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Precipitation Effects in Ultra-Fine-Grained Mg–RE Alloys

Jakub Čížek, Ivan Procházka, Bohumil Smola, Ivana Stulíková, Martin Vlach, Vladivoj Očenášek, Olya B. Kulyasova and Rinat K. Islamgaliev

Abstract

Mg-based alloys with rare-earth alloying elements are promising hardenable lightweight materials with good mechanical properties even at elevated temperatures. Ductility and strength of these alloys can be improved by grain refinement. Ultra fine grained Mg alloys with grain size around 100 nm were successfully prepared by high-pressure torsion. Ultra-fine-grained structure can enhance diffusivity of alloying elements due to the significant volume fraction of grain boundaries. As a consequence, precipitation effects in ultra-fine-grained alloys may occur faster than in corresponding coarse-grained materials. This phenomenon was examined in this work by comparison of the precipitation sequence in Mg – Tb – Nd and Mg – Gd alloys with ultra-fine-grained structure and corresponding coarse-grained alloys.


* Correspondence address, Jakub Čížek Faculty of Mathematics and Physics, Charles University V Holešovičkách 2, CZ-180 00 Praha 8, Czech Republic Tel.: +420 221 912 788 Fax: +420 221 912 567 E-mail:

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Received: 2008-8-28
Accepted: 2009-4-2
Published Online: 2013-06-11
Published in Print: 2009-06-01

© 2009, Carl Hanser Verlag, München