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

Metals

Enrico Knauer¹  Jens Freudenberger¹  Tom Marr¹  Alexander Kauffmann¹ 

[1] IFW Dresden, Institute for Metallic Materials, Helmholtzstraße 20, Dresden 01069, Germany; E-Mails:

关键词: magnesium;    twinning;    SPD;    ultra fine grained;    wire;    composite;    rotary swaging;   

DOI  :  10.3390/met3030283

来源: mdpi

【 摘 要 】

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 {1̄011} 〈101̄2〉 and the {1̄012} 〈101̄1〉 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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland