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Metals 2013, 3(3), 283-297; doi:10.3390/met3030283
Article

Grain Refinement and Deformation Mechanisms in Room Temperature Severe Plastic Deformed Mg-AZ31

1,2
,
1,3,* , 1,2
,
1,2
 and
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1 IFW Dresden, Institute for Metallic Materials, Helmholtzstraße 20, Dresden 01069, Germany 2 Technische Universität Dresden, Institute of Materials Science, Dresden 01062, Germany 3 Technische Universität Bergakademie Freiberg, Institute of Materials Science, Gustav-Zeuner-Straße 5, Freiberg 09599, Germany
* Author to whom correspondence should be addressed.
Received: 27 April 2013 / Revised: 28 June 2013 / Accepted: 12 July 2013 / Published: 18 July 2013
(This article belongs to the Special Issue Nanostructured Metal and Metal Oxide Materials)
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Abstract

A Ti-AZ31 composite was severely plastically deformed by rotary swaging at room temperature up to a logarithmic deformation strain of 2.98. A value far beyond the forming limit of pure AZ31 when being equivalently deformed. It is observed, that the microstructure evolution in Mg-AZ31 is strongly influenced by twinning. At low strains the {̅1011} (10̅12) and the {̅1012} (10̅11) twin systems lead to fragmentation of the initial grains. Inside the primary twins, grain refinement takes place by dynamic recrystallization, dynamic recovery and twinning. These mechanisms lead to a final grain size of ≈1 μm, while a strong centered ring fibre texture is evolved.
Keywords: magnesium; twinning; SPD; ultra fine grained; wire; composite; rotary swaging magnesium; twinning; SPD; ultra fine grained; wire; composite; rotary swaging
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.

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Knauer, E.; Freudenberger, J.; Marr, T.; Kauffmann, A.; Schultz, L. Grain Refinement and Deformation Mechanisms in Room Temperature Severe Plastic Deformed Mg-AZ31. Metals 2013, 3, 283-297.

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