Abstract
The hot deformation behavior of as-cast Mg-4Sn-2Ca (TX42) alloy has been studied using compression tests in the temperature range of 300°C to 500°C, and strain rate range of 0.0003 s−1 to 10 s−1. Based on the flow stress data, a processing map has been developed, which exhibited two domains of dynamic recrystallization in the temperature and strain rate ranges: (I) 300°C to 380°C and 0.0003 s−1 to 0.001 s−1, and (II) 400°C to 500°C and 0.004 s−1 to 6 s−1. While hot working may be conducted in either of these domains, the resulting grain sizes are finer in the first domain than in the second. The apparent activation energy values estimated by kinetic analysis of the temperature and strain rate dependence of flow stress in the domains 1 and 2 are 182 kJ/mol and 179 kJ/mol, respectively. Both the values are much higher than that for self-diffusion in pure magnesium, indicating that the thermally stable CaMgSn particles in the matrix cause significant back stress during the hot deformation of this alloy. The alloy exhibits a regime of flow instability at lower temperatures and higher strain rates, which manifested as flow localization.
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References
X.B. Chen, H.Y. Yang, T.B. Abbott, M.A. Easton, and N. Birbilis, JOM 64 (6), 650 (2012).
N.T. Kirkland, M.P. Staiger, D. Nisbet, C.H.J. Davies, and N. Birbilis, JOM 63 (6), 28 (2011).
T. Abu Leil, K.P. Rao, N. Hort, and K.U. Kainer, Magnesium Technology 2006, ed. A.A. Luo, N.R. Neelameggham, and R.S. Beals (Warrendale, PA: TMS, 2006), pp. 281–286.
G. Nayyeri and R. Mahmudi, Mater. Sci. Eng. A 527, 2087 (2010).
N. Hort, Y. Huang, T. Abu Leil, P. Maier, and K.U. Kainer, Adv. Eng. Mater. 8, 359 (2006).
F. Czerwinski, JOM 64 (12), 1477 (2012).
N. Hort, Y.D. Huang, T. Abu Leil, K.P. Rao, and K.U. Kainer, Kovove Mater. 49, 163 (2011).
T. Abu Leil, K.P. Rao, N. Hort, Y. Huang, C. Blawert, H. Dieringa, and K.U. Kainer, Magnesium Technology 2007, ed. R.S. Beals, A.A. Luo, N.R. Neelameggham, and M.O. Pekguleryuz (Warrendale, PA: TMS, 2007), pp. 257–262.
J.J. Jonas, C.M. Sellars, and W.J.McG. Tegart, Metall. Rev. 14, 1 (1969).
Y.V.R.K. Prasad and T. Seshacharyulu, Int. Mater. Rev. 43, 243 (1998).
Y.V.R.K. Prasad and S. Sasidhara, Hot Working Guide: A Compendium of Processing Maps (Materials Park, OH: ASM International, 1997).
Y.V.R.K. Prasad, J. Mater. Eng. Perform. 12, 638 (2003).
H. Ziegler, Progress in Solid Mechanics, ed. I.N. Sneddon and R. Hill (New York: Wiley, 1965), pp. 91–193.
Y.V.R.K. Prasad and K.P. Rao, Mater. Sci. Eng. A 391, 141 (2005).
A. Kozlov, M. Ohno, T. Abu Leil, N. Hort, K.U. Kainer, and R. Schmid-Fetzer, Intermetallics 16, 316 (2008).
S.E. Ion, F.J. Humperys, and S.H. White, Acta Metall. 30, 1909 (1982).
H.J. Frost and M.F. Ashby, Deformation-Mechanism Maps: The Plasticity and Creep of Metals and Ceramics (Oxford, UK: Pergamon Press, 1982), p. 44.
P.W. Flynn, J. Mote, and J.E. Dorn, Trans. Metall. Soc. AIME 221, 1148 (1961).
T. Obara, H. Yoshinaga, and S. Morozumi, Acta Metall. 21, 845 (1973).
J. Koike, T. Kobahashi, T. Mukai, H. Watanabe, M. Suzuki, K. Maruyama, and K. Higashi, Acta Mater. 51, 2055 (2003).
J.R. Morris, J. Scharff, K.M. Ho, D.E. Turner, Y.Y. Ye, and M.H. Yoo, Philos. Mag. A 76, 1065 (1997).
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The work presented in this article has been fully supported by a research grant (General Research Fund, Project #114809) from the Research Grants Council of the Hong Kong Special Administrative Region.
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Y. V. R. K. Prasad—formerly with City University of Hong Kong.
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Suresh, K., Rao, K.P., Prasad, Y.V.R.K. et al. A Study on the Hot Deformation Behavior of Cast Mg-4Sn-2Ca (TX42) Alloy. JOM 66, 322–328 (2014). https://doi.org/10.1007/s11837-013-0820-z
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DOI: https://doi.org/10.1007/s11837-013-0820-z