Observations of Dislocation Structure in AA 7050 by EBSD

Abstract:

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During and after plastic deformation of metals, dislocations tend to evolve into generally well-defined structures that may include tangles, bands, cell walls, and various additional features. Observation of these structures by electron backscatter diffraction is only accomplished by analysis of changes in orientation from one position to the next. Excess (or geometrically necessary) dislocation densities can be inferred from 2D measurements or obtained directly from 3D measurements as indicated by Nye’s dislocation density tensor. Evolution of excess dislocation densities was measured for a split channel die specimen of aluminum alloy 7050 in the T7451 temper. Densities evolved by a factor or 1.6 for compressive deformations of 15%.

Info:

Periodical:

Materials Science Forum (Volumes 702-703)

Edited by:

Asim Tewari, Satyam Suwas, Dinesh Srivastava, Indradev Samajdar and Arunansu Haldar

Pages:

493-498

DOI:

10.4028/www.scientific.net/MSF.702-703.493

Citation:

C.C. Merriman and D. P. Field, "Observations of Dislocation Structure in AA 7050 by EBSD", Materials Science Forum, Vols. 702-703, pp. 493-498, 2012

Online since:

December 2011

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$35.00

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