Number of the records: 1
Effect of crystal quality on twinning stress in Ni–Mn–Ga magnetic shape memory alloys
- 1.
SYSNO ASEP 0546337 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of crystal quality on twinning stress in Ni–Mn–Ga magnetic shape memory alloys Author(s) Musiienko, Denys (FZU-D) ORCID
Nilsén, Frans (FZU-D) ORCID
Armstrong, Andrew (FZU-D)
Rameš, Michal (FZU-D) RID, ORCID
Veřtát, Petr (FZU-D) RID, ORCID
Colman, R.H. (CZ)
Čapek, Jaroslav (FZU-D) ORCID
Müllner, P. (US)
Heczko, Oleg (FZU-D) RID, ORCID
Straka, Ladislav (FZU-D) ORCIDNumber of authors 10 Source Title Journal of Materials Research and Technology-JMR&T. - : Elsevier - ISSN 2238-7854
Roč. 14, Sept. (2021), s. 1934-1944Number of pages 11 s. Language eng - English Country BR - Brazil Keywords magnetic shape memory ; twinning stress ; crystal mosaicity ; microstructure ; single crystal ; Ni–Mn-Ga 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) GA21-06613S GA ČR - Czech Science Foundation (CSF) LM2018096 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF20_079/0017754 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000702861300009 EID SCOPUS 85111684247 DOI 10.1016/j.jmrt.2021.07.081 Annotation Low twinning stress (TS) is a prerequisite for magnetic shape memory functionality. We compare Ni50Mn28Ga22 single crystals from four different producers to reveal the effect of crystal quality on the TS. Near the reverse martensite transformation, the TS is generally low, about 1 MPa, regardless of mosaicity of up to 1.7° and chemical composition deviations of up to 2 at.% of Mn. Pure type I and type II twin boundaries occur in crystals with smooth chemical composition gradients. The temperature dependences of TS follow linear trends for type I twins and type II twins, enabling a very low TS down to 2 K for the latter. An intermediate slope appears for mixed type I/type II twin boundaries in a crystal with sharp local chemical deviations. We conclude that the crystal quality affects the magnitude of the TS indirectly, through its impact on the character of the twin boundaries. The effect is weak near the martensite transformation temperature and strong at low temperatures. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2022 Electronic address http://hdl.handle.net/11104/0322885
Number of the records: 1