Transformation stress of shape memory alloy CuZnAl: Non-Schmid behavior

S. Alkan, Y. Wu, A. Ojha, H. Sehitoglu

Research output: Contribution to journalArticlepeer-review


We establish an atomistically-informed model for predicting the non-Schmid behavior of critical stresses for bcc to orthorhombic (L21 to 18R) martensitic transformation in CuZnAl alloys. The interplay between the stacking fault displacements and the applied stress tensor components are shown to be responsible for the variation of the CRSS levels as much as a factor of almost 2.5 (25 MPa–60 MPa) depending on the crystal orientation. The predicted transformation stresses exhibit excellent agreement with the experimental results in this study and the measurements reported in the literature. The possible role of deviations from crystallographic ordering was also investigated illustrating the increase in transformation stress levels upon introduction of local disorder.

Original languageEnglish (US)
Pages (from-to)220-234
Number of pages15
JournalActa Materialia
StatePublished - May 1 2018


  • Critical resolved shear stress
  • Cu-Zn-Al
  • Martensitic transformation
  • Schmid law
  • Shape memory

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys


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