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Precipitation Strengthening of a Mg-Al-Ca–Based AXJ530 Die-cast Alloy

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Abstract

Precipitation of the Al2Ca phase in the α-Mg phase of the Mg-Al-Ca–based AXJ530 die-cast alloy and the effect of precipitation hardening on the creep resistance were studied. Precipitation of the Al2Ca phase is suppressed in the die-casting process due to its high cooling rate, but precipitation was observed during subsequent isothermal heat treatments above 448 K. The precipitate has a disk-shaped morphology parallel to the basal plane of the α-Mg matrix phase and increases hardness by aging in the temperature range of 448 to 573 K. The creep resistance of the die-cast material at 448 K was improved by a factor of 1.5 ∼ 2, by a peak-age heat treatment at 523 K for 1 hour. Improvement in strength is limited by the low volume fraction of the precipitates; however, the precipitates are effective obstacles against dislocations gliding on nonbasal planes during creep deformation.

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Acknowledgments

This research was supported by NSF FRG Grant Nos. F015408 and DMR-0309468. The authors are grateful to C.J. Torbet and C. Henderson (University of Michigan) for their assistance.

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Author notes

  1. A. Suzuki (Metallurgist)

    Present address: GE Global Research, Niskayuna, NY, 12309, USA

Authors and Affiliations

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

    A. Suzuki (Metallurgist), N.D. Saddock (Graduate Student), J.R. TerBush (Graduate Student), J.W. Jones (Professor) & T.M. Pollock (Professor)

  2. Materials & Processes Laboratory, General Motors Research & Development Center, Warren, MI, 48090, USA

    B.R. Powell (GM Technical Fellow)

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  1. A. Suzuki
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  2. N.D. Saddock
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Correspondence to A. Suzuki.

Additional information

Manuscript submitted July 23, 2007.

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Suzuki, A., Saddock, N., TerBush, J. et al. Precipitation Strengthening of a Mg-Al-Ca–Based AXJ530 Die-cast Alloy. Metall Mater Trans A 39, 696–702 (2008). https://doi.org/10.1007/s11661-007-9455-4

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