In situ and real-time 3-D microtomography investigation of dendritic solidification in an Al-10 wt.% Cu alloy

Limodin, N., Salvo, L., Boller, E., Suery, M., Felberbaum, M., Gailliegue, S. and Madi, K. (2009) In situ and real-time 3-D microtomography investigation of dendritic solidification in an Al-10 wt.% Cu alloy. Acta Materialia, 57 7: 2300-2310. doi:10.1016/j.actamat.2009.01.035


Author Limodin, N.
Salvo, L.
Boller, E.
Suery, M.
Felberbaum, M.
Gailliegue, S.
Madi, K.
Title In situ and real-time 3-D microtomography investigation of dendritic solidification in an Al-10 wt.% Cu alloy
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2009-04
Sub-type Article (original research)
DOI 10.1016/j.actamat.2009.01.035
Volume 57
Issue 7
Start page 2300
End page 2310
Total pages 11
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Abstract The microstructural evolution of an Al–10 wt.% Cu alloy was investigated during solidification at constant cooling rate by in situ synchrotron X-ray microtomography with a resolution of 2.8 μm. Solidification of this alloy leads to a coarse dendritic microstructure which was fully characterized in terms of variation with temperature of the solid fraction, the specific surface area of the solid–liquid interface and the local curvatures of the solid phase. By analysing the evolution with solid fraction of individual dendrites, at least two coarsening mechanisms were clearly identified in addition to solidification growth. The first mechanism involves remelting of small secondary dendrite arms to the benefit of bigger adjacent arms. The second is the coalescence of adjacent secondary arms, with progressive filling of the inter-arm spacing and coalescence at the tips. Although this mechanism preferentially occurs at high solid fractions, these results show that the evolution of the dendritic microstructure during solidification is complex and involves the occurrence of various mechanisms operating concurrently. In situ X-ray tomography thus allows revisiting the various models which have been proposed to account for dendrite coarsening during solidification.
Keyword Semi-solid
3-D X-ray tomography
Aluminium alloys
Dendritic solidification
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Faculty of Engineering, Architecture and Information Technology Publications
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Created: Fri, 21 Oct 2011, 13:18:27 EST by Viviane Victoria Crosthwaite on behalf of Faculty Of Engineering, Architecture & Info Tech