A. Quadling D. Bowden C. Hardie A. Vasanthakumaran
The STEP environment will include magnetic, thermal, mechanical and environmental loads far greater than those seen in the Joint European Torus campaigns of the past decade or currently contemplated for ITER. Greater still are the neutron peak dose rates of 10-6displacements per atom, per second, which in-vessel materials in STEP are …
PreprintB. Poole A. Marsh D. Lunt C. Hardie M. Gorley C. Hamelin A. Harte
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 high initial capital cost can be prohibitive for research organisations and groups. Conventional thermionic SEMs using either a tungsten hairpin or LaB
Preprint PublishedB. Poole A. Marsh D. Lunt C. Hardie M. Gorley C. Hamelin A. Harte
Scanning electron microscopy-based is now an established technique, providing full-field strain and displacement measurement at the microscale. Techniques for generating speckle patterns for sub-micron strain mapping are highly substrate dependent but typically rely on applying aggressive conditions which may alter the microstructure of interest…
PreprintRenato Pero Nicholas Randall Damian Frey Remo Widmer Tim Darby Lee Aucott Chris Hardie Sunil Pak Philippe Maquet Andrew Bushby
The International Thermonuclear Experimental Reactor (ITER) is an international nuclear fusion research and engineering project with the aim to prove the feasibility of nuclear fusion as a large-scale carbon-free source of energy. The reactor vessel contains several diagnostic windows that provide a line of sight to the plasma. Design and qualif…
PreprintChris Hardie Rhys Thomas Yang Liu Philipp Frankel Fionn Dunne
Classical crystal plasticity formulation based on dislocation slip was extended to include the mechanisms of dislocation channelling, with associated strain softening which is observed in many alloys post irradiation. The performance of the model was evaluated against experimental data on Zircaloy-4, which included engineering stress-strain respons…
Preprint PublishedA. J. Cackett H. T. Vo J. J. H. Lim A.J. Bushby P. Hosemann C.D. Hardie
The results of small-scale mechanical tests are convoluted by the so-called size effect, whereby materials appear stronger when the scale of the test is reduced to the order of microns or less. The dimensional range over which this occurs has been shown to be linked to a change in sample microstructure, such as the addition of defects induced by…
Preprint PublishedF. Schoofs S. King A. Cackett M. Leyland C. Hardie
Small Angle Neutron Scattering (SANS) is performed to analyse the microstructural state of reference CuCrZr material with carefully controlled heat treatments, small-scale manufacturing mock-ups of assemblies and high-heat-flux exposed mock-ups. The information derived from the SANS data corresponds well to existing literature data based on microsc…
Preprint PublishedF. Schoofs A. Cackett J. Lim S. M. King A. Schiavi T. R. Barrett C. Hardie
The divertor component is subject to some of the most extreme loading conditions in a fusion environment and the safety design window is relatively narrow. Variation in mechanical properties of the same material throughout a component is common place in practice and can be caused by both local effects of processing and joining, and local variations…
Preprint PublishedA.Kareer E. Tarleton C. Hardie S.V.Hainsworth A.J.Wilkinson
In this paper we investigate the residual deformation field in the vicinity of nano-scratch experiments generated using two tip geometries in a (100) Cu single crystal. We compare the deformation with that from indentation, in an attempt to understand the mechanisms of deformation in tangential sliding. The lattice rotation fields are mapped exp…
Preprint PublishedR.G. Abernethy J.S.K.-L. Gibson A. Giannattasio J.D. Murphy O. Wouters S. Bradnam L.W. Packer M.R. Gilbert M. Klimenkov M. Rieth H.-C. Schneider C.D. Hardie S.G. Roberts D.E.J. Armstrong
Only limited data exist on the effect of neutron irradiation on the brittle to ductile transition (BDT) in tungsten. This work investigates the increase in brittle to ductile transition temperature (BDTT) following neutron irradiation to 1.67 displacements per atom, using four-point bend tests over a range of temperatures (623 – 1173 K) and strai…
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