Hot workability characteristics of cast and homogenized Mg-3Sn-1Ca alloy
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In: Journal of Materials Processing Technology, Vol. 201, No. 1-3, 26.05.2008, p. 359-363.
Research output: Journal contributions › Journal articles › Research › peer-review
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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 -