ORCID Profile
0000-0002-5998-4548
Current Organisation
University of Oxford
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Elsevier BV
Date: 02-2017
Publisher: Oxford University Press (OUP)
Date: 19-10-2023
Publisher: Oxford University Press (OUP)
Date: 04-2017
DOI: 10.1017/S1431927617000356
Abstract: The local electrode atom probe (LEAP) has become the primary instrument used for atom probe tomography measurements. Recent advances in detector and laser design, together with updated hit detection algorithms, have been incorporated into the latest LEAP 5000 instrument, but the implications of these changes on measurements, particularly the size and chemistry of small clusters and elemental segregations, have not been explored. In this study, we compare data sets from a variety of materials with small-scale chemical heterogeneity using both a LEAP 3000 instrument with 37% detector efficiency and a 532-nm green laser and a new LEAP 5000 instrument with a manufacturer estimated increase to 52% detector efficiency, and a 355-nm ultraviolet laser. In general, it was found that the number of atoms within small clusters or surface segregation increased in the LEAP 5000, as would be expected by the reported increase in detector efficiency from the LEAP 3000 architecture, but subtle differences in chemistry were observed which are attributed to changes in the way multiple hit detection is calculated using the LEAP 5000.
Publisher: Elsevier BV
Date: 02-2023
Publisher: Author(s)
Date: 2018
DOI: 10.1063/1.5049338
Publisher: Springer Science and Business Media LLC
Date: 18-01-2019
DOI: 10.1007/S11661-018-5098-X
Abstract: The formation and evolution of nanoscale γ ″ (Ni 3 (Nb, Ti, Al)) precipitates formed during thermal aging in the nickel superalloy Inconel 625 has been characterized using Atom Probe Tomography. The onset of γ ″ precipitation has been found to occur after only one hour, markedly shorter than the aging time reported in the current literature. Evolution of precipitate composition and morphology during aging has been analyzed, and the potential onset of the γ ″ → δ (Ni 3 (Nb, Mo, Cr, Fe, Ti)) transformation after long aging times is discussed.
Publisher: IOP Publishing
Date: 21-07-2016
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for James Douglas.