Intermartensitic transformation between modulated structures in Ni-Mn-Ga(-Fe) single crystal

0557167 - FZÚ 2023 RIV GB eng A - Abstrakt
Heczko, Oleg - Veřtát, Petr - Klicpera, M. - Fabelo, O. - Straka, Ladislav
Intermartensitic transformation between modulated structures in Ni-Mn-Ga(-Fe) single crystal.
Acta Crystallographica Section A-Foundation and Advances. Oxford Blackwell. Roč. 77, Aug. (2021), s. 274-274. ISSN 2053-2733. E-ISSN 2053-2733.
[IUCr Congress /25./. 14.08.2021-22.08.2021, Prague]
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; 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: intermartensitic * phase transformation * ferroelastic Ni-Mn-Ga * modulated structures * martensite * austenite
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
http://scripts.iucr.org/cgi-bin/paper?S0108767321094083

Heusler alloys close to stoichiometric Ni2MnGa undergo a sequence of difussionless, displacive phase transformations from parent, cubic austenite to various martensitic or ferroelastic phases, modulated 10M and 14M (also marked 5M and 10M) and non-modulated (NM) tetragonal phase depending on composition. Often the cascade of intermartensitic transformations (10M-14M-NM) is observed with decreasing temperature or with increasing mechanical stress [1]. Owing to ferromagnetic state and highly mobile twin boundaries in modulated phases the relatively weak magnetic field can induce the reorientation of ferroelastic domains via twin boundary motion resulting in giant magnetic-field-induced strain up to 12% in single crystal [2] called magnetic shape memory (MSM) effect [3].
Trvalý link: http://hdl.handle.net/11104/0331423