Martensitic transformation in Co-based ferromagnetic shape memory alloy

0386875 - FZÚ 2013 RIV PL eng J - Journal Article
Kopeček, Jaromír - Yokaichiya, F. - Laufek, F. - Jarošová, Markéta - Jurek, Karel - Drahokoupil, Jan - Sedláková-Ignácová, Silvia - Molnár, Peter - Heczko, Oleg
Martensitic transformation in Co-based ferromagnetic shape memory alloy.
Acta Physica Polonica A. Roč. 122, č. 3 (2012), s. 475-477. ISSN 0587-4246. E-ISSN 1898-794X.
[International Symposium on Physics of Materials, ISPMA /12./. Praha, 04.09.2011-08.09.2011]
R&D Projects: GA ČR(CZ) GA101/09/0702; GA ČR GAP107/10/0824; GA AV ČR IAA100100920
Institutional research plan: CEZ:AV0Z10100520; CEZ:AV0Z10100521
Keywords : microstructure * shape memory alloys * neutron diffraction * cobalt alloys
Subject RIV: JG - Metallurgy
Impact factor: 0.531, year: 2012

The Co38Ni33Al29 alloy in both powder and bulk state was investigated in the presented study using neutron diffraction on E9 high resolution powder diffractometer at HZB (BER II). The reverse martensitic phase transformation from the tetragonal martensitic phase into the cubic austenitic phase was observed with the phase coexistence within the temperatures from 183 K to 133 K. The fcc cobalt solid solution particles distributed in the transforming matrix remained in the same state through the whole temperature range. The obtained results agree with magnetization measurements on the same annealed sample. The powder data are compared with experiments on bulk sample, although there was a texture present. The obtained results provide further information about the phase transition process in this important class of ferromagnetic shape memory alloys.
Permanent Link: http://hdl.handle.net/11104/0216104