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Quantification and characterisation of porosity in selectively laser melted Al–Si10–Mg using x-ray computed tomography

Maskery, Ian; Aboulkhair, N.T.; Corfield, M.R.; Tuck, Christopher; Clare, A.T.; Leach, Richard K.; Wildman, Ricky D.; Ashcroft, Ian; Hague, Richard J.M.

Quantification and characterisation of porosity in selectively laser melted Al–Si10–Mg using x-ray computed tomography Thumbnail


Authors

N.T. Aboulkhair

M.R. Corfield

CHRISTOPHER TUCK CHRISTOPHER.TUCK@NOTTINGHAM.AC.UK
Professor of Materials Engineering

ADAM CLARE adam.clare@nottingham.ac.uk
Professor of Manufacturing Engineering

Richard K. Leach

Ricky D. Wildman

IAN ASHCROFT IAN.ASHCROFT@NOTTINGHAM.AC.UK
Professor of Mechanics of Solids

Richard J.M. Hague



Abstract

We used X-ray computed tomography (CT), microscopy and hardness measurements to study Al–Si10–Mg produced by selective laser melting (SLM). Specimens were subject to a series of heat treatments including annealing and precipitation hardening. The specimen interiors were imaged with X-ray CT, allowing the non-destructive quantification and characterisation of pores, including their spatial distribution. The specimens had porosities less than 0.1%, but included some pores with effective cross-sectional diameters up to 260 μm. The largest pores were highly anisotropic, being flat and lying in the plane normal to the build direction. Annealing cycles caused significant coarsening of the microstructure and a reduction of the hardness from (114 ± 3) HV, in the as-built state, to (45 ± 1) HV, while precipitation hardening increased this to a final hardness of (59 ± 1) HV. The pore size and shape distributions were unaffected by the heat treatments. We demonstrate the applicability of CT measurements and quantitative defect analysis for the purposes of SLM process monitoring and refinement.

Journal Article Type Article
Publication Date Jan 1, 2016
Deposit Date Feb 25, 2016
Publicly Available Date Feb 25, 2016
Journal Materials Characterization
Print ISSN 1044-5803
Electronic ISSN 1873-4189
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 111
DOI https://doi.org/10.1016/j.matchar.2015.12.001
Keywords Selective laser melting; Aluminium alloy; Additive manufacture; X-ray computed tomography; Non-destructive testing
Public URL https://nottingham-repository.worktribe.com/output/979017
Publisher URL http://www.sciencedirect.com/science/article/pii/S1044580315300711

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