Browsing by Author "Baldwin, C"
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- ItemACNS sample environment update(Australian Nuclear Science and Technology Organisation, 2021-11-25) White, R; Davidson, G; D'Adam, TM; Booth, N; Baldwin, C; Shumack, ASince the last ANSTO User Meeting the sample environment group at ACNS has supported our facility users with a range of unique developments and set ups. We have had a change in structure with the laboratory group forming and working alongside us. We will report on the progress on our ongoing projects on Direct Laser Melting (DLM) deposition system co-funded by a NSW RAAP grant. Also underway are LIEF grants with equipment for use at ACNS, one includes a rheometer for use on ACNS beam instruments. This presentation will also cover our new equipment projects funded by the NCRIS RIIP scheme. This includes new cryofurnaces, a new type of furnace, a universal testing machine and other equipment. This funding will maintain and improve our existing capabilities and increase the redundancy across the SE suite to better service competing requests. © The Authors
- ItemCurrent high-pressure capabilities at ACNS and future plans(Australian Institute of Nuclear Science and Engineering (AINSE), 2020-11-11) Maynard-Casely, HE; Booth, N; Shumack, A; Baldwin, C; White, R; Rule, KC; McIntyre, GJ; Novelli, GHigh-pressure (>1 Kbar) is a marvellous variable, which can reveal mechanical properties, structural transitions and exotic behaviours. This pairs very well with neutron scattering, where the highly penetrating nature of neutron beams is idea for accessing sample within complex sample environments. The Australian Centre for Neutron Scattering (ACNS) has developed a number of capabilities for high-pressure experiments, mainly revolving around the use of our Paris-Edinburgh press but more recently with miniature diamond-anvil cells. Some of these, such as our ability to compress radioactive samples as well as combining high-pressure and high-electric fields are unique in the world. Here we review the high pressure capabilities at ACNS, and outline some directions for capabilities and measurements.
- ItemDevelopment of Direct Laser Melting (DLM) deposition system for in-situ use on neutron beam instruments(Australian Institute of Nuclear Science and Engineering (AINSE), 2020-11-11) Baldwin, C; White, R; Paradowska, AM; Booth, N; Davidson, G; D’Adam, TM; Shumack, A; Darmann, FDirect Laser Melting (DLM) deposition is an additive manufacturing technique in which a high power laser is used to create a melt pool on a workpiece while a jet of metal powder is applied, resulting in localised material deposition. This technique is used in industry for additive repairs, cladding with dissimilar metals, or, in conjunction with a CNC milling machine, as a full-fledged 3D additive fabrication platform. As the prominence of this technology rises, so too does interest in characterising deposition dynamics over a vast parameter space. Neutron beam instruments offer unique capabilities for such characterisation. As part of the NSW Research Attraction and Acceleration Program, ACNS is developing world first sample environment capabilities enabling in-situ laser metal deposition, for use on KOWARI and DINGO beamline. The system will utilise a self-contained motion stage and laser cladding head which will construct a thin wall structure on a user specified substrate, utilising up to two metal powders at a time. Neutron studies of the melt pool or heat affected zone can then be performed during and after printing. This paper will present the technical specifications and capabilities of the system, which will be available to the user community in late 2021. © The authors.
- ItemFew-layer hexagonal boron nitride / 3D printable polyurethane composite for neutron radiation shielding applications(Elsevier, 2023-03) Knott, JC; Khakbaz, HS; Allen, J; Wu, L; Mole, RA; Baldwin, C; Nelson, A; Sokolova, AV; Beirne, S; Innis, PC; Frost, DG; Cortie, DL; Rule, KCFunctional polymer composites can confer a range of benefits in practical applications that go beyond the individual properties of the constituent materials. Here we investigate and characterize the neutron absorbing capability of few-layer hexagonal boron nitride (h-BN) in composite with a 3D-printable thermoplastic polyurethane, and present experiment and simulation data to understand the processes and mechanisms in play. Shielding and protection from neutrons can be necessary in a range of terrestrial and space-based applications. The neutron absorption of composites with varying fractions of h-BN is strongly energy-dependent in the low-energy regime below 10 meV, and a composite containing 20 wt% h-BN shows a 70-fold reduction in the transmission relative to pure polyurethane at 0.5 meV neutron energies. This is attributed to the strong neutron capture cross-section of the naturally abundant boron-10 isotope, with energy-dependent measurements up to 100 meV confirming this point. Using inelastic neutron spectroscopy, we identify additional effects from the hydrogen in the polyurethane which both scatters diffusively and moderates neutrons inelastically via its phonon spectrum, enhancing the neutron absorption characteristics. Two models – based on analytic functions and Monte Carlo numerical techniques – are presented, and show excellent agreement with experiment results. The 3D-printability of the composite is demonstrated, and the opportunities and challenges for deploying these composites in neutron radiation protection applications are discussed. © 2022 Published by Elsevier Ltd.
