M. E. Sayed J. O. Roberts K. Donaldson S. T. Mahon F. Iqbal B. Li S. F. Aixela G. Mastorakis E. T. Jonasson M. P. Nemitz S. Bernardini A. A. Stokes
Operations in extreme and hostile environments such as offshore oil and gas, nuclear decommissioning, nuclear facilities maintenance, deep mining, space exploration, and subsea applications require the execution of sophisticated tasks. In nuclear environments, robotic systems have advanced significantly over the past years but still suffer from ta…
Preprint PublishedViacheslav Kuksenko Artem Lunev Ed Darnbrough Chris Densham Patrick Hurh Steve Roberts
The effect of ion irradiation on evolution of microstructure and hardening of beryllium with different impurity levels was investigated using TEM and nanoindentation. High purity S-65 grade and less-pure S-200-F grade were implanted by helium ions at temperatures of 50°C and 200°C. 11 different energies were used, so as to create a quasi-homog…
Preprint PublishedN. Mantel D. Bowden S.S. Herashchenko M. Fursdon A. D. L. Hancock I.E. Garkusha J. Roberts V.A. Makhlai A. von Mueller T. R. Barrett J.-H. You
In the conceptual design of EU-DEMO, damage to plasma facing components under disruption events is planned to be mitigated by specific sacrificial limiter components. A new limiter concept has been proposed using lattice structures fabricated with tungsten powder by additive manufacturing techniques. The major potential benefits of using a latti…
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…
Preprint PublishedV. Kuksenko S. Roberts E. Tarleton
Four industrial beryllium grades were tested via nanoindentation. An extremely high variation of hardness was observed in all samples. Analysis of the nanoindentation data in combination with SEM/EBSD measurements demonstrated that the crystallographic orientation of the indented grain was the major source of the wide variation in hardness, which w…
Preprint PublishedY. Zayachuk D.E.J. Armstrong K. Bystrov S. Van Boxel T. Morgan S. G. Roberts
Tungsten samples were heat-treated to achieve partial recrystallization and exposed to high ion flux deuterium plasma at different temperatures and fluences. Continuous stiffness nanoindentation measurements of near-surface hardness were performed in the grains of specific annealing states and of specific crystallographic orientation, determined by…
Preprint Published