Structural Changes in Co-Based F-SMA
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 the shape memory behavior. The martensitic transformation temperatures of annealed samples were about 200 K determined from magnetic measurement while as-cast sample did not exhibit any sharp transformation. All martensitic structures observed at room temperature by microscopic methods are thus stress induced. These results agree with pseudoelastic behavior observed in annealed and quenched samples.
Sergey Prokoshkin and Natalia Resnina
J. Kopeček et al., "Structural Changes in Co-Based F-SMA", Materials Science Forum, Vols. 738-739, pp. 416-420, 2013