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Creep strength of magnesium-based alloys

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Abstract

The high-temperature creep resistance of magnesium alloys was discussed, with special reference to Mg-Al and Mg-Y alloys. Mg-Al solid-solution alloys are superior to Al-Mg solid-solution alloys in terms of creep resistance. This is attributed to the high internal stress typical of an hcp structure having only two independent basal slip systems. Although magnesium has a smaller shear modulus than aluminum, the inherent creep resistance of Mg alloys is better than that of Al alloys. The creep resistance of Mg alloys is improved substantially by the addition of Y. Solid-solution hardening is the principal mechanism of the strengthening, but the details of the mechanism have not been elucidated yet. Forest dislocation hardening in concentrated alloys and dynamic precipitation in a Mg-2.4 pct Y alloy also contribute to the strengthening. An addition of a very small amount of Zn raises the dislocation density and significantly improves the creep resistance of Mg-Y alloys.

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Authors and Affiliations

  1. the Department of Materials Science, Graduate School of Engineering, Tohoku University, 980-8579, Sendai, Japan

    Kouichi Maruyama (Professor) & Mayumi Suzuki (Assistant Professor)

  2. the Department of Intelligent Machines and System Engineering, Faculty of Science and Technology, Hirosaki University, 036-8561, Hirosaki, Japan

    Hiroyuki Sato (Associate Professor)

Authors
  1. Kouichi Maruyama
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  2. Mayumi Suzuki
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  3. Hiroyuki Sato
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Additional information

This article is based on a presentation made in the symposium entitled “Defect Properties and Mechanical Behavior of HCP Metals and Alloys” at the TMS Annual Meeting, February 11–15, 2001, in New Orleans, Louisiana, under the auspices of the following ASM committees: Materials Science Critical Technology Sector, Structural Materials Division, Electronic, Magnetic & Photonic Materials Division, Chemistry & Physics of Materials Committee, Joint Nuclear Materials Committee, and Titanium Committee.

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Maruyama, K., Suzuki, M. & Sato, H. Creep strength of magnesium-based alloys. Metall Mater Trans A 33, 875–882 (2002). https://doi.org/10.1007/s11661-002-0157-7

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