Abstract
Solidification behavior and as-cast microstructure have been analyzed in a series of ternary Mg alloys consisting of Mg — Al — X: (Ca, Sr, Ce, La). Thermodynamic calculations of the Mg — Al — Ca, Mg — Al -Sr, and Mg — Al — Ce ternaries were conducted to predict the solidification path of the Mg — 4 Al — 4 X and Mg — 4 Al — 2 X systems. Thermal analyses of the solidification process and accompanying electron microscopy studies of as-cast microstructure were conducted on the same alloys. Scheil calculations and the experimental measurements of liquidus and solidus temperatures are compared. All microstructures consisted of primary α-Mg grains with intermetallic phases along the grain boundaries. Additions of Ca and Sr widen the solidus to liquidus gap to a much greater degree than equivalent levels of Ce and La.
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References
[B.R. Powell, V. Rezhets, A.A. Luo, B.L. Tiwari, Low-Cost, Creep-Resistant Magnesium Alloy for Powertrain Components, US Patent No. 6,264,764. July 24, 2001.
] B.R. Powell, A.A. Luo, V. Rezhets, J.J. Bommarito, B.L. Tiwari, Development of Creep-Resistant Magnesium Alloys for Powertrain Applications: Part 1 of 2, SAE Tech. Paper 2001-01-0422, March 6, 2001.
A.A. Luo, M.P. Balogh, B.R. Powell, Tensile Creep and Micro structure of Magnesium-Aluminum-Calcium-Based Alloys for Powertrain Applications: Part 2 of 2, SAE Tech. Paper, 2001-01-0423, March 6, 2001.
A.A. Luo, M.P. Balogh, B.R. Powell, Creep and Microstructure of Magnesium-Aluminum-Calcium Based Alloys, Met. Mat. Trans. A., 2002, pp 567–574.
E. Baril, P. Labelle, A. Fischersworring-Bunk, AJ(Mg-Al-Sr) Alloy System Used for New Engine Block, SAE Tech. Paper, 2004-01-0659, March 8, 2004.
B. Brofin, E. Aghion, S. Schumann, P. Bohling, K. U. Kainer, Magnesium Alloy for High Temperature Applications, US Patent No. 6,139,651, October 31, 2000.
I. A. Anyanwu, Y. Gokan, A. Suzuki, S. Kamado, Y. Kojima, S. Takeda, T. Ishida, Effect of substituting ceriumrich mischmetal with lanthanum on high temperature properties of die- cast Mg-Zn-Ca-RE alloys, Mat. Sci. Eng. A 380, 2004, pp 93–99.
[8] P. Bakke, H. Westengen, S. Sannes, D. Albright, Powertrain Components — Opportunities for the Die Cast AE Family of Alloys, SAE Tech. Paper, 2004-01-0655, March 8–11, 2004.
J. Berkmortel, H. Hu, J. E. Kearns, J.E. Allison, Die Castability Assessment of Magnesium Alloys for High Temperature Applications: Part 1 of 2, SAE Tech. Paper, 2000-01-1119, March 6–9, 2000.
[10] Y. W. Riddle, L. P. Barber, M. M. Makhlouf, Characterization of Mg Solidification and As-Cast Microstructures, Mag. Tech. Conf. Proceedings, March, 14–18 2004, pp 203–208.
J. Groebner, D. Kevorkov, I. Chumak, R. Schmid-Fetzer, Experimental investigation and thermodynamic calculation of ternary Al-Ca-Mg phase equilibria, Z. Metallk., 94, 2003, pp 976–982.
J. Grobner, D. Kevorkov, R. Schmid-Fetzer, Thermodynamic modeling of Al-Ce-Mg phase equilibria coupled with key experiments, Intermetallics., 10. 2002. pp 415–422.
[13] E. Scheil, Z. Metallk., 34, 1941, pp.70–72.
[14] Pandat-phase diagram calculation engine for multicomponent systems. CompuTherm LLC, 437 S. Yellowstone Dr., Suite 217, Madison, Wisconsin, USA(2000).
S-L. Chen, S. Daniels, F. Zhang, Y.A. Chang, W.A. Oates, R. Schmid-Fetzer, On the calculation of multicomponent stable phase diagrams, J. Phase Equilibria, 22.2001. pp. 373–378.
S. R. Agnew, O. Duygulu, TEM Investigation of Dislocation Mechanisms in Mg Alloy AZ31B Sheet, Mag Tech. Conf. Proceedings, March 14–18 2004, pp 61–65
G. Chadha, J.E. Allison, J. W. Jones, The Role of Microstructure and Porosity in Ductility of Die Cast AM50 and AM60 Magnesium Alloys, Mag. Tech. Conf. Proceedings, March 14–18, 2004, pp 181–186.
[18] C. Brubaker, Z.K. Liu, Diffusion Couple Study of the Mg-Al System, Mag. Tech. Conf. Proceedings, March 14–18, 2004, pp 229–234.
Y. W. Riddle, M.M. Makhlouf, Characterizing Solidification by Non-Equilibrium Thermal Analysis, Mag Tech. Conf. Proceedings, March 2–6, 2003, pp 101–106.
A. Suzuki, N.D. Saddock, J.W. Jones, T.M. Pollock, Structure and transition of eutectic (Mg,Al) 2 Ca Laves phase in a die-cast Mg-Al-Ca base alloy, Scripta Mater., 51, 2004, in press pp 1005–1010.
P. Chartrand, A.D. Pelton, Critical Evaluation and Optimization of the Thermodynamic Properties and Phase Diagrams of the Al-Mg, Al-Sr, Mg-Sr, and Al-Mg-Sr Systems, Journal of Phase Equilibria., 15. 1994. pp 591–605.
M.O. Pekgulervuz, E. Baril, Creep Resistant Magnesium Diecasting Alloys Based on Alkaline Earth Elements, Mat. Trans., 42, 2001, pp 1258–1267.
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Saddock, N.D. et al. (2016). Solidification and Microstructure of Mg — Al — (Ca, Sr, Ce, La) Ternary Alloys. In: Mathaudhu, S.N., Luo, A.A., Neelameggham, N.R., Nyberg, E.A., Sillekens, W.H. (eds) Essential Readings in Magnesium Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-48099-2_33
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