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Characterising precipitate evolution in multi-component cast aluminium alloys using small-angle X-ray scattering

Panagos, P; Wang, Y; McCartney, DG; Li, M; Ghaffari, B; Zindel, JW; Miao, J; ... Lee, PD; + view all (2017) Characterising precipitate evolution in multi-component cast aluminium alloys using small-angle X-ray scattering. Journal of Alloys and Compounds , 703 pp. 344-353. 10.1016/j.jallcom.2017.01.293. Green open access

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Abstract

Aluminium alloys can be strengthened significantly by nano-scale precipitates that restrict dislocation movement. In this study, the evolution of inhomogenously distributed trialuminide precipitates in two multi-component alloys was characterised by synchrotron small-angle X-ray scattering (SAXS). The appropriate selection of reference sample and data treatment required to successfully characterise a low volume fraction of precipitates in multi-component alloys via SAXS was investigated. The resulting SAXS study allowed the analysis of statistically significant numbers of precipitates (billions) as compared to electron microscopy (hundreds). Two cast aluminium alloys with different volume fractions of Al 3 Zr x V 1-x precipitates were studied. Data analysis was conducted using direct evaluation methods on SAXS spectra and the results compared with those from transmission electron microscopy (TEM). Precipitates were found to attain a spherical structure with homogeneous chemical composition. Precipitate evolution was quantified, including size, size distribution, volume fraction and number density. The results provide evidence that these multi-component alloys have a short nucleation stage, with coarsening dominating precipitate size. The coarsening rate constant was calculated and compared to similar precipitate behaviour.

Type: Article
Title: Characterising precipitate evolution in multi-component cast aluminium alloys using small-angle X-ray scattering
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jallcom.2017.01.293
Publisher version: https://doi.org/10.1016/j.jallcom.2017.01.293
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: SAXS, Cast aluminium alloys, Precipitation, Quantitative analysis, TEM, Trialuminide
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10049198
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