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80 items found (0 items not approved), displaying 1 to 10.[First/Prev] 1, 2, 3, 4, 5, 6, 7, 8 [Next/Last]

Instruments / Technical Area	Publication Details	Published
I12-JEEP: Joint Engineering, Environmental and Processing I15-Extreme Conditions	Mechanical properties and deformation mechanisms of metastable β Ti-12Mo alloy fabricated by in-situ alloying-based additive manufacturing Ranxi Duan , Fuzeng Ren , Dingshan Liang , Dominik Daisenberger , Oxana Magdysyuk , Junhua Luan , Zengbao Jiao , Moataz M. Attallah , Biao Cai Additive Manufacturing 107 DOI: 10.1016/j.addma.2025.104819 Diamond Proposal Number(s): [21147, 19558] Show Abstract ▼ Abstract: The strength-ductility trade-off in additively manufactured (AM) β Ti alloys remains a significant challenge. In this study, we employed a cost-effective in-situ alloying laser powder bed fusion approach with optimized processing parameters to fabricate a nearly fully dense, chemically homogeneous β Ti-12Mo alloy. We then examined how solution-treatment duration influences the tensile behavior of the AM Ti-12Mo alloy. The optimally solution-treated alloys exhibited high tensile yield strength (725–741 MPa) and commendable ductility (22–36 %) along both the 0° and 90° orientations relative to the build direction. Focusing on the underlying deformation mechanisms perpendicular to the build direction, we report a uniform elongation of 17.9 % and a pronounced strain hardening rate (∼2300 MPa at 4 %), which we elucidate via in-situ high-energy synchrotron X-ray diffraction and microstructural characterization. The high yield strength is primarily attributed to the presence of Mo-lean embryonic athermal ω nanoparticles. During plastic deformation, both twinning and phase transformation contribute to the high strain hardening rate. At the early stage (strain < 1.9 %), deformation is dominated by {332}< 113 >β twinning, whereas at later stages, the deformation-induced α'' phase becomes significant. The volume fraction of α'' phase increases with strain, supporting the continuous hardening. Notably, irrational {112}< 751 >β, secondary {112}< 111 >β, and {130}< 310 >α'' nano-twins confine the primary structures to nanograins and sustain strain hardening. This study sheds light on designing high-performance β Ti-12Mo alloy via AM followed by heat treatment.	Jun 2025
B18-Core EXAFS I11-High Resolution Powder Diffraction I12-JEEP: Joint Engineering, Environmental and Processing	Stepwise reactions in the potassium and ammonia-intercalated iron selenide superconductor phase diagram followed by in situ powder diffraction Simon J. Cassidy , Daniel N. Woodruff , Stefan J. Sedlmaier , Jack N. Blandy , Christina Reinhard , Oxana V. Magdysyuk , Andrew L. Goodwin , Silvia Ramos , Simon J. Clarke Journal Of The American Chemical Society DOI: 10.1021/jacs.5c00356 Diamond Proposal Number(s): [9610, 12763, 9019, 32893, 11574] Open Access Show Abstract ▼ Abstract: Iron-based superconductors have attracted much attention for their high superconducting temperatures and high upper critical fields, which make them promising candidates for application as well as fundamentally important for our understanding of superconductivity. One feature of these superconductors is their ability to intercalate and deintercalate species from between their iron-containing layers, something not available in cuprate high-temperature superconductors or niobium-based conventional superconductors used in technologies. This provides an opportunity for switchable changes in the superconducting properties as a function of chemical conditions, but the resulting structures are often hard to characterize due to loss of crystallinity and sometimes the formation of multiphase products. Here, we explore both the synthesis and decomposition of potassium and ammonia-intercalated iron selenide superconductors through in situ powder X-ray diffraction. We report a complete phase diagram including two new solution-stable ammonia-rich phases and several metastable forms. We give accurate characterization of the reported ammonia-poor forms using a combination of neutron and X-ray powder diffraction, using an innovative supercell approach to describe the phase breadth within the samples. These results give rare insight into stepwise changes occurring in solids along multiple reaction pathways, which demonstrate the importance of in situ diffraction techniques.	May 2025
