| Autor: |
Comstock, R. J., Wert, J. A. |
| Zdroj: |
International Journal of Materials Research: Zeitschrift fuer Metallkunde; December 2021, Vol. 88 Issue: 11 p887-895, 9p |
| Abstrakt: |
The transformation stress and strain anisotropy of single crystal shape memory alloys (SMA) is well known. Models based on the crystallography of the martensitic transformation are successful in predicting the single crystal behavior. Transformation stress and transformation strain anisotropy have also been reported in polycrystals. In the present article, previously developed unconstrained and constrained single crystal models are extended to the textured polycrystalline case in which stress-induced martensite (SIM) forms in a continuous fashion. These models are evaluated using the experimentally determined stress–strain curves for a NiTi sheet which is observed to exhibit continuous growth of stress-induced martensite. The sheet has a moderate texture with three dominant components; however, approximately isotropic transformation stress and strain are predicted. The slope of the superelastic plateau, as well as the transformation strain were used for model evaluation. The model results compare reasonably well with the present experimental results, as well as those published previously by other researchers. |
| Databáze: |
Supplemental Index |
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