Mechanism of twinning/detwinning processes in NiMnGa

0372630 - FZÚ 2012 DE eng C - Conference Paper (international conference)
Zárubová, Niva - Ge, Y. - Gemperlová, Juliana - Gemperle, Antonín - Hannula, S.-P.
Mechanism of twinning/detwinning processes in NiMnGa.
ICFSMA 2011. 3rd International Conference on Ferromagnetic Shape Memory Alloys. Dresden: IFW Dresden, 2011, s. 89-90. ISBN N.
[International Conference on Ferromagnetic Shape Memory Alloys /3./ - ICFSMA 2011. Dresden (DE), 18.07.2011-22.07.2011]
R&D Projects: GA ČR(CZ) GAP107/11/0391; GA AV ČR IAA100100920; GA AV ČR(CZ) IAA200100627
Institutional research plan: CEZ:AV0Z10100520
Keywords : Ni-Mn-Ga shape memory alloy * martensitic transformation * in-situ TEM straining
Subject RIV: BM - Solid Matter Physics ; Magnetism

Mechanism of twinning in NiMnGa has been investigated by in-situ straining in a transmission electron microscope (TEM). Detwinning processes are observed during the tensile tests of samples of self-accommodated tetragonal martensite. The more favorable martensite variants replace the less favorable ones. The process occurs via movement of twinning dislocations that nucleate in the boundaries between individual twinned regions. The dislocations glide along {101} planes, their Burgers vector is of [101] type.
Permanent Link: http://hdl.handle.net/11104/0205896