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Disorder trapping and grain refinement during solidification of undercooled Fe–18 at% Ge melts

Biswas, K and Phanikumar, G and Holland, Moritz D and Herlach, Dieter M and Chattopadhyay, K (2007) Disorder trapping and grain refinement during solidification of undercooled Fe–18 at% Ge melts. In: Philosophical Magazine, 87 (25). pp. 3817-3837.

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Abstract

The electromagnetic levitation technique has been used to systematically study microstructure evolution and growth rate as a function of undercooling in concentrated Fe–18 at% Ge alloy. The samples are undercooled to a maximum of 240 K. Growth-rate analysis and transmission electron microscopy reveal that, beyond an undercooling of 120 K, the primary phase to solidify is disordered. Microstructural investigations show a decrease in grain size with increasing undercooling. Orientation-imaging microscopy using electron back-scattered diffraction (EBSD and microhardness measurements have been used to show that recovery and recrystallization play a significant role in the evolution of final microstructure. Microstructural evolution has also been discussed in light of current models of dendrite growth and grain refinement.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Taylor & Francis Group.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 09 Jun 2008
Last Modified: 19 Sep 2010 04:45
URI: http://eprints.iisc.ernet.in/id/eprint/14232

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