Grain Orientation Dependence of Extended Planar Dislocation Boundaries in Cold-Rolled Polycrystalline Aluminium

Abstract:

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The dependence on the grain orientation of the alignment of planar dislocation boundaries in plastically deformed metals has been investigated by examining grains of S orientation ({123}<63-4>) in cold-rolled polycrystalline aluminum. For the ideal S orientation the {111} slip plane associated with the highest resolved shear stress lies either at +40° or -40° to the rolling direction in the longitudinal section, with two S variants corresponding to each case. Boundary traces in S orientation grains in the rolled sample were examined by the combined use of electron channeling contrast imaging and electron backscatter diffraction orientation mapping. In each case the +/- sense of the observed planar boundary traces matched that of the {111} slip plane with the highest resolved shear stress showing that the alignment of the boundaries is predominantly controlled by crystallographic rather than macroscopic considerations.

Info:

Periodical:

Key Engineering Materials (Volumes 353-358)

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie

Pages:

711-714

DOI:

10.4028/www.scientific.net/KEM.353-358.711

Citation:

F. X. Lin et al., "Grain Orientation Dependence of Extended Planar Dislocation Boundaries in Cold-Rolled Polycrystalline Aluminium", Key Engineering Materials, Vols. 353-358, pp. 711-714, 2007

Online since:

September 2007

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Price:

$35.00

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