I12-JEEP: Joint Engineering, Environmental and Processing	Advanced battery cathode microstructure analysis through operando synchrotron X-ray tomography and super-resolution deep learning Mohammad Javad Shojaei , Abeiram Sivarajah , Tayeba Safdar , Oxana V. Magdysyuk , Chu Lun Alex Leung , Chun Huang Solid State Ionics 422 DOI: 10.1016/j.ssi.2025.116818 Diamond Proposal Number(s): [26767] Open Access Show Abstract ▼ Abstract: Lithium ion batteries are pivotal for clean energy storage and mitigating climate change. In this study, we employ operando synchrotron X-ray computed tomography to investigate the dynamic evolution of battery cathode microstructure. We focus on tracking changes in porosity and pore size distribution at the microscale and cathode thickness at the macroscale during the lithiation and delithiation processes within a commercially configured battery. Image quality was enhanced using both conventional image processing methods and a Super-Resolution Convolutional Neural Network (SRCNN) model. Our findings revealed a slight increase in the cathode solid volume fraction and specific surface area as the battery transitioned from its pristine state to fully lithiated, followed by a reduction during delithiation. This behavior was attributed to the expansion of the cathode material and phase transitions during lithiation, which split larger pores into smaller ones, as evidenced by the increase in surface area. Cathode thickness also exhibited expansion during lithiation and contraction during delithiation. These results offer valuable insights into the structural changes that contribute to battery aging, helping researchers better understand how these different parameters change over time. This understanding is crucial for designing more durable and sustainable batteries in the future, both in terms of specific design and material selection, to enhance resistance during charge and discharge cycles to improve performance and longevity.	Apr 2025
I12-JEEP: Joint Engineering, Environmental and Processing	Non-monotonic lattice expansion in zeolitic imidazolate frameworks during heating Wessel M. W. Winters , Rasmus S. K. Madsen , Oxana V. Magdysyuk , Yuanzheng Yue Chemical Communications 423 DOI: 10.1039/D4CC03841J Show Abstract ▼ Abstract: The effect of substituting linkers with two additional methyl groups for conventional benzimidazolate on the thermal expansion behaviour of ZIF-62 was investigated by high-energy in situ X-ray diffraction. Increased structural integrity was observed with the addition of methyl groups, and variable anisotropic thermal expansion was discovered in ZIF-62 and its derivative.	Oct 2024
I12-JEEP: Joint Engineering, Environmental and Processing	Tunable sub-terahertz resonance absorption in high-coercivity magnetodielectric ceramics Evgeny A. Gorbachev , Liudmila N. Alyabyeva , Artem V. Pronin , Alexandra S. Sultanovskaya , Ekaterina S. Kozlyakova , Oxana V. Magdysyuk , Ilya V. Roslyakov , Martin Dressel , Boris P. Gorshunov , Lev A. Trusov Materials Horizons 63 DOI: 10.1039/D4MH00389F Show Abstract ▼ Abstract: Recently, giant coercivities (20–42 kOe) and sub-terahertz natural ferromagnetic resonance (NFMR) at 100–300 GHz were observed for single-domain M-type hexaferrite particles with high aluminum substitution. Herein, we fabricated dense ceramics of Sr0.67Ca0.33Fe8Al4O19 and, for the first time, investigated their magnetostatic and magnetodynamic properties in the temperature range of 5–300 K. It was shown that dense ceramics maintain their high magnetic hardness (a coercivity of 10–20 kOe) and NFMR frequencies of 140–200 GHz durably in the entire temperature range. Magnetizing the initially non-magnetized ceramics leads to a considerable decrease in the resonance absorption and to almost complete vanishing of the resonance line at 5 kOe. At the same time, an efficient linear frequency tuning by the external magnetic field was observed for the remanent sample. These findings open new horizons for developing industrial terahertz electronics based on dielectric ferrimagnets.	Jun 2024
