Influence of dendrite arrangement on coarsening during solidification of high-solute Al alloys

Authors: Ruvalcaba, D.¹; Eskin, D. G.²; Mathiesen, R. H.³; Arnberg, L.³; Katgerman, L.⁴

Source: International Journal of Cast Metals Research, Volume 22, Numbers 1-4, August 2009 , pp. 271-274(4)

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Abstract:

Coarsening of dendrite arms during continuous solidification is usually characterised by measuring the secondary dendrite arm spacing (SDAS). Images obtained in-situ from X-ray microscopy studies during solidification were used to study SDAS development. Local coarsening and growth kinetics were studied during the solidification of high-solute content aluminium alloys (i.e. Al–30 Cu and Al–20 Cu (wt-%)). Downward and upward solidification conditions were imposed on the sample alloys in order to study the effect of those on coarsening and growth kinetics. The dendritic arrangement, direction of growth and growth fluctuations influence solute-rich liquid distribution which in turn affects solute gradients changing undercooling and thus coarsening and growth kinetics.

Keywords: COARSENING; DIRECTIONAL SOLIDIFICATION; ALUMINIUM ALLOYS; SOLIDIFICATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/136404609X367957

Affiliations: 1: Materials Innovation Institute M2i, The Netherlands;, Email: d.ruvalcaba@m2i.nl 2: Materials Innovation Institute M2i, The Netherlands 3: Norwegian University of Science and Technology NTNU, Norway 4: Delft University of Technology, The Netherlands Mekelweg 2, 2628 CD, Delft, The Netherlands

Publication date: 2009-08-01

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