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Philosophical Magazine Volume 85, 2005 - Issue 30
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Original Articles

High temperature deformation and extended plasticity in Mg single crystals

H. Miura * Department of Mechanical Engineering and Intelligent Systems, UEC Tokyo (The University of Electro-Communications), Chofu, Tokyo 182-8585, Japan
,
X. Yang Department of Mechanical Engineering and Intelligent Systems, UEC Tokyo (The University of Electro-Communications), Chofu, Tokyo 182-8585, Japan
,
T. Sakai Department of Mechanical Engineering and Intelligent Systems, UEC Tokyo (The University of Electro-Communications), Chofu, Tokyo 182-8585, Japan
,
H. Nogawa Department of Mechanical Engineering and Intelligent Systems, UEC Tokyo (The University of Electro-Communications), Chofu, Tokyo 182-8585, Japan
,
S. Miura Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060-8628, Japan
,
Y. Watanabe Department of Engineering Physics, Electronics and Mechanics, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
&
J. J. Jonas Department of Metallurgical Engineering, McGill University, 3610 University Street, Montreal, Quebec, H3A 2B2, Canada
 show all
Pages 3553-3565 | Received 12 May 2005, Accepted 31 May 2005, Published online: 21 Feb 2007
 
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Abstract

The high temperature deformation behavior of Mg single crystals was precisely investigated using orientation imaging microscopy. For this purpose, Mg single crystals of various orientations were tensile tested in vacuum at temperatures between 473 and 673 K. A strain rate of 4.2 × 10−4 s−1 was employed. The elongations to fracture depended strongly on crystal orientation, the lowest fracture strains being associated with multiple slip. Single crystals in which single slip was activated exhibited extended ductilities corresponding to more than 1.5 in true strain. The strong orientation dependence of the ductility can also be correlated with the ease of occurrence of dynamic recrystallization (DRX), which took place in the multiple-slip specimens. The role of twinning in the initiation of DRX is also discussed.

Acknowledgements

The authors acknowledge the financial support given by the Research Foundation for Materials Science and the Light Metals Educational Foundation, Japan.

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