Processing maps for hot working of a P/M iron aluminide alloy

Prasad, YVRK and Sastry, DH and Deevi, SC (2000) Processing maps for hot working of a P/M iron aluminide alloy. In: Intermetallics, 8 (9-11). pp. 1067-1074.

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Abstract

The hot working behavior of a Fe-24 wt.% Al iron aluminide alloy processed by the powder metallurgy route has been studied in the temperature range 750-1150°C and strain rate range $0.001-100 \hspace{2mm}s^{-1}$ by establishing processing maps at different strains in the range 0.1-0.5. The features in the processing maps have changed with strain suggesting that the mechanisms of hot deformation are evolving with strain. Early in the deformation (strain of 0.1), the map exhibited a single domain with a peak efficiency of power dissipation of about 44% occurring at about 1100°C and a strain rate of about $0.03 \hspace{2mm} s^{-1}$. This domain represents dynamic recrystallization (DRX) of the initial material possibly causing a substantial grain refinement. With increasing strain, a bifurcation has occurred giving rise to two domains: (1) at strain rates lower than about $0.1 \hspace{2mm}s^{-1}$ and temperatures above 1000°C, superplastic deformation has occurred, and (2) at strain rates higher than about $10 \hspace{2mm}s^{-1} $ and temperatures above 1125°C, DRX has occurred. The material exhibited flow localization at lower temperatures and higher strain rates. On the basis of the processing maps, the optimum processing routes available for hot working of this material are outlined.

Item Type:	Journal Article
Publication:	Intermetallics
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	A. Iron aluminides (based on FeAl);B. Deformation map;C. Plastic forming, hot;D. Microstructure
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	04 Jun 2007
Last Modified:	19 Sep 2010 04:36
URI:	http://eprints.iisc.ac.in/id/eprint/10407

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