Orientation Fragmentation in Copper, Nickel and Aluminum: A Comparative Study of the Nucleation Process

Abstract:

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An attempt to model the nucleation of fragment boundaries during cold plastic deformation of f.c.c. metals is presented. The paper focuses on intrinsic nucleation in the grain interior due to elementary processes on the dislocation level. Since orientation fragmentation seems to be linked to slip banding and the underlying mechanisms should be the same, the model is based on the elementary process of double cross-slip. Simulations were carried out for Cu, Ni and Al. Fragment boundary spacings and misorientations could be predicted in reasonable agreement with experiment for Cu. For Ni, comparable results were obtained, when a stacking fault energy at the lower end of the range of literature data was chosen. The resulting rate equation for the generation of partial disclinations as carriers of orientation fragmentation can be implemented into an earlier model for the coupled substructure and texture development during cold plastic deformation.

Info:

Periodical:

Materials Science Forum (Volumes 495-497)

Edited by:

Paul Van Houtte and Leo Kestens

Pages:

945-954

DOI:

10.4028/www.scientific.net/MSF.495-497.945

Citation:

M. Seefeldt and P. van Houtte, "Orientation Fragmentation in Copper, Nickel and Aluminum: A Comparative Study of the Nucleation Process ", Materials Science Forum, Vols. 495-497, pp. 945-954, 2005

Online since:

September 2005

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$35.00

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