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The Dependence of Creep Behavior on Elemental Partitioning in Mg-5Al-3Ca-xSn Alloys

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Cast Mg-5Al-3Ca-xSn alloys have been examined to investigate the effect of Sn additions on elemental partitioning during solidification, microstructure development, and compressive creep behavior at 453 K (180 °C). Alloys containing 0.25 to 3.0 wt pct Sn were cast with a permanent mold technique. The addition of 0.75 to 1.0 wt pct Sn had a beneficial effect on Ca partitioning to the α-Mg phase. Additions beyond 1 wt pct Sn resulted in the formation of an orthorhombic Mg-Ca-Sn phase, with decreased Ca partitioning to the α-Mg. A lower minimum creep rate was observed for the Mg-5Al-3Ca-xSn alloy with increased Ca partitioning. Consistent with this finding, analyses that consider the influence of solute and precipitation strengthening on creep in Mg-5Al-3Ca-xSn alloys suggest that Ca in the α-Mg contributes to a greater degree than Al in solution to the creep resistance at 453 K (180 °C).

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Acknowledgments

The authors acknowledge the support of the National Science Foundation FRG, grants F015408 and DMR-0309468. We also thank J. Zhu, R. Adharapurapu, C. Torbet, and C. Henderson (University of Michigan) for their assistance and B.R. Powell (General Motors) for his many helpful discussions.

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Correspondence to Jessica R. TerBush.

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Manuscript submitted July 14, 2011.

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TerBush, J.R., Chen, O.H., Jones, J.W. et al. The Dependence of Creep Behavior on Elemental Partitioning in Mg-5Al-3Ca-xSn Alloys. Metall Mater Trans A 43, 3120–3134 (2012). https://doi.org/10.1007/s11661-012-1158-9

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