Structural changes in Co-based F-SMA

0396494 - FZÚ 2014 RIV CH eng C - Conference Paper (international conference)
Kopeček, Jaromír - Kopecký, Vít - Landa, Michal - Heczko, Oleg
Structural changes in Co-based F-SMA.
European Symposium on Martensitic Transformations. Zurich: Trans Tech Publications Ltd, 2013 - (Prokoshkin, S.; Resnina, N.), s. 416-420. Materials Science Forum, 738-739. ISSN 0255-5476.
[European Symposium on Martensitic Transformations /9./ (ESOMAT 2012). St Petersburg (RU), 09.09.2012-16.09.2012]
R&D Projects: GA ČR(CZ) GA101/09/0702; GA ČR GAP107/10/0824; GA ČR(CZ) GAP107/11/0391
Institutional support: RVO:68378271 ; RVO:61388998
Keywords : cobalt alloys * martensitic transformation * metallography * magnetic measurement * shape memory alloy
Subject RIV: BM - Solid Matter Physics ; Magnetism

The Co38Ni33Al29 alloy as a potential ferromagnetic shape memory alloy was investigated. The method of preparation of the unidirectional solidified single-crystals from cast material is described. The high-temperature annealing and subsequent quenching was found to be necessary condition for martensitic transformation and the shape memory behavior. The martensitic transformation temperatures of annealed samples were about 200 K, while as-cast sample did not exhibit any sharp transformation. The transformation temperatures were determined from magnetic measurement. All martensitic structures observed locally by microscopic methods at room temperature are thus stress induced. These results agree with pseudoelastic behavior observed in annealed and quenched samples.
Permanent Link: http://hdl.handle.net/11104/0224246