Creep strength of magnesium-based alloys |
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Authors: | Maruyama Kouichi Suzuki Mayumi Sato Hiroyuki |
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Affiliation: | (1) Department of materials Science, Graduate School of Engineering, Tohoku University, 980-8579 Sendai, Japan;(2) Department of Intelligent Machines and System Engineering, Faculty of Science and Technology, Hirosaki University, 036-8561 Hirosaki, Japan |
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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.
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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