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Article
Energy pathways and directionality in deformation twinning
Applied Physics Letters (207)
  • S. Kibey, University of Illinois at Urbana-Champaign
  • J. B. Liu, University of Illinois at Urbana-Champaign
  • Duane D. Johnson, University of Illinois at Urbana-Champaign
  • H. Sehitoglu, University of Illinois at Urbana-Champaign
Abstract
We present ab initiodensity functional theory calculations of twinning energy pathways for two opposite twinning modes, (111)[112¯] and (111)[1¯1¯2], in fcc materials to examine the directional nature of twinning which cannot be explained by classical twin nucleationmodels or the “twinnability” criterion. By accounting for these energy pathways in a multiscale model, we quantitatively predict the critical twinning stress for the (111)[1¯1¯2] mode to be substantially higher compared to the favorable (111)[112¯] mode (whose predicted stresses are in agreement with experiment), thus, ruling out twinning in the (111)[1¯1¯2] mode.
Keywords
  • Gold,
  • Nucleation,
  • Dislocations,
  • Ab initio calculations,
  • Copper
Publication Date
207
Publisher Statement
The following article appeared in Appl. Phys. Lett. 91, 181916 (2007) and may be found at http://dx.doi.org/10.1063/1.2800806. Copyright 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Citation Information
S. Kibey, J. B. Liu, Duane D. Johnson and H. Sehitoglu. "Energy pathways and directionality in deformation twinning" Applied Physics Letters Vol. 91 Iss. 18 (207)
Available at: http://works.bepress.com/duane_johnson/86/