Nanotwinned (inter)martensite transformation interfaces in Ni.sub.50./sub.Mn.sub.25./sub.Ga.sub.20./sub.Fe.sub.5./sub. magnetic shape memory single crystal foil

0561686 - FZÚ 2023 RIV US eng J - Článek v odborném periodiku
Ge, Yanling - Straka, Ladislav - Vronka, Marek - Rameš, Michal - Sozinov, A. - Heczko, Oleg
Nanotwinned (inter)martensite transformation interfaces in Ni₅₀Mn₂₅Ga₂₀Fe₅ magnetic shape memory single crystal foil.
Materials Characterization. Roč. 190, Aug (2022), č. článku 112007. ISSN 1044-5803. E-ISSN 1873-4189
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; GA MŠMT LM2018110; GA ČR GA19-09882S
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: intermetallics * atomic scale structure * microstructure * phase transitions * transmission electron microscopy
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 4.7, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/ 10.1016/j.matchar.2022.112007

Using common and high resolution transmission electron microscopy (TEM), we study the magnetic and crystal phase structures as well as their evolution in Ni50Mn25Ga20Fe5 magnetic shape memory material with high Curie point. The particular alloying by Fe and changing thickness of the TEM foil enable us to observe all martensitic phases known in Ni-Mn-Ga Heusler alloy system and their respective transitions simultaneously. Starting from cubic austenite at about 10 nm foil thickness, the structure evolves via peculiar interleaved stripes of austenite and five-layered modulated 10M martensite to pure 10M phase with a low density of stacking faults at 40 nm thickness. With further increasing thickness, the 10M phase transforms gradually to seven-layered modulated 14M martensite with an increased density of stacking faults. Finally, the non-modulated tetragonal NM phase appears within the 14M phase by detwinning of nanotwins forming the modulated phases.

Trvalý link: https://hdl.handle.net/11104/0334203