Dislocation interactions and low-angle grain boundary strengthening

B. Liu, D. Raabe, P. Eisenlohr, F. Roters, A. Arsenlis, G. Hommes

Research output: Research - peer-reviewArticle

  • 39 Citations

Abstract

The transmission of an incoming dislocation through a symmetrical low-angle tilt grain boundary (GB) is studied for {1 1 0}〈1 1 1〉 slip systems in body-centered cubic metals using discrete dislocation dynamics (DD) simulations. The transmission resistance is quantified in terms of the different types of interactions between the incoming and GB dislocations. Five different dislocation interaction types are considered: collinear, mixed-symmetrical junction, mixed-asymmetrical junction, edge junction, and coplanar. Mixed-symmetrical junction formation events are found not only to cause a strong resistance against the incident dislocation penetration, but also to transform the symmetrical low-angle tilt GB into a hexagonal network (a general low-angle GB). The interactions between the incident dislocation and the GB dislocations can form an array of 〈1 0 0〉 dislocations (binary junctions) in non-coplanar interactions, or a single 〈1 0 0〉 dislocation in coplanar interaction. We study how the transmission resistance depends on the mobility of 〈1 0 0〉 dislocations. 〈1 0 0〉 dislocations have usually been treated as immobile in DD simulations. In this work, we discuss and implement the mobility law for 〈1 0 0〉 dislocations. As an example, we report how the mobility of 〈1 0 0〉 dislocations affects the equilibrium configuration of a ternary dislocation interaction.

LanguageEnglish (US)
Pages7125-7134
Number of pages10
JournalActa Materialia
Volume59
Issue number19
DOIs
StatePublished - Nov 2011
Externally publishedYes

Profile

Dislocations (crystals)
Grain boundaries
Computer simulation
Metals

Keywords

  • Dislocation dynamics
  • Dislocation interactions
  • Dislocation reactions
  • Low-angle grain boundary
  • Strength

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

Cite this

Liu, B., Raabe, D., Eisenlohr, P., Roters, F., Arsenlis, A., & Hommes, G. (2011). Dislocation interactions and low-angle grain boundary strengthening. Acta Materialia, 59(19), 7125-7134. DOI: 10.1016/j.actamat.2011.07.067

Dislocation interactions and low-angle grain boundary strengthening. / Liu, B.; Raabe, D.; Eisenlohr, P.; Roters, F.; Arsenlis, A.; Hommes, G.

In: Acta Materialia, Vol. 59, No. 19, 11.2011, p. 7125-7134.

Research output: Research - peer-reviewArticle

Liu, B, Raabe, D, Eisenlohr, P, Roters, F, Arsenlis, A & Hommes, G 2011, 'Dislocation interactions and low-angle grain boundary strengthening' Acta Materialia, vol 59, no. 19, pp. 7125-7134. DOI: 10.1016/j.actamat.2011.07.067
Liu B, Raabe D, Eisenlohr P, Roters F, Arsenlis A, Hommes G. Dislocation interactions and low-angle grain boundary strengthening. Acta Materialia. 2011 Nov;59(19):7125-7134. Available from, DOI: 10.1016/j.actamat.2011.07.067
Liu, B. ; Raabe, D. ; Eisenlohr, P. ; Roters, F. ; Arsenlis, A. ; Hommes, G./ Dislocation interactions and low-angle grain boundary strengthening. In: Acta Materialia. 2011 ; Vol. 59, No. 19. pp. 7125-7134
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