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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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|
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