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Advances in Materials Science and Engineering
Volume 2016, Article ID 9560413, 10 pages
http://dx.doi.org/10.1155/2016/9560413
Research Article

The Effect of Short Duration Electric Current on the Quasi-Static Tensile Behavior of Magnesium AZ31 Alloy

1School of Mechanical Engineering, University of Ulsan, Nam-gu, Ulsan 680-749, Republic of Korea
2Department of Materials Science & Engineering and Center for Iron & Steel Research, RIAM, Seoul National University, Gwanak-gu, Seoul 151-742, Republic of Korea
3Laboratory of Contact and Structure Mechanics, INSA-Lyon, 20, Avenue Albert Einstein, 69621 Villeurbanne, France

Received 24 February 2016; Accepted 17 May 2016

Academic Editor: Pavel Lejcek

Copyright © 2016 Trung Thien Nguyen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of a single pulse of electric current with short duration on the quasi-static tensile behavior of a magnesium AZ31 alloy is experimentally investigated. A single pulse of electric current with duration less than 1 second is applied to the specimen, while the specimen is being deformed in the plastic region under quasi-static tensile loads. After a nearly instant decrease of flow stress at the pulse of electric current, the flow stress shows strain hardening until the failure of the specimen. The experimental result shows that the strain-hardening parameters (the strength coefficient and the strain-hardening exponent) of the hardening curve after the electric current strongly depend on the applied electric energy density (electric energy per unit volume). Empirical expressions are suggested to describe the hardening behavior after the pulse as a function of the electric energy density and are compared with the empirical expressions suggested for advanced high-strength steels.