Modeling of pseudotwinning in Fe3Ga

J. Wang, H. Sehitoglu

Research output: Contribution to journalArticlepeer-review

Abstract

Pseudotwinning is an important deformation mechanism that can produce reversible deformations similar to the shape memory phenomenon. Pseudotwinning merits further consideration from a modeling viewpoint as it could open new frontiers for discovery of alloys with recoverability of deformation. In this study, we focus on the Fe3Ga (D03 and L12 lattices) with atomistic simulations. We present a pseudotwin nucleation model based on the generalized planar fault energy from first-principles calculations. The minimization of the total energy at the mesoscale associated with pseudotwin nucleation leads to determination of the twinning stress. The low energy barriers and twinning stress demonstrate that pseudotwinning in D0 3 Fe3Ga is a possible deformation mode, but pseudotwinning is unlikely to occur in L12 Fe3Ga due to the significantly high energy barrier and twinning stress. The predicted twinning stress is compared with experimental measurements, and the results show very good agreement. Hence, we suggest that the results provide a quantitative methodology to understanding and determining pseudotwinning in ordered alloys.

Original languageEnglish (US)
Article number055008
JournalModelling and Simulation in Materials Science and Engineering
Volume22
Issue number5
DOIs
StatePublished - Jul 1 2014

Keywords

  • critical stress
  • density functional theory
  • pseudotwinning
  • reversible deformation
  • twinning

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Computer Science Applications

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