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Understanding the Evolution of the Microstructure in Melt-Conditioned Direct-Chill Cast Al Alloys

A. K., Prasada Rao (2014) Understanding the Evolution of the Microstructure in Melt-Conditioned Direct-Chill Cast Al Alloys. Materials and Manufacturing Processes, 29 (7). pp. 848-852. ISSN 1042-6914

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Abstract

Present work focuses on understanding the solidification mechanism responsible for the grain-refinement in melt-conditioned direct chill (MC-DC) cast Al-alloy. It has been found that the melt-conditioning performed by stirring the liquid above the solidification front using a rotor–stator type melt-conditioning device, results in substantial fragmentation of dendrites due to forced convection and thermo-solutal distribution across the billet sump. Results also indicate that an isothermal region is created in the MC-DC regime of the billet sump, which further enhances the nucleation and restricts growth of the α-Al phase. The forced convection together with the solute transport lead to catastrophic dendrite fragmentation.

Item Type: Article
Uncontrolled Keywords: Alloy; Aluminum; Billet, Casting; Dendrite; Fragmentation; Microstructure; Nucleation
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TN Mining engineering. Metallurgy
Q Science > QC Physics
Faculty/Division: Faculty of Manufacturing Engineering
Depositing User: Ass. Prof. Dr. Kameswari Prasada Rao Ayyagari
Date Deposited: 04 Aug 2014 01:48
Last Modified: 12 Mar 2018 02:24
URI: http://umpir.ump.edu.my/id/eprint/6249
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