A5038013471- Fusion materials and technologies
- Nuclear Materials and Properties
- Advanced X-ray Imaging Techniques
- Microstructure and Mechanical Properties of Steels
- Crystallography and Radiation Phenomena
- Microstructure and mechanical properties
- Ion-surface interactions and analysis
- Synthesis and properties of polymers
- Hydrogen embrittlement and corrosion behaviors in metals
- X-ray Spectroscopy and Fluorescence Analysis
- Metal and Thin Film Mechanics
- Astrophysical Phenomena and Observations
- Silicone and Siloxane Chemistry
- Advanced materials and composites
- Advanced Electron Microscopy Techniques and Applications
- Advanced Memory and Neural Computing
- 3D IC and TSV technologies
- Additive Manufacturing and 3D Printing Technologies
- Semiconductor materials and devices
- Epoxy Resin Curing Processes
- Electronic Packaging and Soldering Technologies
- Powder Metallurgy Techniques and Materials
- Laser-Plasma Interactions and Diagnostics
- nanoparticles nucleation surface interactions
- Metallurgy and Cultural Artifacts
University of Oxford
2020-2025
Engineering Systems (United States)
2020-2023
Science Oxford
2021
Australian National University
2018-2019
Aixtron (Germany)
2014-2016
Korea Basic Science Institute
2000
A dynamic Verilog-A resistive random access memory (RRAM) compact model, including cycle-to-cycle variation, is developed for circuit/system explorations. The model not only captures dc and ac behavior, but also includes intrinsic fluctuations variations. methodology to systematically calibrate the parameters with experiments presented illustrated a broad set of experimental data, multilayer RRAM. physical meanings various are discussed. An example applying RRAM cell ternary...
The Korea Superconducting Tokamak Advanced Research (KSTAR) project is the major effort of national fusion programme Republic Korea. Its aim to develop a steady state capable advanced superconducting tokamak establish scientific and technological basis for an attractive reactor. parameters are: radius 1.8 m, minor 0.5 toroidal field 3.5 T plasma current 2 MA, with strongly shaped cross-section double null divertor. initial pulse length provided by poloidal magnet system 20 s, but can be...
Gen IV nuclear reactors promise better safety, economic benefits and a potential path to reducing carbon emissions. The liquid lead-bismuth eutectic (LBE) cooled fast reactor is key concept. This study investigates the corrosion of T91 steel, candidate structural material for reactors, exposed LBE. Specifically, we focus on dissociation Cr carbides overall depletion adjacent interface. Our results suggest correlation between phase changes in most likely ferritization. We have analysed...
Hydrogen embrittlement (HE) poses a significant challenge to the durability of materials used in hydrogen production and utilization. Disentangling competing nanoscale mechanisms driving HE often relies on simulations electron-transparent sample techniques, limiting experimental insights into hydrogen-induced dislocation behavior bulk materials. This study employs situ Bragg coherent X-ray diffraction imaging track three-dimensional strain field evolution during charging grain austenitic 316...
We investigated the effect of nano-structuring by high-pressure torsion (HPT) on irradiation performance Eurofer-97. Material was deformed to shear strains from 0 ∼230, and then exposed Fe3+ doses 0.01 0.1 displacements-per-atom (dpa). Nanoindentation hardness increases monotonically with deformation, for undeformed material. For both damage levels, less hardening is observed in severely This most prominent strain range ∼60 ∼160, suggesting that may provide an approach reducing hardening.
Ferritic/martensitic steels will be used as structural components in next generation nuclear reactors. Their successful operation relies on an understanding of irradiation-induced defect behaviour the material. In this study, Fe and FeCr alloys (3–12%Cr) were irradiated with 20 MeV Fe-ions at 313 K to doses ranging between 0.00008 dpa 6.0 dpa. This dose range covers six orders magnitude, spanning low, transition high regimes. Lattice strain hardness material characterised micro-beam Laue...
Determining the mechanisms for irradiation-induced ductility loss is crucial design of reactor structural components. Here, deformation characteristics around nanoindents in Fe and Fe10Cr irradiated with ions to ∼1 displacement-per-atom at 313 K are non-destructively studied. Slip steps surrounding indicate that localised materials. Lattice rotation strain fields near indent site show over 87% confinement plasticity material. Cr has little effect on changes pile-up topography fields,...
Severe plastic deformation changes the microstructure and properties of steels, which may be favourable for their use in structural components nuclear reactors. In this study, high-pressure torsion (HPT) was used to refine grain structure Eurofer-97, a ferritic/martensitic steel. Electron microscopy X-ray diffraction were characterise microstructural changes. Following HPT at room temperature maximum shear strain 230, average size reduced by factor ∼30, with marked increase high-angle...
