Cobalt-based ferromagnetic shape memory alloys

0364034 - FZÚ 2012 CN eng A - Abstract
Kopeček, Jaromír - Jarošová, Markéta - Drahokoupil, Jan - Majtás, Dušan - Kratochvílová, Irena - Heczko, Oleg
Cobalt-based ferromagnetic shape memory alloys.
The 16th International Conference on Crystal Growth (ICCG-16). Beijing: Chinese Association for Crystal Growth, 2010 - (Jiang, M.; Chen, C.). GM2. ISBN N.
[International Conference on Crystal Growth /16./ (ICCG-16). 08.08.2010-13. 08.2010, Beijing]
R&D Projects: GA ČR(CZ) GA101/09/0702; GA ČR GAP107/10/0824
Institutional research plan: CEZ:AV0Z10100520
Keywords : shape memory alloys * crystal growth * SBSD method * metallography
Subject RIV: BM - Solid Matter Physics ; Magnetism
http://210.72.154.189/Prelim_Abstract_Display.php?EID=1757

Magnetic shape memory effect is studied in the various Ni-Mn-Ga compounds mainly, but number of alloys combining martensitic and ferromagnetic transformation is higher. Among them Co-Ni-Al compounds have very interesting mechanical properties as high strengths and partially better resistance to cracking. Compare to Ni-Mn-Ga system the high-temperature state of Co-Ni-Al is complicated, there exist two phases: transformable, ordered (Co,Ni)Al and non-transformable precipitates of cubic cobalt solid solution. Other phase can be presented as well under selected condition. The preparation of the transformable “single-crystal” covers the preparation of single-crystalline matrix with the homogeneous fcc-cobalt precipitates distribution and subsequent annealing and quenching, which creates the metastable matrix state with nucleated precipitates arrays supporting the transformation under external stress.
Permanent Link: http://hdl.handle.net/11104/0199619