Microstructural and Textural Aspects of Shear Banding in Plane Strain Deformed Fcc Metals

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Periodic crystal lattice rotations within compact clusters of shear bands, developed in copper, have been characterized over a range of scales by optical microscopy, high resolution FEG-SEM-EBSD and TEM orientation mapping, to examine the role of local lattice re-orientation on slip propagation across pre-existing barriers to dislocation motion. Two different cases were analysed in detail. The single crystal analysis addresses the relation between the crystallographic microtexture and microstructure development due to the crystal anisotropy after a strain path change. All the changes in strain path directly lead to crystallite subdivisions and strain localization in the form of macroscopically visible bands of different morphology at the micro scale. The elongated cell substructure formed during primary straining was the source of anisotropy after changing deformation path. It is thought that the presence of this structure (here subcells) as barriers to dislocation motion is crucial for the occurrence of shear banding. The analysis of pure polycrystalline copper has been focused on the influence of local lattice re-orientations within particular grains on slip propagation across grain boundaries. The crystal lattice rotated in such a way that one of the {111} slip planes became nearly parallel to the direction of maximum shear (due to the actual state of anisotropy). A natural consequence of this rotation was the formation of a specific microtexture which facilitated slip propagation across grain boundaries.

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Periodical:

Solid State Phenomena (Volume 160)

Edited by:

H. Klein and R.A. Schwarzer

Pages:

257-264

DOI:

10.4028/www.scientific.net/SSP.160.257

Citation:

H. Paul "Microstructural and Textural Aspects of Shear Banding in Plane Strain Deformed Fcc Metals", Solid State Phenomena, Vol. 160, pp. 257-264, 2010

Online since:

February 2010

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$35.00

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