Microstructure evolution and strain localization during shear deformation of an aluminium alloy

Strain localization by shear banding during shear tests of a commercial aluminium alloy is described at different scales using optical microscopy, SEM and TEM. The evolution of the dislocation microstructure is correlated to the global mechanical behaviour. Two initial states of the material—heavily...

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Bibliographic Details
Published in:Acta materialia 1996-10, Vol.44 (10), p.4195-4208
Main Authors: Gaspérini, M., Pinna, C., Swiatnicki, W.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Deformation, plasticity, and creep
Exact sciences and technology
Materials science
Metals. Metallurgy
Physics
Treatment of materials and its effects on microstructure and properties
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Summary:Strain localization by shear banding during shear tests of a commercial aluminium alloy is described at different scales using optical microscopy, SEM and TEM. The evolution of the dislocation microstructure is correlated to the global mechanical behaviour. Two initial states of the material—heavily cold-rolled and recovered after cold-rolling—having the same crystallographical texture are compared. The localization occurs only for the as-rolled samples, and its consequence on damage and fracture depends on the angle between the initial rolling direction and the shearing direction. The discussion focuses on the predominant role of the microstructure, rather than the crystallographic texture, in the localization phenomena. Macroscopic arguments for localization are also evoked. La localisation en bandes de cisaillement au cours d'essais de cisaillement sur un alliage commercial d'aluminium est décrite à différentes échelles, par microscopie optique, MEB et MET. L'évolution de la microstructure de dislocations est corrélée au comportement mécanique global. Deux états initiaux—fortement laminé à froid, et restauré après laminage—, de même texture cristallographique, ont été comparés. La localisation n'apparait que pour l'état laminé, et sa conséquence sur l'endommagement et la rupture dépend de l'angle entre la direction de laminage initiale et la direction de cisaillement. La discussion met en évidence le rôle prédominant de la microstructure, par rapport à la texture, dans le phénomène de localisation. Des arguments macroscopiques pour la localisation sont également évoqués.
ISSN:1359-6454
1873-2453
DOI:10.1016/S1359-6454(96)00046-8