Journal
MATERIALS LETTERS
Volume 62, Issue 26, Pages 4207-4209Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2008.06.035
Keywords
hot working; magnesium alloys; processing map; dynamic recrystallization; kinetics
Funding
- City University of Hong Kong [7002013]
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The hot working characteristics of as-cast Mg-3Sn-1Ca alloy have been studied using processing-map technique and the kinetic rate equation. The map exhibited two domains; one in the lower strain rate range (0.0003-0.01 s(-1)) and the other in the higher strain rate range (0.1-10 s(-1))-both falling in the same temperature range of 350-550 s(-1). Hot extrusion at 500 degrees C and a speed corresponding to an average strain rate of 3 s(-1) exhibited dynamically reciystallized microstructure. The estimated apparent activation energy values are higher than those for self-dilfusion in pure magnesium suggesting that the large volume fraction of MgSnCa intermetallic particles causes significant back stress. (c) 2008 Elsevier B.V. All rights reserved.
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