Microstructural evolution during the annealing of an extruded AZ31 magnesium alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:506

Article

Yi, Sangbong¹  Brokmeier, Heinz-Guenter^1,2  Letzig, Dietmar¹ 

[1] GKSS Forschungszentrum Geesthacht GmbH, Magnesium Innovat Ctr, D-21502 Geesthacht, Germany

[2] Tech Univ Clausthal, Inst Mat Sci & Engn, D-38678 Clausthal Zellerfeld, Germany

关键词: Magnesium alloy;    Extrusion;    Microstructure;    Grain growth;    Texture;    AZ31;   

DOI  :  10.1016/j.jallcom.2010.07.008

来源: Elsevier

【 摘 要 】

Microstructural evolution during the annealing of AZ31 extruded rod at 400 degrees C has been examined by employing neutron diffraction and electron backscatter diffraction (EBSD). In the as-extruded bar, equiaxed grains smaller than 5 mu M and large elongated grains having significant degrees of internal misorientation are oriented mainly with < 1 0 <(1)over bar> 0 > parallel to the extrusion direction. Rapid grain growth occurs within the 180s annealing period at 400 degrees C at the expense of the small grains with the internal orientation gradient as driving force. After short time annealing, small equiaxed grains are formed inside the large elongated grains, and grains having < 1 1 <(2)over bar> 0 > parallel to the extrusion direction show preferred growth. As a result, a transition of the main texture component to the < 1 1 <(2)over bar>0 > component occurs after annealing for 1800 s at 400 degrees C. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

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