Curvature of micropores in Al–Cu alloys: An X-ray tomography study

Felberbaum, M. and Rappaz, M. (2011) Curvature of micropores in Al–Cu alloys: An X-ray tomography study. Acta Materialia, 59 18: 6849-6860. doi:10.1016/j.actamat.2011.07.005


Author Felberbaum, M.
Rappaz, M.
Title Curvature of micropores in Al–Cu alloys: An X-ray tomography study
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2011-10
Sub-type Article (original research)
DOI 10.1016/j.actamat.2011.07.005
Volume 59
Issue 18
Start page 6849
End page 6860
Total pages 12
Place of publication Oxford, U.K.
Publisher Pergamon
Collection year 2012
Language eng
Formatted abstract
Micropores formed in Al–Cu alloys cast under controlled conditions have been analyzed using high-resolution X-ray tomography. The influence of inoculation conditions, copper content, cooling rate and initial hydrogen content on the morphology of pores has been investigated. Based on the three-dimensional reconstructed shape of the pores, the distribution of curvature was estimated. It is shown that the mean curvature of pores in either non-inoculated or inoculated Al–4.5 wt.%Cu alloys can be as large as 0.35 μm−1 near the end of solidification and can be fairly well approximated by a set of interconnected cylinders growing in between the primary phase dendrites. The so-called “pinching” effect, i.e. the restriction of the pore curvature by the solid network, is a function of the volume fraction of the primary phase and of the secondary dendrite arm spacing. If the fraction of porosity is highly dependent on the initial hydrogen content, the curvature itself is only weakly influenced by this parameter. Based on these results, it is concluded that curvature plays a major role in porosity models and that the analytical pinching model developed by Couturier et al. offers a fairly good and simple approximation of this contribution.
Keyword Microporosity
Curvature
X-ray tomography
Pinching model
Solidification
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Non HERDC
 
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Created: Fri, 21 Oct 2011, 13:13:41 EST by Viviane Victoria Crosthwaite on behalf of Faculty Of Engineering, Architecture & Info Tech