Details
| Original language | English |
|---|---|
| Pages (from-to) | 61-74 |
| Number of pages | 14 |
| Journal | International Journal of Plasticity |
| Volume | 39 |
| Publication status | Published - 22 Jun 2012 |
| Externally published | Yes |
Abstract
Ni2FeGa is a relatively new shape memory alloy (SMA) and exhibits superior characteristics compared to other SMAs. Its favorable properties include low transformation stress, high reversible strains and small hysteresis. The first stage of stress-induced martensitic transformation is from a cubic to a modulated monoclinic phase. The energy barriers associated with the transformation from L21 (cubic) to modulated martensite (10M-martensite) incorporating shear and shuffle are established via atomistic simulations. In addition, the slip resistance in the [111] direction and the dissociation of full dislocations into partials as well as slip in the [001] direction are studied. The unstable stacking fault energy barriers for slip by far exceeded the transformation transition state barrier permitting transformation to occur with little irreversibility. Experiments at the meso-scale on single crystals and transmission electron microscopy were conducted to provide further proof of the pseudoelastic (reversible) behavior and the presence of anti-phase boundaries. The results have implications for design of new shape memory alloys that possess low energy barriers for transformation coupled with high barriers for dislocation slip.
Keywords
- Dislocation slip, Energy barrier, Phase transformation, Pseudoelasticity, Shape memory
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: International Journal of Plasticity, Vol. 39, 22.06.2012, p. 61-74.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Transformation and slip behavior of Ni2FeGa
AU - Sehitoglu, H.
AU - Wang, J.
AU - Maier, H. J.
N1 - Funding information: The work was supported by the NSF grant CMMI-09-26813 and partly by DMR-08-03270.
PY - 2012/6/22
Y1 - 2012/6/22
N2 - Ni2FeGa is a relatively new shape memory alloy (SMA) and exhibits superior characteristics compared to other SMAs. Its favorable properties include low transformation stress, high reversible strains and small hysteresis. The first stage of stress-induced martensitic transformation is from a cubic to a modulated monoclinic phase. The energy barriers associated with the transformation from L21 (cubic) to modulated martensite (10M-martensite) incorporating shear and shuffle are established via atomistic simulations. In addition, the slip resistance in the [111] direction and the dissociation of full dislocations into partials as well as slip in the [001] direction are studied. The unstable stacking fault energy barriers for slip by far exceeded the transformation transition state barrier permitting transformation to occur with little irreversibility. Experiments at the meso-scale on single crystals and transmission electron microscopy were conducted to provide further proof of the pseudoelastic (reversible) behavior and the presence of anti-phase boundaries. The results have implications for design of new shape memory alloys that possess low energy barriers for transformation coupled with high barriers for dislocation slip.
AB - Ni2FeGa is a relatively new shape memory alloy (SMA) and exhibits superior characteristics compared to other SMAs. Its favorable properties include low transformation stress, high reversible strains and small hysteresis. The first stage of stress-induced martensitic transformation is from a cubic to a modulated monoclinic phase. The energy barriers associated with the transformation from L21 (cubic) to modulated martensite (10M-martensite) incorporating shear and shuffle are established via atomistic simulations. In addition, the slip resistance in the [111] direction and the dissociation of full dislocations into partials as well as slip in the [001] direction are studied. The unstable stacking fault energy barriers for slip by far exceeded the transformation transition state barrier permitting transformation to occur with little irreversibility. Experiments at the meso-scale on single crystals and transmission electron microscopy were conducted to provide further proof of the pseudoelastic (reversible) behavior and the presence of anti-phase boundaries. The results have implications for design of new shape memory alloys that possess low energy barriers for transformation coupled with high barriers for dislocation slip.
KW - Dislocation slip
KW - Energy barrier
KW - Phase transformation
KW - Pseudoelasticity
KW - Shape memory
UR - http://www.scopus.com/inward/record.url?scp=84869086589&partnerID=8YFLogxK
U2 - 10.1016/j.ijplas.2012.05.011
DO - 10.1016/j.ijplas.2012.05.011
M3 - Article
AN - SCOPUS:84869086589
VL - 39
SP - 61
EP - 74
JO - International Journal of Plasticity
JF - International Journal of Plasticity
SN - 0749-6419
ER -