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Advances in Materials Science and Engineering
Volume 2014 (2014), Article ID 717452, 7 pages
http://dx.doi.org/10.1155/2014/717452
Research Article

Compression Deformation Behavior of AZ81 Magnesium Alloy at Elevated Temperatures

School of Materials Science and Engineering, Shanxi Magnesium and Magnesium Alloy Engineering Technology Research Center, Taiyuan University of Science and Technology, Taiyuan 030024, China

Received 23 January 2014; Accepted 9 May 2014; Published 29 May 2014

Academic Editor: Gang Liu

Copyright © 2014 Xiaoping Luo 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 hot deformation behavior of an AZ81 magnesium alloy was investigated by hot compressive testing on a Gleeble-1500 thermal mechanical simulator in the temperature range from 200 to 400°C and in the strain rate range of 0.001–5  . The relationships among flow stress, strain rate, and deformation temperature were analyzed, and the deformation activation energy and stress exponent were calculated. The microstructure evolution of the AZ81 magnesium alloy under high deformation was examined. The results indicated that the maximum value of the flow stress increased with the decrease of deformation temperature and the increase of strain rate. When the deformation temperature is constant, the flow stress of the AZ81 magnesium alloy increases with the increase of strain rate, which can be demonstrated by a Zener-Hollomon parameter in a hyperbolic-sine-type equation with a hot compression deformation activation energy of 176.01 KJ/mol and basic hot deformation material factors A, n, and a in the analytical expression of the AZ81 magnesium alloy flow stress of , 7.85, and 0.00866 MPa, respectively.