Recrystallisation has been identified as a critical issue for the ITER divertor but currently synergistic effects of heat and particle bombardment on tungsten recrystallisation are still unclear. In this study, was exposed to helium plasma under range sample temperatures (573 K–1073 K) ion fluences (1024–1025 m−2) followed by annealing at (1373 K–1673 K). It is quantitatively found that larger nano-bubbles form higher during exposure due increased nano-bubble mobility coalescence. The...
This paper presents the impact of thermal annealing and other process parameters on hybrid bonding performance in a vacuum anneal batch system potential implications for technology roadmap 3D chip stacking. The effects temperature deviation, surface oxidation sub-atmospheric conditions during annealing, as evaluated by strength void analysis, dielectric film deposited wafers are presented. excellent within-wafer (WiW) wafer-to-wafer (WtW) uniformity, much low particle O2 level, well reduced...
Focused ion beam (FIB) techniques are commonly used to machine, analyse and image materials at the micro- nanoscale. However, FIB modifies integrity of sample by creating defects that cause lattice distortions. Methods have been developed reduce FIB-induced strain, however these protocols need be evaluated for their effectiveness. Here we use non-destructive Bragg coherent X-ray diffraction imaging study in situ annealing FIB-milled gold microcrystals. We simultaneously measure two...
Abstract Traditional fibre push-outs for the evaluation of interfacial properties in long ceramic matrix composites present their limitations—solutions which are addressed this work by introducing novel trench push-out test. The makes use a FIB milling system and an SEM in-situ nanoindenter to probe pushed into underneath, allowing observations be directly correlated with micromechanical events. SiC f /BN/SiC composites—candidate material turbine engines—were used as model materials work....
Corrosion is a major concern for many industries, as corrosive environments can induce structural and morphological changes that lead to material dissolution accelerate failure. The progression of corrosion depends on nanoscale morphology, stress, defects present. Experimentally monitoring this complex interplay challenging. Here we implement in situ Bragg coherent X-ray diffraction imaging (BCDI) probe the Co-Fe alloy microcrystal exposed hydrochloric acid (HCl). By measuring five...
In this paper, to meet the demand placed on Polyimide materials in Fan Out Wafer and Panel Level Processing applicable Heterogeneous Integration, thermal, mechanical, dielectric properties were studied for different types of Poly-Benz-Oxazole (PBO) materials, such as HD-4100, HD-8820 HD7110, a function process parameters, under atmospheric vacuum conditions. Vacuum cure results higher thermal stability with lower outgassing HD-4100 films. HD-7110 appears increase strength, but no similar...
Abstract Understanding the mechanisms of plasticity in structural steels is essential for operation next-generation fusion reactors. This work on deformation behaviour FeCr, focusses distinguishing nucleation dislocations to initiate plasticity, from their propagation through material. Fe3Cr, Fe5Cr, and Fe10Cr were irradiated with 20 MeV Fe 3+ ions at room temperature doses 0.008 dpa 0.08 dpa. Nanoindentation was then carried out Berkovich spherical indenter tips. Our results show that...
Bragg coherent X-ray diffraction imaging (BCDI) allows the 3D measurement of lattice strain along scattering vector for specific microcrystals. If at least three linearly independent reflections are measured, variation full tensor within microcrystal can be recovered. However, this requires knowledge crystal orientation, which is typically attained via estimates based on geometry or synchrotron microbeam Laue measurements. Presented here an alternative method to determine orientation BCDI...
In this paper, to meet the requirements of low thermal budget for 3D integration on fan-out wafer or panel level processing even bigger substrates such as Gen3.5 above, thermal, mechanical, and dielectric properties were studied a temperature polyimide material function cure parameters at ~200°C under atmospheric sub-atmospheric process conditions. These results are compared conventional higher polyimide. Vacuum appears improve outgassing strength lower pressure; however, dissipation factor...
This paper reviews the low-temperature and low-pressure thermal polymerization of dielectric polyimides that are used for redistribution layers (RDLs). Specifically, this presentation illustrates significant impact cure process in reducing temperature (by 20° to 50°C) times as much 25%) while providing better imidization ratio, film stress, mechanical (elongation %, tensile strength, Young’s modulus), (Tg, Td5%, CTE), electrical (Dk, Df) properties different types polyimides. Among many we...
In this paper, an experimental methodology was developed to characterize reflow performance for next-generation micro-bumps using bump shapes distinguished by the ratio of height diameter. Existing technology deals with 50µm bumps; study analyzed a pitch 15µm and below, correlating process parameters.