Energy pathways and directionality in deformation twinning

S. Kibey, J. B. Liu, D. D. Johnson, H. Sehitoglu

Research output: Contribution to journalArticlepeer-review


We present ab initio density functional theory calculations of twinning energy pathways for two opposite twinning modes, (111) [11 2-] and (111) [1- 1- 2], in fcc materials to examine the directional nature of twinning which cannot be explained by classical twin nucleation models 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) [11 2-] mode (whose predicted stresses are in agreement with experiment), thus, ruling out twinning in the (111) [1- 1- 2] mode.

Original languageEnglish (US)
Article number181916
JournalApplied Physics Letters
Issue number18
StatePublished - 2007

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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