Microstructure and mechanical behaviour of an elevated temperature Mg-rare earth based alloy

AM-SC1 is a heat treatable magnesium alloy that has been specifically developed to achieve the elevated temperature strength and creep properties necessary for engine block applications. This paper describes the interrelationship between the microstructure and the mechanical properties of AM-SC1. Th...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2009-04, Vol.505 (1), p.6-12
Main Authors: Bettles, C.J., Gibson, M.A., Zhu, S.M.
Format: Article
Language:English
Subjects:
Alloy design
Applied sciences
Creep
Creep resistance
Elasticity. Plasticity
Exact sciences and technology
Magnesium alloy
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Sand-cast
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Summary:AM-SC1 is a heat treatable magnesium alloy that has been specifically developed to achieve the elevated temperature strength and creep properties necessary for engine block applications. This paper describes the interrelationship between the microstructure and the mechanical properties of AM-SC1. The compressive and tensile strengths are relatively insensitive to temperature up to and including 450 K and the tensile yield behaviour deviates from a standard Hall-Petch relationship at grain sizes below 200 μm. The microstructural features contributing to the creep resistance are both inter- and intra-granular in nature and are on length scales from nanometers to micrometers. The creep behaviour at 423 K and 450 K is diffusion controlled, with any contribution from the grain boundaries being negligible.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2008.11.004