In-situ TEM strainning of hierarchically twinned non-modulated martensite in Ni-Mn-Ga

0399156 - FZÚ 2014 US eng C - Konferenční příspěvek (zahraniční konf.)
Ge, Y. - Zárubová, Niva - Heczko, Oleg - Hannula, S.-P.
In-situ TEM strainning of hierarchically twinned non-modulated martensite in Ni-Mn-Ga.
ICFSMA 2013. 3rd International Conference on Ferromagnetic Shape Memory Alloys. Boise, Idaho: Boise, 2013, s. 92-93.
[International Conference on Ferromagnetic Shape Memory Alloys /4./ - ICFSMA 2013. Boise, Idaho (US), 03.06.2013-07.06.2013]
Grant CEP: GA ČR(CZ) GAP107/11/0391; GA ČR GAP107/12/0800
Institucionální podpora: RVO:68378271
Klíčová slova: Ni-Mn-Ga * in-situ TEM * magnetic shape memory * deformation twinning * twinning dislocation
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

Twinning/detwinning processes were followed on non-modulated (NM) Ni-Mn-Ga martensite by in-situ TEM straining experiments. The processes were detected on the two levels of hierarchically twinned structure. First, one of paired internal twins vanish, and then new twins form in the detwinned areas.Both stages involve movement of twinning dislocations. Boundaries between internally twinned domains are incoherent and immobile. lnterfaces between the internal twins are coherent and their gradual forward movement under stress is caused by the twinning dislocations.
Trvalý link: http://hdl.handle.net/11104/0226507