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Restrictions of Physical Properties on Solidification Microstructures of Al-based Binary Alloys by Cellular Automaton
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2010 (English)In: ISIJ International, ISSN 0915-1559, Vol. 50, no 12, 1835-1842 p.Article in journal (Refereed) Published
Abstract [en]

The solidification microstructure evolution and the Columnar to Equiaxed Transition (CET) during Al-Si and Al-Cu binary alloy solidification processes are analyzed by the help of Cellular Automaton-Finite Difference (CA-FD) model The effects of the physical properties except the effects of the nucleation parameters and the operation parameters on the cooling curves the dendrite growth the solidification morphologies and the CET of the Al-Si and Al-Cu binary alloys are emphatically discussed Results show that the solidification morphologies are internally influenced by the physical properties related to the dendrite tip growth kinetics Besides the solute diffusivity in liquid D-L and the growth restriction parameter Q=mC(o)(k(S/L)-1) the Gibbs-Thomson coefficient Gamma shows a great effect on dendrite tip growth rate Their effects on the dendrite tip kinetics are ordered as m(k(S/L)-1)>Gamma>D-L The growth rate can be predicted efficiently by the present simplified expression based on GGAN model combining several physical parameters and the local under-cooling which clearly shows the physical meaning of the constant coefficients in the simplified expression based on KGT model The equiaxed ratio related to the solidification morphologies can also be evaluated as a function of those physical properties

Place, publisher, year, edition, pages
2010. Vol. 50, no 12, 1835-1842 p.
Keyword [en]
physical parameter, growth restriction, solidification, CET, equiaxed ratio, cellular automaton
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-30537ISI: 000285666400016ScopusID: 2-s2.0-79952054297OAI: diva2:401756
QC 20110303Available from: 2011-03-03 Created: 2011-02-28 Last updated: 2011-03-03Bibliographically approved

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Nakajima, Keiji
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