Twin microstructure of Ni-Mn-Ga alloys with very low twinning stress

0372625 - FZÚ 2012 DE eng C - Konferenční příspěvek (zahraniční konf.)
Straka, L. - Heczko, Oleg - Lanska, N. - Drahokoupil, Jan - Seiner, Hanuš - Soroka, A. - Hänninen, H. - Sozinov, A.
Twin microstructure of Ni-Mn-Ga alloys with very low twinning stress.
ICFSMA 2011. 3rd International Conference on Ferromagnetic Shape Memory Alloys. Dresden: IFW Dresden, 2011, s. 87-88. ISBN N.
[International Conference on Ferromagnetic Shape Memory Alloys /3./ - ICFSMA 2011. Dresden (DE), 18.07.2011-22.07.2011]
Výzkumný záměr: CEZ:AV0Z10100520; CEZ:AV0Z20760514
Klíčová slova: mobility of twin boundary * twinning in modulated martensite * magnetic shape memory effect * Ni-Mn-Ga
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

We present a detailed investigation of the twin microstructure of 5M Ni-Mn-Ga single crystals with very low twinning stress. We show that the twin microstructure is komplex one and that approximation of the 5M crystal structure by a tetragonal lattice does not suffice to explain all observed features, while monoclinic approximation with modulation taken in account seems to describe most features. The monoclinicity and modulation of the lattice actually seems to be tightly associated with the extraordinary low twinning stress of the studied alloys.
Trvalý link: http://hdl.handle.net/11104/0205892