I12-JEEP: Joint Engineering, Environmental and Processing	The battery failure databank: Insights from an open-access database of thermal runaway behaviors of Li-ion cells and a resource for benchmarking risks Donal P. Finegan , Julia Billman , Jacob Darst , Peter Hughes , Jesus Trillo , Matt Sharp , Alex Benson , Martin Pham , Inez Kesuma , Mark Buckwell , Hamish T. Reid , Charlie Kirchner-Burles , Matilda Fransson , David Petrushenko , Thomas M. M. Heenan , Rhodri Jervis , Rhodri Owen , Drasti Patel , Ludovic Broche , Alexander Rack , Oxana Magdysyuk , Matt Keyser , William Walker , Paul Shearing , Eric Darcy Journal Of Power Sources 597 DOI: 10.1016/j.jpowsour.2024.234106 Diamond Proposal Number(s): [24112, 20903, 17641] Open Access Show Abstract ▼ Abstract: The thermal response of Li-ion cells can greatly vary for identical cell designs tested under identical conditions, the distribution of which is costly to fully characterize experimentally. The open-source Battery Failure Databank presented here contains robust, high-quality data from hundreds of abuse tests spanning numerous commercial cell designs and testing conditions. Data was gathered using a fractional thermal runaway calorimeter and contains the fractional breakdown of heat and mass that was ejected, as well as high-speed synchrotron radiography of the internal dynamic response of cells during thermal runaway. The distribution of thermal output, mass ejection, and internal response of commercial cells are compared for different abuse-test conditions, which when normalized on a per amp-hour basis show a strong positive correlation between heat output from cells, the fraction of mass ejected from the cells, their energy- and power-density. Ejected mass was shown to contain 10 × more heat per gram than non-ejected mass. The causes of ‘outlier’ thermal and ejection responses i.e., extreme cases, are elucidated by high-speed radiography which showed how occurrences such as vent clogging can create more hazardous conditions. High-speed radiography also demonstrated how the time-resolved interplay of thermal runaway propagation and mass ejection influences the total heat generated.	Mar 2024
I12-JEEP: Joint Engineering, Environmental and Processing	Revealing per-grain and neighbourhood stress interactions of a deforming ferritic steel via three-dimensional X-ray diffraction James A. D. Ball , Anna Kareer , Oxana V. Magdysyuk , Stefan Michalik , Thomas Connolley , David Collins Communications Materials 5 DOI: 10.1038/s43246-024-00466-8 Diamond Proposal Number(s): [26376] Open Access Show Abstract ▼ Abstract: The structural performance of polycrystalline alloys is strongly controlled by the characteristics of individual grains and their interactions, motivating this study to understand the dynamic micromechanical response within the microstructure. Here, a high ductility single-phase ferritic steel during uniaxial deformation is explored using three-dimensional X-ray diffraction. Grains well aligned for dislocation slip are shown to possess a wide intergranular stress range, controlled by per-grain dependent hardening activity. Contrariwise, grains orientated poorly for slip have a narrow stress range. A grain neighbourhood effect is observed of statistical significance: the Schmid factor of serial adjoining grains influences the stress state of a grain of interest, whereas parallel neighbours are less influential. This phenomenon is strongest at low plastic strains, with the effect diminishing as grains rotate during plasticity to eliminate any orientation dependent load shedding. The ability of the ferrite to eliminate such neighbourhood interactions is considered key to the high ductility possessed by these materials.	Mar 2024
I12-JEEP: Joint Engineering, Environmental and Processing	Investigation of ductile damage in dual phase steel during tensile deformation by in situ X-ray computed tomography Jiadong Chen , Oxana V. Magdysyuk , Xiao Li , Philip J. Withers , Kun Yan Engineering Fracture Mechanics 46 DOI: 10.1016/j.engfracmech.2023.109711 Diamond Proposal Number(s): [13234] Open Access Show Abstract ▼ Abstract: In situ synchrotron radiation X-ray computed tomography (CT) is used to understand the void nucleation and growth behaviour of dual phase (DP) steel, DP800, during uniaxial tensile deformation. The voids were identified post mortem as having nucleated primarily in the (41 vol%) martensite phase. The behaviour of individual voids was found to be broadly in line with a Rice and Tracey style growth model (their volume increasing by a factor of 10), while the mean void size was broadly in line with a model that included the continuous nucleation of new voids, as well as the growth of existing voids, throughout