High temperature deformation mechanisms and processing map for hot working of cast-homogenized Mg-3Sn-2Ca alloy
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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THERMEC 2009. ed. / Tara Chandra; N. Wanderka; Walter Reimers; M. Ionescu. Trans Tech Publications Ltd, 2010. p. 3616-3621 (Materials Science Forum; Vol. 638-642).
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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TY - CHAP
T1 - High temperature deformation mechanisms and processing map for hot working of cast-homogenized Mg-3Sn-2Ca alloy
AU - Rao, K. P.
AU - Prasad, Y. V.R.K.
AU - Hort, N.
AU - Kainer, K. U.
N1 - Conference code: 6
PY - 2010
Y1 - 2010
N2 - The hot working behavior of Mg-3Sn-2Ca alloy has been investigated in the temperature range 300-500 °C and strain rate range 0.0003-10 s-1, with a view to evaluate the mechanisms and optimum parameters of hot working. For this purpose, a processing map has been developed on the basis of the flow stress data obtained from compression tests. The stress-strain curves exhibited steady state behavior at strain rates lower than 0.01 s-1 and at temperatures higher than 350 °C and flow softening occurred at higher strain rates. The processing map exhibited two dynamic recrystallization domains in the temperature and strain rate ranges: (1) 300-420 °C and 0.0003-0.003 s-1, and (2) 420-500 °C and 0.003-1.0 s-1, the latter one being useful for commercial hot working. Kinetic analysis yielded apparent activation energy values of 161 and 175 kJ/mole in domains (1) and (2) respectively. These values are higher than that for self-diffusion in magnesium suggesting that the large volume fraction of intermetallic particles CaMgSn present in the matrix generates considerable back stress. The processing map reveals a wide regime of flow instability which gets reduced with increase in temperature or decrease in strain rate.
AB - The hot working behavior of Mg-3Sn-2Ca alloy has been investigated in the temperature range 300-500 °C and strain rate range 0.0003-10 s-1, with a view to evaluate the mechanisms and optimum parameters of hot working. For this purpose, a processing map has been developed on the basis of the flow stress data obtained from compression tests. The stress-strain curves exhibited steady state behavior at strain rates lower than 0.01 s-1 and at temperatures higher than 350 °C and flow softening occurred at higher strain rates. The processing map exhibited two dynamic recrystallization domains in the temperature and strain rate ranges: (1) 300-420 °C and 0.0003-0.003 s-1, and (2) 420-500 °C and 0.003-1.0 s-1, the latter one being useful for commercial hot working. Kinetic analysis yielded apparent activation energy values of 161 and 175 kJ/mole in domains (1) and (2) respectively. These values are higher than that for self-diffusion in magnesium suggesting that the large volume fraction of intermetallic particles CaMgSn present in the matrix generates considerable back stress. The processing map reveals a wide regime of flow instability which gets reduced with increase in temperature or decrease in strain rate.
KW - Dynamic recrystallization
KW - Hot workability
KW - Kinetic analysis
KW - Mg-Sn-Ca alloy
KW - Processing map
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=75849118365&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.638-642.3616
DO - 10.4028/www.scientific.net/MSF.638-642.3616
M3 - Article in conference proceedings
AN - SCOPUS:75849118365
SN - 0878492941
SN - 9780878492947
T3 - Materials Science Forum
SP - 3616
EP - 3621
BT - THERMEC 2009
A2 - Chandra, Tara
A2 - Wanderka, N.
A2 - Reimers, Walter
A2 - Ionescu, M.
PB - Trans Tech Publications Ltd
T2 - 6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009
Y2 - 25 August 2009 through 29 August 2009
ER -