TU Darmstadt / ULB / TUbiblio

Interactions between non-screw lattice dislocations and coherent twin boundaries in face-centered cubic metals

Jin, Z.-H. and Gumbsch, P. and Albe, K. and Ma, E. and Lu, K. and Gleiter, H. and Hahn, H. (2008):
Interactions between non-screw lattice dislocations and coherent twin boundaries in face-centered cubic metals.
In: Acta Mater., Elsevier Science Publishing Company, pp. 1126-1135, 56, (5), [Online-Edition: http://www.sciencedirect.com/science/article/pii/S1359645407...],
[Article]

Abstract

In a first report {\}Jin ZH.. Gumbsch P, Ma E, Albe K, Lu K, Hahn H, et al. Scripta Mater 2006;54:1163, interactions between screw dislocation and coherent twin boundary (CTB) were studied via molecular dynamics simulations for three face-centered cubic (fcc) metals, Cu, Ni and Al. To complement those preliminary results, purely stress-driven interactions between 60 degrees non-screw lattice dislocation and CTB are considered in this paper. Depending on the material and the applied strain, slip has been observed to interact with the boundary in different ways. If a 60 degrees dislocation is forced by an external stress into a CTB, it dissociates into different partial dislocations gliding into the twin as well as along the twin boundary. A sessile dislocation lock may be generated at the CTB if the transited slip is incomplete. The details of the interaction are controlled by the material-dependent energy barriers for the formation of Shockley partial dislocations from the site where the lattice dislocation impinges upon the boundary.

Item Type: Article
Erschienen: 2008
Creators: Jin, Z.-H. and Gumbsch, P. and Albe, K. and Ma, E. and Lu, K. and Gleiter, H. and Hahn, H.
Title: Interactions between non-screw lattice dislocations and coherent twin boundaries in face-centered cubic metals
Language: English
Abstract:

In a first report {\}Jin ZH.. Gumbsch P, Ma E, Albe K, Lu K, Hahn H, et al. Scripta Mater 2006;54:1163, interactions between screw dislocation and coherent twin boundary (CTB) were studied via molecular dynamics simulations for three face-centered cubic (fcc) metals, Cu, Ni and Al. To complement those preliminary results, purely stress-driven interactions between 60 degrees non-screw lattice dislocation and CTB are considered in this paper. Depending on the material and the applied strain, slip has been observed to interact with the boundary in different ways. If a 60 degrees dislocation is forced by an external stress into a CTB, it dissociates into different partial dislocations gliding into the twin as well as along the twin boundary. A sessile dislocation lock may be generated at the CTB if the transited slip is incomplete. The details of the interaction are controlled by the material-dependent energy barriers for the formation of Shockley partial dislocations from the site where the lattice dislocation impinges upon the boundary.

Journal or Publication Title: Acta Mater.
Volume: 56
Number: 5
Publisher: Elsevier Science Publishing Company
Uncontrolled Keywords: Dislocation, Slip, Twinning, Twin grain boundary, Molecular dynamics
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 28 Feb 2012 14:55
Official URL: http://www.sciencedirect.com/science/article/pii/S1359645407...
Identification Number: doi:10.1016/j.actamat.2007.11.020
Related URLs:
Funders: This research was supported by the Deutsche Forschungsgemeinschaft (DFG) and Forschungszentrum Karlsruhe (FZK).
Export:
Suche nach Titel in: TUfind oder in Google

Optionen (nur für Redakteure)

View Item View Item