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Licensed Unlicensed Requires Authentication Published by De Gruyter June 11, 2013

Phase composition and morphology development in WE-type alloys modified by high Zn content

Bohumil Smola, Ivana Stulíková, Nad'a Žaludová, František Hnilica, Vít Janík and Vladivoj Očenášek

Abstract

Quasicrystalline icosahedral equilibrium phase was found in Mg – Y – Nd (WE43) alloys with the addition of 12 wt.% and 25 wt.% Zn constituting grain boundary eutectic phases. In response to the isochronal annealing, morphologically similar precipitates of phases with the same structure as those developing during heat treatment of binary Mg-8 wt.% Zn alloy at temperatures higher than 150 °C were observed, namely β (b-centered monoclinic crystal structure a = 2.596 nm, b = 1.428 nm, c = 0.524 nm, = 102.5°) and β (hexagonal MgZn2). The evolution of the resistivity and microhardness during isochronal annealing corresponds to the phase transformations and the morphology changes of the phases observed. Dislocations with the c Burgers vector component generated due to the presence of icosahedral phase are responsible for the improved formability as compared to the WE43 alloy.


* Correspondence address, Assoc. Prof. Bohumil Smola, Faculty of Mathematics and Physics, Charles University Prague, Ke Karlovu 5, CZ 12116 Praha 2, Czech Republic, Tel.: +420 221 911 355, Fax: +420 221 911 618, E-mail:

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Received: 2008-8-25
Accepted: 2008-10-28
Published Online: 2013-06-11
Published in Print: 2009-03-01

© 2009, Carl Hanser Verlag, München