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Improvement in the strength and ductility of Al-Mg-Mn alloys with Zr and Sc additions by equal channel angular pressing

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Published/Copyright: June 11, 2013

Abstract

The effect of equal channel angular pressing (ECAP) on the structure and mechanical properties of Al-4 % Mg-1.5 % Mn-0.4 % Zr and Al-4 % Mg-1.5 % Mn-0.4 % Zr-0.4 % Sc (wt.%) alloys in the initial as-cast and heat treated states was studied. The ECAP processing was shown to lead to the formation of a predominantly submicrocrystalline structure with an average grain size of 850 nm for initial as cast state and 860 nm for initial heat treated state in the Al–Mg–Mn–Zr–Sc alloy and 1060 nm for initial as cast state and 1240 nm for initial heat treated state in the Al–Mg–Mn–Zr alloy. It is remarkable that both strength and ductility of the two alloys in the initial conditions were enhanced by ECAP. The highest strength was observed in the Al–Mg–Mn–Zr–Sc alloy (UTS = 425 MPa), in combination with elongation to failure of EL = 17 %. The characteristics of strength and ductility after ECAP for the Al–Mg–Mn–Zr alloy as well as for the Al–Mg–Mn–Zr–Sc alloy were similar whether the initial state was as-cast or as-heat treated.


* Correspondence address Prof. Sergey Dobatkin A.A. Baikov Institute of Metallurgy and Materials Science Russian Academy of Sciences Leninsky pr. 49, 119991 Moscow, Russia Tel.: +7 4991 357 743 Fax: +7 4991 357 743 E-mail:

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Received: 2009-6-15
Accepted: 2009-10-23
Published Online: 2013-06-11
Published in Print: 2009-12-01

© 2009, Carl Hanser Verlag, München

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  20. Nanostructuring of Ti-alloys by SPD processing to achieve superior fatigue properties
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