Prasad, YVRK and Sastry, DH and Deevi, SC (2001) Hot working behavior of extruded powder products of B2 iron aluminide alloys. In: Materials Science and Engineering A, 311 (1-2). pp. 42-53.
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Abstract
The characteristics of hot deformation of hot extruded B2 type iron aluminide alloy powders produced by gas-atomization and water-atomization techniques have been studied using compression tests in the temperature range 850–1150°C and true strain rate range 0.001–100$_{s-^1}$. At strain rates higher than about 1 $_{s-^1}$, the materials exhibited flow softening type of stress–strain curves, while at lower strain rates, the flow curves were of steady-state type. The apparent activation energy for hot deformation has been evaluated and is in the range 430–465 kJ $mole^-1$ both in the gas-atomized and water-atomized materials. The processing map for the gas-atomized material revealed that dynamic recrystallization occurs in wide ranges of temperature and strain rate with its optimum at 1075°C and 0.1 $_{s-^1}$. However, in the case of water-atomized material, the features in the processing map have changed with strain. The gas-atomized material is prone to flow instabilities like flow localization at strain rates higher than 10 $_{s-^1}$, while the water-atomized material exhibits stable flow even at high strains and high strain rates.
Item Type: | Journal Article |
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Publication: | Materials Science and Engineering A |
Publisher: | Elsevier |
Additional Information: | Copyright of this article belongs to Elsevier. |
Keywords: | Iron aluminide;Hot working;Processing maps;Dynamic recrystallization;Superplasticity;Flow localization |
Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
Date Deposited: | 06 Jun 2006 |
Last Modified: | 19 Sep 2010 04:29 |
URI: | http://eprints.iisc.ac.in/id/eprint/7529 |
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