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Processing map for hot working of as cast magnesium

Sivakesavam, O and Rao, IS and Prasad, YVRK (1993) Processing map for hot working of as cast magnesium. In: Materials Science and Technology, 9 (9). pp. 805-810.

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Official URL: http://www.ingentaconnect.com/content/maney/mst/19...

Abstract

The constitutive flow behaviour in hot working of as cast magnesium has been studied with the help of a processing map developed in the temperature range 300-550°C and strain rate range 0·001-100 s−1. The map, interpreted using the dynamic materials model, revealed that the material undergoes dynamic recrystallisation at 425°C and 0·3 s−1, which are the optimum parameters for hot working. Ai temperatures higher than 450°C and strain rates lower than about 0·1 s−1, wedge cracking occurs in as cast magnesium. The wedge cracking domain has a high efficiency of power dissipation (60%), whereas the dynamic recrystallisation domain has a value of 34%. At temperatures below 450°C and strain rates above 10 s−1, the material exhibits flow instability in the form of mechanical twinning. At higher temperatures and strain rates, instability is manifested by flow localisation.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Institute of Materials, Minerals and Mining.
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation and Applied Physics (Formally ISU)
Date Deposited: 23 Feb 2011 05:37
Last Modified: 23 Feb 2011 05:37
URI: http://eprints.iisc.ernet.in/id/eprint/35701

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