Paper Title:
Shear Deformation and Texture Evolution in Al Alloys Processed for One Pass by ECAP
  Abstract

The evolution of texture and deformation in the grains during one pass of equal-channel angular pressing (ECAP) was examined for fine grained high strength and low strength Al alloys and a coarse grained low strength Al alloy. The materials were analysed using electron back-scatter diffraction (EBSD). The results are consistent with the materials responding to the intense macroscopic shear stress by deformation of individual grains through movement of dislocations on one or more of the slip crystallographic slip planes {hkl} that are favourably oriented, combined with the rotation of grains to directions that bring main crystallographic slip planes parallel to the macroscopic shear direction and crystallographic slip directions parallel to two main shear directions. Contrary to reports claiming up to 4 slip systems are activated, it was observed that only the {111}<110> and {001}<110> shear systems are activated. Macroscopic shear deformation occurs on two shear planes: the main shear plane (MSP), equivalent to the simple shear plane, and a secondary shear plane which is perpendicular to the MSP.

  Info
Periodical
Materials Science Forum (Volumes 584-586)
Edited by
Yuri Estrin and Hans Jürgen Maier
Pages
679-684
DOI
10.4028/www.scientific.net/MSF.584-586.679
Citation
M. J. Starink, S. C. Wang, X. G. Qiao, N. Gao, H. J. Roven, T. G. Langdon, "Shear Deformation and Texture Evolution in Al Alloys Processed for One Pass by ECAP", Materials Science Forum, Vols. 584-586, pp. 679-684, 2008
Online since
June 2008
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