Investigator: RNDr. Antonín Dlouhý, CSc.
Number of Project: 106/05/0918
Agency: Czech Science Foundation
Duration: 01. 01. 2005 - 31. 12. 2007

There are two primary research objectives: (i) to find a link between the parameters of the Ni4Ti3 phase precipitation and the characteristics of forward and reverse martensitic transformations B2-(R)-B19’ in Ni-rich NiTi shape memory alloys (SMAs) and (ii) to demonstrate that the processing technology of advanced materials (in particular melting and casting of NiTi SMAs) can be successfully transferred to and grown in the traditional industrial environment of the Czech Republic. The study of impurities (introduced during the alloy processing) and their influence on the microstructure and NiTi shape memory characteristics establishes a close link between the two main objectives of the proposed investigation.

O. Bojda, G. Eggeler, A. Dlouhý:
Scripta Materialia 53 (2005) 99-104

D. Holec, A. Dlouhý:
Zeitschrift für Metallkunde 96 (2005) 558-565

A. Kröger, S. Dziaszyk, J. Frenzel, Ch. Somsen, A. Dlouhy and G. Eggeler
Direct transmission electron microscopy observations of martensitic transformations in Ni-rich NiTi single crystals during in situ cooling and straining
Mater. Sci. Eng.A , Vols 481-482, (2008), p. 452

D. Holec, O. Bojda and A. Dlouhý
Ni4Ti3 precipitate structures in Ni-rich NiTi shape memory alloys
Mater. Sci. Eng. , Vols 481-482, (2008), p. 462

A. Dlouhý, O. Bojda, Ch. Somsen and G. Eggeler
Conventional and in-situ transmission electron microscopy investigations into multistage martensitic transformations in Ni-rich NiTi shape memory alloys
Mater. Sci. Eng. A, Vols 481-482, (2008), p. 409