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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:703

Article

Panagos, P.^1,2  Wang, Y.^1,2  McCartney, D. G.^2,3  Li, M.⁴  Ghaffari, B.⁴  Zindel, J. W.⁴  Miao, J.⁵  Makineni, S.⁵  Allison, J. E.⁵  Shebanova, O.⁶  Robson, J. D.¹  Lee, Peter D.^1,2 

[1] Univ Manchester, Sch Mat, Oxford Rd, Manchester M13 9PL, Lancs, England

[2] RAL, Res Complex Harwell, Didcot OX11 0FA, Oxon, England

[3] Univ Nottingham, Fac Engn, Adv Mat Grp, Univ Pk, Nottingham NG7 2RD, England

[4] Ford Motor Co, Res & Innovat Ctr, Mat Res Dept, MD3182,POB 2053, Dearborn, MI 48121 USA

[5] Univ Michigan, Dept Mat Sci & Engn, 2300 Hayward St, Ann Arbor, MI 48109 USA

[6] Diamond Light Source Ltd, Diamond House,Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England

关键词: SAXS;    Cast aluminium alloys;    Precipitation;    Quantitative analysis;    TEM;    Trialuminide;   

DOI  :  10.1016/j.jallcom.2017.01.293

来源: Elsevier

【 摘 要 】

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 Al3Zr chi V1-chi 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. (C) 2017 Elsevier B.V. All rights reserved.

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