Abstract
The present article focuses on the high-temperature mechanical properties of the magnesium alloy AZ91. The addition of rare-earth (RE) elements up to 2 wt pct improves both yield and tensile strengths at 140 °C by replacing the Mg17Al12 phase with RE-containing intermetallic compounds. This intermetallic phase is thermally and metallurgically stable and is expected to boost the grain-boundary strengthening. It also increases the resistance of grain boundaries to flow at high temperatures. Further increases of RE additions reduce strength and ductility due to growth of the Al11RE3 brittle phase, which has sharp edges. Still, at a 3 wt pct RE addition, the strength of the alloy at high temperatures is more than that of AZ91.
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References
L.-Y. Wei: “The Fine Structure of Mg K-Edge in Die Cast Mg-Al-Base Alloys and the Precipitation in a Cast Mg-Rare Earth Alloy,” Final Report, AMTT, Austrian Research Centers, Seibersdorf, 2001.
G.V. Raynor: The Physical Metallurgy of Magnesium, and Its Alloys, Pergamon Press, Oxford, United Kingdom, 1959.
M.O. Pekguleryuz: Development of Creep Resistant Magnesium Diecasting Alloys—An Overview, Noranda Technology Center, Montreal, Quebec, Canada.
M.O. Pekguleryuz and J. Renaud: in 2000 Magnesium Technology, H. Kaplan, J. Hryn, and B. Clow, eds., TMS, Warrendale, PA, 2000, pp. 279–84.
M.S. Dargusch, G.L. Dunlop, and K. Pettersen: Proc. Conf. on Magnesium Alloys and Their Applications, Werkstoff-Informationsgesellschaft mbH, Wolsburg, Germany, 1998, pp. 77–82.
I.P. Moreno, T.K. Nandy, J.W. Jones, J.E. Allison, and T.M. Pollock: Scripta Mater., 2003, pp. 1029–34.
W.K. Miller: in Advances in Magnesium Alloys and Composites, H. Paris and W.H. Hunt, eds., TMS, Warrendale, PA, 1988, pp. 41–55.
B. Bronfin, E. Aghion, F. von Buch, S. Schuman, and H. Friedrich: Proc. Conf. on Magnesium Alloys and Their Application, K.U. Kainer, Wolfsburg, Germany, 2003, pp. 55–61.
P. Labelle, M. Pekgularyuz, D. Argo, and M. Lefebvre: Temperature Behaviour of AJ52X, Heat Resistant Magnesium Alloy for Power-Train Application, Noranda Technology Center, Montreal, Quebec, Canada.
W. Blum, Y.J. Li, X.H. Zeng, B. von Großmann, C. Haberling, and H.G. Haldenwanger: Proc. Conf. on Magnesium Alloys and Their Application, K.U. Kainer, Wolfsburg, Germany, 2003, pp. 62–67.
Y. Wang, Q. Wang, and C. Ma: Mater. Sci. Eng., 2003, vol. A342, pp. 178–82.
M.O. Pekguleryuz: Proc. Conf. on Magnesium Alloys and Their Application, K.U. Kainer, Wolfsburg, Germany, 2003, pp. 74–93.
S. Celotto and T.J. Bastow: Acta Mater., 2001, vol. 49, pp. 41–51.
Y. Lu and Q. Wang: Mater. Sci. Eng., 2000, vol. A278, pp. 66–76.
D. Wenwen, S. Yangshan, M. Xuegang, and X. Feng: Mater. Sci. Eng., 2003, pp. 1–7.
W. Qudong and L. Yizhen: Mater. Sci. Eng., 1999, vol. A271, pp. 109–15.
A.K. Dahle, Y.C. Lee, and M.D. Nave: J. Light Met., 2001, vol. 1, pp. 61–72.
C.H. Caceres and D.M. Rovera: J. Light Met., 2001, vol. 1, pp. 151–56.
Y. Guangyin, S. Yangshan, and D. Wenjiang: Mater. Sci. Eng., 2001, vol. A308, pp. 38–44.
H. Baker: ASM Handbook, vol. 3, Alloy Phase Diagram, ASM, Materials Park, OH, 1992.
J.B. Clark: Acta Metall., 1968, vol. 16, pp. 141–52.
Y.Z. Lu, Q.D. Wang, and W.J. Ding: Mater. Lett., 2000, vol. 44, pp. 265–68.
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Khomamizadeh, F., Nami, B. & Khoshkhooei, S. Effect of rare-earth element additions on high-temperature mechanical properties of AZ91 magnesium alloy. Metall Mater Trans A 36, 3489–3494 (2005). https://doi.org/10.1007/s11661-005-0022-6
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DOI: https://doi.org/10.1007/s11661-005-0022-6