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Transmission electron microscopy study of microstructural evolution in nanograined Ni-Ti microwires heat treated by electric pulse
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SYSNO ASEP 0365169 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Transmission electron microscopy study of microstructural evolution in nanograined Ni-Ti microwires heat treated by electric pulse Author(s) Delville, R. (BE)
Malard, B. (FR)
Pilch, Jan (FZU-D) RID
Šittner, Petr (FZU-D) RID, ORCID
Schryvers, D. (BE)Source Title Solid State Phenomena - ISSN 1012-0394
172-174, č. 6 (2011), s. 682-687Number of pages 6 s. Language eng - English Country CH - Switzerland Keywords transmission electron microscopy ; shape memory alloy ; martensitic transformation ; dislocation slip ; nanograins Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects LA10010 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000303359700105 DOI 10.4028/www.scientific.net/SSP.172-174.682 Annotation Transmission electron microscopy and mechanical testing were employed to investigate the evolution of microstructure and functional superelastic properties of 0.1mm diameter as-drawn Ni-Ti wires subjected to a non-conventional heat treatment by controlled electric pulse current. This method enables a finer control of the recovery and recrystallisation processes taking place during the heat treatment and accordingly a better control on the final microstructure. The best functional properties were obtained for heat-treated Ni-Ti wires having a nanograined microstructure (20-50 nm) partially recovered through polygonization and partially recrystallized. Such microstructure is highly resistant against dislocation slip upon cycling, while microstructures annealed for longer time and showing mostly recrystallized grains were prone to dislocation slip, particularly as the grain size exceeds 100 nm. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2012
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