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Recoverability of large strains and deformation twinning in martensite during tensile deformation of NiTi shape memory alloy polycrystals
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SYSNO ASEP 0511540 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Recoverability of large strains and deformation twinning in martensite during tensile deformation of NiTi shape memory alloy polycrystals Author(s) Chen, Y.C. (CN)
Molnárová, Orsolya (FZU-D) ORCID
Tyc, Ondřej (FZU-D) ORCID
Kadeřávek, Lukáš (FZU-D) ORCID
Heller, Luděk (FZU-D) RID, ORCID
Šittner, Petr (FZU-D) RID, ORCIDNumber of authors 6 Source Title Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 180, Nov (2019), s. 243-259Number of pages 17 s. Language eng - English Country GB - United Kingdom Keywords plastic-deformation ; localized deformation ; b2 phase ; transformation ; temperature ; mechanisms ; behavior ; wires ; energetics ; slip ; NiTi ; superelasticity ; shape memory alloy ; tensile test ; large deformation ; martensitic transformation ; deformation twinning ; transmission electron microscopy Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects EF16_019/0000760 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2015088 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GC17-00393J GA ČR - Czech Science Foundation (CSF) GA18-03834S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support FZU-D - RVO:68378271 UT WOS 000495519100024 EID SCOPUS 85072273148 DOI 10.1016/j.actamat.2019.09.012 Annotation Superelastic NiTi wires were deformed in tension up to gradually increasing total strains at various temperatures, recoverable strains were evaluated and lattice defects left in the microstructure of deformed wires were analyzed by TEM. The recoverable strains evaluated in tensile tests: i) are surprisingly large - exceed 10% strain at low temperatures T ≤ 20 °C, ii) are not significantly restricted by large plastic deformation up to 55% at low temperatures, iii) display local maxima in dependence on total strain in tensile tests at low temperatures, iv) decrease with increasing test temperatures and iv) increase with increasing total strain in tensile tests at high temperatures T ≥ 50 °C. Besides slip dislocations, key lattice defects created by the tensile deformation beyond the martensite yield point are deformation bands containing {114} austenite twins or R-phase. No other austenite twins were found statistically relevant.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2020 Electronic address https://doi.org/10.1016/j.actamat.2019.09.012
Number of the records: 1