0309538 - ÚJF 2009 RIV GB eng J - Journal Article
Molnar, P. - Šittner, P. - Lukáš, Petr - Hannula, S.-P. - Heczko, O.
Stress-induced martensite variant reorientation in magnetic shape memory Ni-Mn-Ga single crystal studied by neutron diffraction.
[Tlakem vyvolané rezonace varianty v magnetické tvarové paměti jednoduchého krystalu Ni-Mn-Ga studovaná difrakcí neutronů.]
Smart Materials and Structures. Roč. 17, č. 3 (2008), 035014/1-035014/5. ISSN 0964-1726. E-ISSN 1361-665X
Institutional research plan: CEZ:AV0Z10480505
Keywords : NI2MNGA * Transformation * Alloy
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 1.743, year: 2008

Stress-induced martensite variant reorientation in magnetic shape memory Ni-Mn-Ga single crystal was studied in situ by the neutron diffraction technique. Principles of determination of individual tetragonal martensitic variants in shape memory alloys are explained. Using neutron diffraction we show that the macroscopic strain originates solely from the martensite structure reorientation or variant redistribution. Neutron diffraction also reveals that the reorientation of martensite is not fully completed even at a stress value of 25 MPa, which is about 20 times larger than the mean stress needed for reorientation. Only one twinning system is active during the reorientation process.

Tlakem vyvolané rezonace varianty v magnetické tvarové paměti jednoduchého krystalu Ni-Mn-Ga studovaná difrakkcí neutronů.Jsou vysvětleny principy individuálních magnetických variant ve slitinách s tvarovou pamětí.
Permanent Link: http://hdl.handle.net/11104/0161641