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dc.contributor.authorAhadi, Aslan
dc.contributor.authorKhaledialidusti, Rasoul
dc.contributor.authorKawasaki, Takuro
dc.contributor.authorHarjo, Stefanus
dc.contributor.authorBarnoush, Afrooz
dc.contributor.authorTsuchiya, Koichi
dc.date.accessioned2021-04-07T09:08:06Z
dc.date.available2021-04-07T09:08:06Z
dc.date.created2019-10-01T15:13:12Z
dc.date.issued2019
dc.identifier.citationActa Materialia. 2019, 173 281-291.en_US
dc.identifier.issn1359-6454
dc.identifier.urihttps://hdl.handle.net/11250/2736545
dc.description.abstractThe temperature-dependent elasticity of the B19′ NiTi is unknown today. To gain insights into the lattice-level temperature-dependent elasticity of the B19′ crystal, we present results of in-situ neutron diffraction experiments performed on polycrystalline martensitic specimens in the temperature range of 300 down to 50 K. The experimental results are compared with the density functional theory molecular dynamics (DFT-MD) and Quasi Harmonic Approximation (QHA) calculations. The results confirm that the temperature-dependent Young's modulus (TDYM) of the B19′ crystal is strongly anisotropic. For different crystallographic orientations, the change in Young's modulus over the temperature range of 300–50 K (), ranges from  = 2.8 ± 3.5 GPa (extremely weak dependence) to  = 59.6 ± 9.1 GPa (strong dependence). Moreover, it is found that the orientation-specific TDYM and thermal expansion (TE) of the B19′ crystal are correlated. The crystallographic orientations with weak and negative TE responses exhibit a weaker TDYM than the orientations with positive TE. The DFT-MD and QHA results capture qualitatively the above experimental observations and further show that there are orientations in a B19′ crystal exhibiting elastic softening (<0) and ideally no change in Young's modulus (= 0) with cooling. This is found to originate from the strong negative temperature dependence of c35 stiffness constant. The experimental results along with the first-principles calculations confirm that the Elinvar and Invar are two confluent properties in NiTi SMAs and can be tailored by texturing B19′ crystallographic orientations.en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.titleNeutron diffraction study of temperature-dependent elasticity of B19′ NiTi---Elinvar effect and elastic softeningen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionacceptedVersionen_US
dc.source.pagenumber281-291en_US
dc.source.volume173en_US
dc.source.journalActa Materialiaen_US
dc.identifier.doi10.1016/j.actamat.2019.05.027
dc.identifier.cristin1732541
dc.relation.projectNotur/NorStore: NN9574Ken_US
dc.description.localcode"© 2019. This is the authors’ accepted and refereed manuscript to the article. Locked until 18.5.2021 due to copyright restrictions. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ "en_US
cristin.ispublishedtrue
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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
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