Hot workability characteristics of cast and homogenized Mg–3Sn–1Ca alloy

Rao, K. P. ; Prasad, Y. V. R. K. ; Hort, N. ; Kainer, K. U. (2008) Hot workability characteristics of cast and homogenized Mg–3Sn–1Ca alloy Journal of Materials Processing Technology, 201 (1-3). pp. 359-363. ISSN 0924-0136

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09240...

Related URL: http://dx.doi.org/10.1016/j.jmatprotec.2007.11.148

Abstract

Hot working behavior of Mg–3Sn–1Ca alloy has been evaluated with a view to explore its potential as a wrought alloy. The temperature and strain rate dependence of steady state flow stress has been analyzed. The processing maps exhibited two domains both in the temperature range 350-550°C with one in the lower strain rate range (0.0003–0.01 s-1) and the other at higher strain rates (1–10 s-1). The apparent activation energies estimated in these two domains respectively are 217 kJ/mole and 154 kJ/mole. The activation area values obtained, after making a correction for the back-stress generated by the hard intermetallic CaMgSn particles, are in the range 13-100 b2 and decreased with increasing effective stress. The corrected results suggest that the lower strain rate domain is controlled by lattice self-diffusion and grain boundary diffusion occurs at higher strain rates. Extrusion at 500°C and at a speed that corresponds to an average strain rate of 3 s-1 yielded a sound product with a dynamically recrystallized microstructure.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Hot Working; Magnesium Alloy; Processing Map; Dynamic Recrystallization
ID Code:37888
Deposited On:30 Apr 2011 08:35
Last Modified:30 Apr 2011 08:35

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