- ItemOne layer at a time: unlocking novel materials and structures for neutron radiation environments through additive manufacturing(Australian Nuclear Science and Technology Organisation, 2021-11-26) Knott, J; Rule, KC; Cortie, DL; Innis, P; Baldwin, C; Beirne, S; Allen, JThe UOW-ANSTO Seed Funding program is an initiative aimed at encouraging new collaborations between researchers at the University of Wollongong and ANSTO - bringing together teams with diverse and complementary skillsets to tackle questions that require multi-disciplinary approaches. In 2019, a team of researchers from ANSTO’s Australian Centre for Neutron Scattering (ACNS), UOW’s Australian Institute for Innovative Materials (AIIM) and the Translational Research Initiative for Cell Engineering and Printing (TRICEP) came together to tackle the question “Can the structures and materials made possible by additive manufacturing enable novel solutions for neutron radiation environments?” To explore this question, we undertook activities in three themes: • THEME 1 – Polymers for neutron shielding and collimation • THEME 2 – Low-hydrogen polymers for neutron sample environments • THEME 3 – Metals and alloys for neutron sample environments This presentation will discuss activities undertaken in these themes, including: • THEME 1: investigating novel boron nitride/polyurethane materials developed by the UOW for use in neutron shielding and collimation applications via experiments on the Taipan, Pelican, Bilby and Platypus facilities at ANSTO; • THEME 2: the development of a custom low-hydrogen polymer (FEP) printing apparatus and optimised print procedure, to our knowledge one of the first such facilities. This has resulted in the production of low-hydrogen sample holders for use in ANSTO neutron environments; and • THEME 3: leveraging the world-class facilities and expertise in metal additive manufacturing at TRICEP to produce ‘sample can’ components in titanium and aluminium for validation and as a platform for future customised sample environment devices. This presentation will also discuss possibilities and future plans for work in this exciting area. © 2021 The Authors
- Item‘One layer at a time’: unlocking novel materials and structures for neutron radiation environments through additive manufacturing(Australian Institute of Nuclear Science and Engineering (AINSE), 2020-11-11) Allen, J; Baldwin, C; Khakbax, H; Beirne, S; Filippi, B; Innis, P; White, R; Wu, L; Cortie, DL; Rule, KC; Knott, JThe fact that neutrons can penetrate deeply makes them an excellent tool for probing the inner structures of materials, however this property also means that effective management of neutron radiation is a central challenge in nuclear engineering, neutron beam science and in the electronics industry. Neutrons also form a significant proportion of space radiation, and therefore novel, lightweight materials and structures for space radiation shielding are at the forefront of Australian and international space science development. Additive Manufacturing provides opportunities for creating novel structures with often complex geometries – and in materials not otherwise possible with traditional manufacturing techniques. We have brought together a team through the ANSTO-UOW Seed Funding Scheme to focus on the question: “Can the structures and materials made possible by additive manufacturing enable novel solutions for neutron radiation environments?” THEME 1 – Polymers for neutron shielding and collimation: particularly focusing on boron nitride/polymer composites and the possibilities these composites, coupled with 3D printing techniques, can open for neutron shielding and collimation applications – both terrestrial- and space-based THEME 2 – Low-hydrogen polymers for neutron sample environments: focusing on 3D-printable polymers for additive manufacturing low-background components for neutron sample environments THEME 3 – Metals and alloys for neutron sample environments: investigating additive manufacturing of metals – particularly aluminium – and alloys for neutron environment components. This presentation discusses the opportunities and some of the promising approaches for neutron environment additive manufacturing and novel composite materials – with specific examples and initial results from this collaborative endeavour.
- ItemStructural and phase evolution in U3Si2 during steam corrosion(Elsevier, 2022-08-01) Liu, J; Burr, PA; White, JT; Peterson, VK; Dayal, P; Baldwin, C; Wakeham, D; Gregg, DJ; Sooby, ES; Obbard, EGU3Si2 nuclear fuel is corroded in deuterated steam with in situ neutron diffraction. Density functional theory is coupled with rigorous thermodynamic description of the hydride including gas/solid entropy contributions. H absorbs in the 2b interstitial site of U3Si2Hx and moves to 8j for x ≥ 0.5. Hydriding forces lattice expansion and change in a/c ratio linked to site preference. Rietveld refinement tracks the corrosion reactions at 350–500 °C and preference for the 8j site. Above 375 °C, formation of UO2, U3Si5 and USi3 take place in the grain boundaries and bulk. Hydriding occurs in bulk and precedes other reactions. © 2022 Published by Elsevier Ltd.