TY - JOUR

T1 - Hot workability characteristics of cast and homogenized Mg-3Sn-1Ca alloy

AU - Rao, K. P.

AU - Prasad, Y. V.R.K.

AU - Hort, N.

AU - Kainer, K. U.

PY - 2008/5/26

Y1 - 2008/5/26

N2 - 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.

AB - 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.

KW - Dynamic recrystallization

KW - Hot working

KW - Magnesium alloy

KW - Processing map

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=41549146727&partnerID=8YFLogxK

U2 - 10.1016/j.jmatprotec.2007.11.148

DO - 10.1016/j.jmatprotec.2007.11.148

M3 - Journal articles

AN - SCOPUS:41549146727

VL - 201

SP - 359

EP - 363

JO - Journal of Materials Processing Technology

JF - Journal of Materials Processing Technology

SN - 0924-0136

IS - 1-3

ER -