (HRDIC) is now an established technique, providing full‐field strain and displacement measurement at the microscale. Techniques for generating speckle patterns sub‐micron mapping can often be either substrate dependent or rely on applying aggressive conditions which may alter microstructure of interest damage in highly sensitive materials. We detail a modification methodology successfully applied literature...
We analyse spherical nanoindentation of single crystal copper using two different indenter tips radii 7.4 and 27 µm. The surface deformation surrounding the indents was measured atomic force microscopy elastic rotation fields under were electron diffraction transmission techniques. Using load-displacement, relief, plastic zone size, field removed ambiguity in optimal slip hardening law parameters a three parameter strain gradient plasticity model. In addition to geometrically necessary...
Understanding the residual stress state in brazed joints is crucial for operational design and lifetime performance of part service. High-magnitude stresses are expected joined materials following cooling from brazing temperatures (≈ 950 °C) due to large mismatches thermal mechanical properties. This paper aims at further understanding caused when tungsten copper 316L austenitic steel using a eutectic gold-copper alloy. These configurations potentially useful future diverter designs. Finite...
Tungsten is considered as a primary material for the divertor and first wall in many fusion reactor designs. There has been further interest nano-structured multi-phase tungsten alloys composites, such oxide dispersion strengthened alloys, where interfaces may be harnessed defect sinks to improve irradiation resilience, whilst also improving base mechanical strength, potentially ductility. Here we investigate concept of tungsten-based ‘bcc-superalloys’ within W-Ti-Fe ternary system,...
Abstract The effects of radiation damage on materials are strongly dependant temperature, making it arguably the most significant parameter concern in nuclear engineering. Owing to challenges and expense irradiating testing materials, material property data is often limited few irradiation conditions variants. A new technique has been developed which enables investigation samples subject a thermal gradient, whereby wealth over range temperatures produced from single experiment. results...