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Effect of Sr Additions on the Microstructure and Strength of a Mg-Al-Ca Ternary Alloy

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Abstract

The effect of Sr additions on the microstructure and strength of a Mg-5Al-3Ca alloy was investigated by replacing Ca with Sr. In the as-cast alloys, the major intermetallic compound observed at the α-Mg dendrite cell boundary region changes from the Al-rich (Mg, Al)2Ca phase to the Mg-rich Mg17Sr2 phase with increasing Sr content. This results in an increased Al solute content in the α-Mg phase in the high-Sr containing alloys. More than 1 wt pct of Sr enhances the solid-solution strength of the α-Mg phase, resulting in the increased compression strength of the alloys.

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ACKNOWLEDGMENTS

This research was supported by NSF FRG Grant No. DMR-0309468 and the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Freedom Car and Vehicle Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT–Battelle, LLC, for the United States Department of Energy under Contact No. DE-AC05-000R22725. The authors are thankful to C.J. Torbet, C. Henderson (University of Michigan), Dr. B.R. Powell, N. Irish (General Motors), and Dr. P. Bakke (Norsk Hydro) for their assistance.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA

    A. SUZUKI (Research Fellow), N.D. SADDOCK (Graduate Student), J.W. JONES (Professors) & T.M. POLLOCK (Professors)

  2. Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    L. RIESTER (Senior Technical Advisor) & E. LARA-CURZIO (Distinguished Research Staff Member, Leader)

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  1. A. SUZUKI
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  2. N.D. SADDOCK
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  3. L. RIESTER
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  4. E. LARA-CURZIO
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  5. J.W. JONES
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  6. T.M. POLLOCK
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Correspondence to A. SUZUKI.

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Manuscript submitted June 12, 2006.

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SUZUKI, A., SADDOCK, N., RIESTER, L. et al. Effect of Sr Additions on the Microstructure and Strength of a Mg-Al-Ca Ternary Alloy. Metall Mater Trans A 38, 420–427 (2007). https://doi.org/10.1007/s11661-006-9031-3

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