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

Strain-hardening behaviour of AZ31 magnesium alloys

Jaroslav Balík, Pavel Lukáč, Zdeněk Drozd and Radomír Kužel

Abstract

The in-plane tensile behaviour of rolled sheets of the magnesium alloy AZ31 was investigated in both an H24 state and an aged state. Whereas the very high initial strain-hardening rate decreases monotonically with strain for the H24 samples, the annealed structure exhibits a striking increase in the strain-hardening rate. To explain this phenomenon, the occurrence of sessile dislocations associated with a secondary (pyramidal) slip is proposed. The absence of increasing hardening for the H24 state is supposed to be related to higher yield stresses (predeformations) within the grains of the polycrystalline aggregate.


* Correspondence address, Dr. Jaroslav Balík, Faculty of Mathematics and Physics, Charles University, Departement of Physics of Materials, Ke Karlovu 5, 12116 Praha 2, Czech Republic, Tel.: +420 274 023 132, Fax: +420 222 729 256, E-mail:

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Received: 2008-8-27
Accepted: 2008-11-18
Published Online: 2013-06-11
Published in Print: 2009-03-01

© 2009, Carl Hanser Verlag, München