Journal
ACTA MATERIALIA
Volume 149, Issue -, Pages 220-234Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.02.011
Keywords
Shape memory; Schmid law; Critical resolved shear stress; Cu-Zn-Al; Martensitic transformation
Funding
- National Science Foundation DMREF Grant [1437106]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1437106] Funding Source: National Science Foundation
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We establish an atomistically-informed model for predicting the non-Schmid behavior of critical stresses for bcc to orthorhombic (L2(1) 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. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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