Microstructure, texture, and mechanical properties of friction stir welded commercial brass alloy

Microstructural evolution during friction stir welding of single-phase brass and corresponding mechanical properties were investigated. For this purpose, 2mm thick brass plate was friction stir welded at a rotational speed of 450rpm and traverse speed of 100mm/min. The microstructure of the joint wa...

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Bibliographic Details
Published in:Materials characterization 2016-09, Vol.119, p.84-91
Main Authors: Heidarzadeh, A., Saeid, T., Klemm, V.
Format: Article
Language:English
Subjects:
BACKSCATTERING
BRASS
BRASSES
DISLOCATIONS
Dynamic recrystallization
ELECTRON DIFFRACTION
Evolution
Formations
FRICTION
Friction stir welding
FRICTION WELDING
GRAIN BOUNDARIES
HARDNESS
MATERIALS SCIENCE
MECHANICAL PROPERTIES
Microstructure
MICROSTRUCTURES
OPTICAL MICROSCOPY
PROPERTIES
RECRYSTALLIZATION
SCANNING ELECTRON MICROSCOPY
Surface layer
TEXTURE
TEXTURES
TRANSMISSION ELECTRON MICROSCOPY
VELOCITY
WELDED JOINTS
WELDING
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Summary:Microstructural evolution during friction stir welding of single-phase brass and corresponding mechanical properties were investigated. For this purpose, 2mm thick brass plate was friction stir welded at a rotational speed of 450rpm and traverse speed of 100mm/min. The microstructure of the joint was studied using optical microscopy, scanning electron microscopy equipped with electron back scattered diffraction system, and scanning transmission electron microscopy. The mechanical properties were measured using hardness and tensile tests. The formation of subgrains and their transformation into new grains in conjunction with existence of A1⁎, A2⁎ and C texture components revealed that the continuous dynamic recrystallization plays a dominant role in the microstructural evolution. However, grain boundary bulging, along with the formation of twin boundaries, and presence of the G texture component showed that the discontinues dynamic recrystallization may participate in the new grain formation. Furthermore, the different strengthening mechanisms, which caused the higher strength of the joint, were discussed. [Display omitted] •Microstructural evolution during FSW of a single phase brass was investigated.•CDRX and DDRX were the main mechanisms of the grain structure formation during FSW.•GDRX and SRX were not contributed in grain structure formation.•The lamellas TBs were formed in the SZ of the joints.•Grain boundary, dislocation, and texture effects resulted in higher strength.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2016.07.009