On the impact of nanometric γ’ precipitates on the tensile deformation of superelastic Co49Ni21Ga30

doi:10.1016/j.actamat.2022.117835

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On the impact of nanometric γ’ precipitates on the tensile deformation of superelastic Co49Ni21Ga30	2 MB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.1016/j.actamat.2022.117835

#мартенситное превращение

Title: On the impact of nanometric γ’ precipitates on the tensile deformation of superelastic Co49Ni21Ga30
Creator: Reul, A.
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Lauhoff, Christian
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Krooß, Philipp
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Somsen, Christoph
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Langenkämper, Dennis
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Gutmann, Matthias J.
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Pedersen, B.
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Hofmann, M.
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Gan, W. M.
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Kireeva, Irina V. (физик)
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Chumlyakov, Yuri I.
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Eggeler, Gunther
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Niendorf, Thomas
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Schmahl, Wolfgang W.
Date: 2022
DOI: 10.1016/j.actamat.2022.117835
Description: 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.