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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
1,2
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 (CC BY 3.0).

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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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