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

Panagos, P.; Wang, Y.; McCartney, D.G.; Li, M.; Ghaffari, B.; Zindel, J.W.; Miao, J.; Makineni, S.; Allison, J.E.; Shebanova, O.; Robson, J.D.; Lee, Peter D.

Authors

P. Panagos

Y. Wang

D.G. McCartney

M. Li

B. Ghaffari

J.W. Zindel

J. Miao

S. Makineni

J.E. Allison

O. Shebanova

J.D. Robson

Peter D. Lee



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 Xray 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 Al3ZrxV1-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.

Journal Article Type Article
Journal Journal of Alloys and Compounds
Print ISSN 0925-8388
Electronic ISSN 1873-4669
Publisher Elsevier
Peer Reviewed Peer Reviewed
APA6 Citation Panagos, P., Wang, Y., McCartney, D., Li, M., Ghaffari, B., Zindel, J., …Lee, P. D. (in press). Characterising precipitate evolution in multi-component cast aluminium alloys using small-angle X-ray scattering. Journal of Alloys and Compounds, doi:10.1016/j.jallcom.2017.01.293
DOI https://doi.org/10.1016/j.jallcom.2017.01.293
Keywords SAXS, cast aluminium alloys, precipitation, quantitative analysis, TEM, trialuminide
Publisher URL http://www.sciencedirect.com/science/article/pii/S092583881730347X
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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