Modeling the transformation stress of constrained shape memory alloy single crystals
- Univ. of Virginia, Charlottesville, VA (United States). Dept. of Materials Science and Engineering
Shape memory alloys (SMA) are a unique class of engineering materials that can be further exploited with accurate polycrystal constitutive models. Previous investigators have modeled stress-induced martensite formation in unconstrained single crystals. Understanding stress-induced martensite formation in constrained single crystals is the next step towards the development of a constitutive model for textured polycrystalline SMA. Such models have been previously developed for imposition of axisymmetric strain on a polycrystal with random crystal orientation; the present paper expands the constrained single crystal SMA model to encompass arbitrary imposed strains. To evaluate the model, axisymmetric tension and compression strains and pure shear strain are imposed on three SMA: NiTi, Cu-Al-Ni ({beta}{sub 1}{yields}{gamma}{prime}{sub 1}) and Ni-Al. Model results are then used to understand the anisotropy and asymmetry of transformation stress in the three SMA considered. Finally, the impact of the present results on polycrystal behavior is addressed.
- OSTI ID:
- 389803
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 9 Vol. 44; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
Similar Records
Predicting the orientation-dependent stress-induced transformation and detwinning response of shape memory alloy single crystals
Modeling the effects of stress state and crystal orientation on the stress-induced transformation of NiTi single crystals