dc.contributor.author | Wenner, Sigurd | |
dc.contributor.author | Jones, Lewys | |
dc.contributor.author | Marioara, Calin Daniel | |
dc.contributor.author | Holmestad, Randi | |
dc.date.accessioned | 2018-01-05T13:41:48Z | |
dc.date.available | 2018-01-05T13:41:48Z | |
dc.date.created | 2017-03-27T13:43:03Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Micron. 2017, 96 103-111. | nb_NO |
dc.identifier.issn | 0968-4328 | |
dc.identifier.uri | http://hdl.handle.net/11250/2476051 | |
dc.description.abstract | Scanning transmission electron microscopy (STEM) coupled with energy-dispersive X-ray spectroscopy (EDS) is a common technique for chemical mapping in thin samples. Obtaining high-resolution elemental maps in the STEM is jointly dependent on stepping the sharply focused electron probe in a precise raster, on collecting a significant number of characteristic X-rays over time, and on avoiding damage to the sample. In this work, 80 kV aberration-corrected STEM-EDS mapping was performed on ordered precipitates in aluminium alloys. Probe and sample instability problems are handled by acquiring series of annular dark-field (ADF) images and simultaneous EDS volumes, which are aligned and non-rigidly registered after acquisition. The summed EDS volumes yield elemental maps of Al, Mg, Si, and Cu, with sufficient resolution and signal-to-noise ratio to determine the elemental species of each atomic column in a periodic structure, and in some cases the species of single atomic columns. Within the uncertainty of the technique, S and β” phases were found to have pure elemental atomic columns with compositions Al2CuMg and Al2Mg5Si4, respectively. The Q’ phase showed some variation in chemistry across a single precipitate, although the majority of unit cells had a composition Al6Mg6Si7.2Cu2. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | Elsevier | nb_NO |
dc.title | Atomic-resolution chemical mapping of ordered precipitates in Al alloys using energy-dispersive X-ray spectroscopy | nb_NO |
dc.type | Journal article | nb_NO |
dc.description.version | submittedVersion | nb_NO |
dc.source.pagenumber | 103-111 | nb_NO |
dc.source.volume | 96 | nb_NO |
dc.source.journal | Micron | nb_NO |
dc.identifier.doi | 10.1016/j.micron.2017.02.007 | |
dc.identifier.cristin | 1461404 | |
dc.relation.project | NORTEM: 197405 | nb_NO |
dc.relation.project | Norges forskningsråd: 221714 | nb_NO |
dc.description.localcode | This is a submitted manuscript of an article published by Elsevier Ltd in Micron, 28 February 2017. | nb_NO |
cristin.unitcode | 194,66,20,0 | |
cristin.unitname | Institutt for fysikk | |
cristin.ispublished | true | |
cristin.fulltext | preprint | |
cristin.qualitycode | 1 | |