Abstract
This article describes the creep and microstructure of Mg-Al-Ca-based magnesium alloys (designated as ACX alloys, where A stands for aluminum; C for calcium; and X for strontium or silicon) developed for automotive powertrain applications. Important creep parameters, i.e., secondary creep rate and creep strength, for the new alloys are reported. Creep properties of the new alloys are significantly better than those of the AE42 (Mg-4 pct* Al-2 pct RE**) alloy, which is the benchmark creep-resistant magnesium die-casting alloy. Creep mechanisms for different temperature/stress regimes are proposed. A ternary intermetallic phase, (Mg,Al)2Ca, was identified in the microstructure of the ACX alloys and is proposed to be responsible for the improved creep resistance of the alloys.
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A. Luo: in Magnesium Technology 2000, H.I. Kaplan, J.N. Hryn, and B.B. Clow, eds., TMS, Warrendale, PA, 2000, p. 89–98.
B.R. Powell, A. Luo, V. Rezhets, J.J. Bommarito, and B.L. Tiwari: SAE Technical Paper No. 2001-01-0422, SAE, Warrendale, PA, 2001.
A. Luo, M. Balogh, and B.R. Powell: SAE Technical Paper No. 2001-01-0423, SAE, Warrendale, PA, 2001.
G.E. Dieter: Mechanical Metallurgy, 3rd ed., McGraw-Hall Book Co., New York, NY, 1986, pp. 432–57.
L. Shi and D.O. Northwood: Acta Metall. Mater., 1994, vol. 42 (3), pp. 871–77.
W.K. Miller: Metall. Trans. A, 1991, vol. 22A, pp. 873–77.
T.Kr. Aune and T.J. Ruden: SAE Technical Paper No. 920070, SAE, Warrendale, PA, 1992.
M. Regev, E. Aghion, A. Rosen, and M. Bamberger: Mater. Sci. Eng. A, 1998, vol. A252, pp. 6–16.
M. Regev, E. Aghion, and A. Rosen: Mater. Sci. Eng. A, 1997, vols. A234–A236, pp. 123–26.
M.S. Dargusch, G.L. Dunlop, and K. Pettersen: Trans. 19th Int. Die Casting Congr., North American Die Casting Association, Rosemont, IL, 1997, pp. 131–37.
M.S. Dargusch and G.L. Dunlop: in Magnesium Alloys and Their Applications, B.L. Mordike and K.U. Kainer, eds., Werkstoff-Informationsgesellschaft, Frankfurt, Germany, 1998, pp. 277–82.
F.C. Chen, J.W. Jones, T.A. McGinn, J.E. Kearns, A.J. Nielsen, and J.E. Allison: SAE Technical Paper No. 970325, SAE, Warrendale, PA, 1997.
S.R. Agnew, K.C. Liu, E.A. Kenik, and S. Viswanathan: in Magnesium Technology 2000, H.I. Kaplan, J.N. Hryn, and B.B. Clow, eds., TMS, Warrendale, PA, 2000, pp. 285–90.
W.E. Mercer II: SAE Technical Paper No. 900788, SAE, Warrendale, PA, 1990.
M.O. Pekguleryuz and A. Luo: PCT (Patent Cooperative Treaty) Application WO 96/25529, filed on Feb. 14, 1996 and published on Aug. 22, 1996.
M.O. Pekguleryuz and J. Renaud: in Magnesium Technology 2000, H.I. Kaplan, J.N. Hryn, and B.B. Clow, eds., TMS, Warrendale, PA, 2000, pp. 279–84.
A. Luo and T. Shinoda: SAE Technical Paper No. 980086, SAE, Warrendale, PA, 1998.
A. Luo and T. Shinoda: in Magnesium Alloys and Their Applications, B.L. Mordike and K.U. Kainer, eds., Werkstoff-Informationsgesellschaft, Frankfurt, Germany, 1998, pp. 151–56.
A. Luo and T. Shinoda: U.S. Patent 5,855,697, Jan. 5, 1999.
K. Makino, T. Kawata, K. Kanemitsu, and K. Watanabe: U.K. Patent Application GB 2 296256A, filed on Dec. 22, 1994 and published on June 26, 1996.
J.J. Berkmortel, H. Hu, J.E. Kearns, and J.E. Allison: SAE Technical Paper No. 2000-01-1119, SAE, Warrendale, PA, 2000.
K.Y. Sohn, J.W. Jones, J.J. Berkmortel, H. Hu, and J.E. Allison: SAE Technical Paper No. 2000-01-1120, SAE, Warrendale, PA, 2000.
H. Uchida and T. Shinya: J. Jpn. Inst. Light Met., 1995, vol. 45 (10), p. 572.
T.B. Massalski: Binary Alloy Phase Diagram, ASM, Metals Park, OH, 1986, vol. 1, p. 619.
R.L. Mordike and P. Lukac: Proc. 3rd Int. Magnesium Conf., The Institute of Metals, London, 1997, pp. 419–29.
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All concentrations in wt. pct, unless otherwise stated.
RE stands for a combination of rare earth elements, i.e., misch metal, in this case.
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Luo, A.A., Powell, B.R. & Balogh, M.P. Creep and microstructure of magnesium-aluminum-calcium based alloys. Metall Mater Trans A 33, 567–574 (2002). https://doi.org/10.1007/s11661-002-0118-1
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DOI: https://doi.org/10.1007/s11661-002-0118-1