Structure and Properties of Mg-Al-Ca Alloy after Severe Plastic Deformation

Abstract:

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Severe plastic deformation of a Mg-Al-Ca alloy resulted in different types of grain structure. High pressure torsion (HPT) was shown to lead to the formation of a nanocrystalline structure with a grain size of 100-200 nm, while equal channel angular pressing (ECAP) produced ultrafine grained (UFG) or submicrocrystalline (SMC) structures, depending on the ECAP temperature. An UFG structure with a grain size of 2-5 -m was formed at 300°C, as distinct from a finer SMC structure with a grain size of 300-800 nm formed at a lower temperature (220°C). The possibility of increasing the strength of the alloy in the UFG condition by a factor of 1.5-2, combined with a reasonable level of ductility and enhanced functional properties was thus demonstrated. ECAP of annealed Mg-Al-Ca with the formation of UFG structure was shown to lead to increased yield strength (by a factor of 2) and enhanced tensile ductility (by a factor of 3).

Info:

Periodical:

Materials Science Forum (Volumes 584-586)

Edited by:

Yuri Estrin and Hans Jürgen Maier

Pages:

559-564

DOI:

10.4028/www.scientific.net/MSF.584-586.559

Citation:

S. V. Dobatkin et al., "Structure and Properties of Mg-Al-Ca Alloy after Severe Plastic Deformation", Materials Science Forum, Vols. 584-586, pp. 559-564, 2008

Online since:

June 2008

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Price:

$35.00

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