Paper Title:

Effects of Solidification Range on the Structure of Aluminium Alloys Obtained under Conditions of Constant Melt Flow

Periodical Materials Science Forum (Volumes 519 - 521)
Main Theme Aluminium Alloys 2006 - ICAA10
Edited by W.J. Poole, M.A. Wells and D.J. Lloyd
Pages 1789-1794
DOI 10.4028/www.scientific.net/MSF.519-521.1789
Citation A.N. Turchin et al., 2006, Materials Science Forum, 519-521, 1789
Online since July, 2006
Authors A.N. Turchin, Dmitry G. Eskin, Laurens Katgerman
Keywords Columnar Growth, Melt Flow, Solidification Range
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Effects of solidification range on macro- and microstructure of pure aluminium and binary Al–Cu alloys obtained under conditions of constant melt flow are studied experimentally. The solidification range of binary alloys was varied by changing the concentration of the alloying element. An electromagnetic pump with a specially designed melt-guiding system is used to organize controlled unidirectional melt flow along the solidification front. Temperature and melt flow velocity are controlled during the experiment. It is observed that the extent of solidification range changes the macro– and microstructure, affects width and deflection angle of columnar grains, and alters the dendrite arm spacing in the presence of melt flow. The melt flow itself is found to change the macro- and microstructure, e.g. the increase of melt flow velocity clearly decreases the dendrite arm spacing.

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