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On the impact of nanometric γ’ precipitates on the tensile deformation of superelastic Co49Ni21Ga30 A. Reul, C. Lauhoff, P. Krooß [et al.]

Contributor(s): Reul, A | Lauhoff, Christian | Krooß, Philipp | Somsen, Christoph | Langenkämper, Dennis | Gutmann, Matthias J | Pedersen, B | Hofmann, M | Gan, W. M | Kireeva, Irina V. физик | Chumlyakov, Yuri I | Eggeler, Gunther | Niendorf, Thomas | Schmahl, Wolfgang WMaterial type: ArticleArticleContent type: Текст Media type: электронный Subject(s): мартенситное превращение | микроструктура | дифракция нейтронов | монокристаллы | сверхупругостьGenre/Form: статьи в журналах Online resources: Click here to access online In: Acta materialia Vol. 230. P. 117835 (1-11)Abstract: Results are presented reporting on the martensite domain variant selection and stress-induced martensite morphology in [001]-oriented superelastic Co49Ni21Ga30 shape memory alloy (SMA) single crystals under tensile load. In situ neutron diffraction, as well as in situ optical- and confocal laser scanning microscopy were conducted focusing on three differently treated samples, i.e. in the as-grown, solution-annealed and aged condition. An aging treatment performed at 350 °C promotes the precipitation of nanoprecipitates. These second phase precipitates contribute to an increase of the number of habit plane interfaces, while reducing lamellar martensite plate thickness compared to the as-grown and solution-annealed (precipitate free) samples. During tensile loading, all samples show a stress-induced formation of martensite, characterized by one single domain variant (“detwinned”) and one set of parallel habit planes in a shear band. The results clearly show that γ’ nanoprecipitates do not necessarily promote multi-variant interaction during tensile loading. Thus, reduced recoverability in Co-Ni-Ga SMAs upon aging cannot be solely attributed to this kind of interaction as has been proposed in literature so far.
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Results are presented reporting on the martensite domain variant selection and stress-induced martensite morphology in [001]-oriented superelastic Co49Ni21Ga30 shape memory alloy (SMA) single crystals under tensile load. In situ neutron diffraction, as well as in situ optical- and confocal laser scanning microscopy were conducted focusing on three differently treated samples, i.e. in the as-grown, solution-annealed and aged condition. An aging treatment performed at 350 °C promotes the precipitation of nanoprecipitates. These second phase precipitates contribute to an increase of the number of habit plane interfaces, while reducing lamellar martensite plate thickness compared to the as-grown and solution-annealed (precipitate free) samples. During tensile loading, all samples show a stress-induced formation of martensite, characterized by one single domain variant (“detwinned”) and one set of parallel habit planes in a shear band. The results clearly show that γ’ nanoprecipitates do not necessarily promote multi-variant interaction during tensile loading. Thus, reduced recoverability in Co-Ni-Ga SMAs upon aging cannot be solely attributed to this kind of interaction as has been proposed in literature so far.

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