Transverse texture and microstructure gradients in friction-stir welded 2519 aluminum.

Conference · Wed Jan 01 04:00:00 EST 2003

OSTI ID:976560

Bingert, J F ^[1]; Fonda, R W ^[2]

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1. John F.
2. Richard W.

Friction-stir welding produces severe thermomechanical transients that generate crystallographic texture evolution throughout the weld-affected microstructure . In this study, a friction stir weld in a coarse-grained 2519 aluminum plate was investigated in order to resolve the influence of these thermal and deformation effects on texture and microstructure development . Automated electron backscatter diffraction (EBSD) was applied to spatially resolve orientations in the base metal, weld nugget, and thermomechanical and heat-affected zones. Results show a gradient demarcated by an alteration in boundary character, texture, and precipitate distribution between the thermomechanical affected zone and the recrystallized weld nugget . EBSD scans and microstructural characterizations reveal substructure evolution from the base plate to the nugget indicative of dynamic recovery and recrystallization processes . Experimental results of texture evolution, however, did not directly follow from considerations of simplified deformation gradients and resultant simple shear textures resulting from restricted glide .

• Research Organization: Los Alamos National Laboratory
• Sponsoring Organization: DOE
• OSTI ID: 976560
• Report Number(s): LA-UR-03-1103
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
DEFORMATION
DIFFRACTION
DISTRIBUTION
ELECTRONS
FRICTION
HEAT AFFECTED ZONE
MICROSTRUCTURE
PLATES
RECRYSTALLIZATION
SHEAR
TEXTURE
TRANSIENTS
WELDING