Transformation and slip behavior of Ni2FeGa

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

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  • University of Illinois Urbana-Champaign (UIUC)
  • Universität Paderborn
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Details

OriginalspracheEnglisch
Seiten (von - bis)61-74
Seitenumfang14
FachzeitschriftInternational Journal of Plasticity
Jahrgang39
PublikationsstatusVeröffentlicht - 22 Juni 2012
Extern publiziertJa

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.

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Transformation and slip behavior of Ni2FeGa. / Sehitoglu, H.; Wang, J.; Maier, H. J.
in: International Journal of Plasticity, Jahrgang 39, 22.06.2012, S. 61-74.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Sehitoglu H, Wang J, Maier HJ. Transformation and slip behavior of Ni2FeGa. International Journal of Plasticity. 2012 Jun 22;39:61-74. doi: 10.1016/j.ijplas.2012.05.011
Sehitoglu, H. ; Wang, J. ; Maier, H. J. / Transformation and slip behavior of Ni2FeGa. in: International Journal of Plasticity. 2012 ; Jahrgang 39. S. 61-74.
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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.

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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.

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