straining. Voids tended to elongate during uniaxial (low triaxiality) straining, but then to dilate more isotropically as necking led to increased triaxiality. One large pre-existing void was found to elongate quicky at first, but then for growth to slow, presumably because it was not located in the highest triaxial stress (necked) region. Perhaps surprisingly the average size of the void population grows only slowly (by a factor of 2) during straining; this is because while the size of each void grows, new small voids are always being nucleated. Finally, the changes of stress triaxiality and shear stress state during tensile deformation of the square cross-section smooth tensile specimen are investigated via finite element modelling, to qualitatively assess the impact of sample geometry on void nucleation behaviour and fracture strain in the current study.	Nov 2023
I12-JEEP: Joint Engineering, Environmental and Processing	Conditional generative adversarial networks for stripe artefact removal in high-resolution X-ray tomography Daniil Kazantsev , Lucas Beveridge , Vigneshwar Shanmugasundar , Oxana Magdysyuk Tomography Of Materials And Structures 1 DOI: 10.1016/j.tmater.2023.100019 Diamond Proposal Number(s): [33730] Open Access Show Abstract ▼ Abstract: Tomographic imaging supports a great number of medical and material science applications. The collected projection data usually has different types of imaging artefacts and noise. Various image pre-processing and reconstruction methods are used to obtain volumetric datasets of high quality for further analysis. In order to minimise reconstruction artefacts, one can apply either filtering and/or data completion/inpainting techniques which can recover the data. Deep learning (DL) methods to remove artefacts and noise have been successfully applied in the past. In this paper, we present a novel approach based on conditional generative adversarial networks (cGANs) to remove stripe artefacts. The novelty of the presented technique is in how the training data for DL is extracted from the same tomographic dataset that needs recovery. We also provide new deterministic stripe detection and inpainting algorithms to support the development. The presented methods are compared with other stripe removal algorithms and applied to 3D and 4D high-resolution X-ray data collected at Diamond Light Source synchrotron, UK. The proposed DL method delivers reconstructed images with minimised ring artefacts while being a parameter-free approach. A similar DL strategy can also be applied to remove other types of artefacts in images.	Nov 2023
I12-JEEP: Joint Engineering, Environmental and Processing	Amorphous solid dispersions of lidocaine and lidocaine HCl produced by ball milling with well-defined RAFT-synthesised methacrylic acid polymers Sara E. Bakhtiari , Zilan Zhu , Oxana V. Magdysyuk , Steve Brocchini , Gareth R. Williams International Journal Of Pharmaceutics 12 DOI: 10.1016/j.ijpharm.2023.123291 Diamond Proposal Number(s): [28460] Open Access Show Abstract ▼ Abstract: This study focuses on the use of methacrylic acid polymers synthesised via the Reversible Addition Fragmentation chain Transfer (RAFT) polymerisation method for the production of amorphous solid dispersions (ASDs) by ball milling, to kinetically solubilize a poorly water-soluble model drug. The solid-state characteristics and the physical stability of the formulations were investigated using X-ray diffraction, differential scanning calorimetry, and infrared spectroscopy. This was followed by dissolution studies in different media. It was discovered that the acidic polymers of methacrylic acid were capable of interacting with the weakly basic drug lidocaine and its hydrochloride salt form to produce ASDs when a polymer to drug ratio of 70:30 w/w was used. The ASDs remained amorphous following storage under accelerated aging conditions (40 °C and 75% relative humidity) over 8 months. Fast dissolution and increased lidocaine solubility in different media were obtained from the ASDs owing to the reduced microenvironment pH and enhanced solubilization of the drug caused by the presence of the acidic polymer in the formulation. Production of ASDs using well-defined RAFT-synthesised acidic polymers is a promising formulation strategy to enhance the pharmaceutical properties of basic poorly water-soluble drugs.	Aug 2023

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