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Tension–compression asymmetry of pseudoelasticity in Fe–23.0at.%Al single crystals

Authors
Journal
Scripta Materialia
1359-6462
Publisher
Elsevier
Publication Date
Volume
59
Issue
7
Identifiers
DOI: 10.1016/j.scriptamat.2008.06.002
Keywords
  • Intermetallic Compounds
  • Iron Aluminides
  • Shape Memory Alloys
  • Dislocation

Abstract

Tension–compression asymmetry of pseudoelasticity in Fe–23.0at.%Al single crystals with the D0 3 structure was quantitatively examined by analyzing stress–strain response during tension–compression loading. The crystals demonstrated large pseudoelasticity associated with to-and-fro motion of 1/4〈1 1 1〉 superpartial dislocations dragging antiphase boundaries. Pseudoelasticity based on {1 0 1} slip showed little tension–compression asymmetry while an activation of {2 1 1} slip resulted in the asymmetry depending on the moving direction of 1/4〈1 1 1〉 superpartials with a screw character during loading and unloading.

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