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Elevated temperature Mg-Al-Sr: Creep resistance, mechanical properties, and microstructure

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  • High-Temperature Magnesium
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Abstract

Mg-Al-Sr-based alloys (AJ alloys) have shown superior creep performance and tensile strength at temperatures as high as 175° with stresses up to 70 MPa. Mg-6Al-2.4Sr (AJ62x) exhibits an optimum combination of creep resistance and excellent castability, while AJ62Lx (strontium <2.1) has better ductility than other AJ formulations. The AJ alloy microstructure is characterized by the Al4Sr-α(Mg) lamellar phase that forms at the interdendritic/grain boundary region of the primary magne sium matrix. Mg-5Al-2Sr (AJ52x) contains a ternary phase that was tentatively named Al3Mg13Sr. When the strontium level is low in AJ62x, the volume fraction of Al4Sr is reduced, the aluminum supersaturation of the magnesium primary phase increases, and Mg17Al12 forms. In this article, a mechanism is proposed whereby the creep resistance decreases with the strontium level but the tensile strength and ductility increase.

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Authors and Affiliations

  1. Noranda, Montréal, Canada

    Eric Baril (a senior scientist) & Pierre Labelle (a senior engineer)

  2. McGill University, Montréal, Canada

    Mihriban Pekguleryuz (an Adjunct Professor)

Authors
  1. Eric Baril
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  2. Pierre Labelle
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  3. Mihriban Pekguleryuz
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Additional information

For more information, contact Eric Baril, Noranda, Noranda Technologies Centre, 240 Hymus Pointe-Claire (Montréal), Québec, H9R 1G5 Canada; (514) 630-9347; fax (514) 630-9379; e-mail eric.baril@ntc.noranda.com.

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Baril, E., Labelle, P. & Pekguleryuz, M. Elevated temperature Mg-Al-Sr: Creep resistance, mechanical properties, and microstructure. JOM 55, 34–39 (2003). https://doi.org/10.1007/s11837-003-0207-7

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  • DOI: https://doi.org/10.1007/s11837-003-0207-7

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