Modeling of pseudoelasticity via reversible slip in Fe3Ga

J. Wang, H. Sehitoglu

Research output: Contribution to journalArticlepeer-review

Abstract

The Fe3Ga alloy with the cubic D03 lattice possesses considerable recoverable strain due to the slip reversibility. Pseudoelasticity via reversible slip in Fe3Ga is studied with atomistic simulations. An extended Peierls-Nabarro model incorporating the Generalized Stacking Fault Energy (GSFE) is established to determine Peierls stress in D03 and L12 Fe3Ga. The back stress and frictional stress are predicted during loading and unloading process. These stress magnitudes govern the reversible slip in Fe3Ga. The results show that the reversible slip observed experimentally in D03 Fe3Ga is induced by its larger back stress compared to its frictional stress. In contrast, the reversible slip cannot appear in L12 since its back stress is not large enough to pull back superpartials, and thus the existence of L1 2 will suppress the pseudoelasticity of D03 Fe 3Ga and results in decreasing the strain recovery. The present study has explored the theoretical foundations of this phenomenon arising from high back stresses responsible for cyclic reversible dislocation motion.

Original languageEnglish (US)
Pages (from-to)34-42
Number of pages9
JournalComputational Materials Science
Volume87
DOIs
StatePublished - May 2014

Keywords

  • APB
  • Critical stress
  • Density Functional Theory
  • Pseudoelasticity
  • Reversible slip

ASJC Scopus subject areas

  • General Computer Science
  • General Chemistry
  • General Materials Science
  • Mechanics of Materials
  • General Physics and Astronomy
  • Computational Mathematics

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