In situ neutron diffraction studies of the R-phase transformation in the NiTi shape memory alloy

0185828 - UJF-V 20033155 RIV US eng J - Článek v odborném periodiku
Lukáš, Petr - Šittner, Petr - Lugovyy, Dmytro - Neov, Dimitar - Ceretti, M.
In situ neutron diffraction studies of the R-phase transformation in the NiTi shape memory alloy.
Applied Physics A - Materials Science & Processing. Roč. 74, č. 2 (2002), s. S1121-S1123. ISSN 0947-8396. E-ISSN 1432-0630
Grant CEP: GA AV ČR IAA1048107; GA ČR GA202/03/0891
Výzkumný záměr: CEZ:AV0Z1048901
Klíčová slova: martensitic transforamtions * NiTi polyctrystal
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.231, rok: 2002

Thermally induced martensitic transformations in the NiTi polycrystal during cooling were investigated in situ using the high-resolution neutron powder diffraction technique. Special attention was paid to the lattice-spacing changes accompanying the R-phase transformation which precedes the transformation to monoclinic martensite in NiTi under suitable thermomechanical loading conditions. It was found that the R-phase coexists both with B2 austenite and B19' monoclinic martensite. It is already significantly distorted in early stages of its formation, and the rhombohedral distortion further increases with decreasing temperature.
Trvalý link: http://hdl.handle.net/11104/0002111