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Evolution of elastic constants of the NiTi shape memory alloy during a stress-induced martensitic transformation
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SYSNO ASEP 0542094 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Evolution of elastic constants of the NiTi shape memory alloy during a stress-induced martensitic transformation Author(s) Grabec, Tomáš (UJF-V) ORCID
Sedlák, Petr (UT-L) RID, ORCID
Zoubková, K. (CZ)
Ševčík, Martin (UT-L) ORCID
Janovská, Michaela (UT-L) RID, ORCID
Stoklasová, Pavla (UT-L) RID, ORCID
Seiner, Hanuš (UT-L) RID, ORCIDNumber of authors 7 Article number 116718 Source Title Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 208, APR (2021)Number of pages 12 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords NiTi ; shape memory alloy (SMA) ; in situ tension test ; ultrasonic characterization ; anisotropic elasticity Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Mechanical engineering Subject RIV - cooperation Institute of Thermomechanics - Acoustics R&D Projects GA20-12624S GA ČR - Czech Science Foundation (CSF) EF16_013/0001794 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UJF-V - RVO:61389005 ; UT-L - RVO:61388998 UT WOS 000636045300024 EID SCOPUS 85101186177 DOI 10.1016/j.actamat.2021.116718 Annotation We carried out an in situ ultrasonic characterization of a NiTi shape memory alloy polycrystal subjected to pseudoplastic straining. The measurement leads to a full elastic tensor of the transversely isotropic polycrystal during the stress-induced austenite -> R-phase -> B19' martensite transformation. The results reveal a strong anisotropy of the R-phase already in the low-strain state, which is then retained in character throughout the R-phase -> martensite transition and even in the stress-free oriented martensite after the unloading. By using a micromechanical model based on homogenization approaches, we show that this strong anisotropy is probably related to twin boundaries both in the R-phase and in martensite rather than to the anisotropy of the unit cell and the crystallographic texture. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2022 Electronic address https://doi.org/10.1016/j.actamat.2021.116718
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