Characterization of smart MARFOS NiTi shape memory alloys

In the present study, structural characterization of NiTi smart shape memory al-loys (SMAs), produced by an alternative powder metallurgy approach named mechanically ac-tivated reactive forging (MARFOS), was carried out by means of transmission electron micros-copy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was observed that MARFOS materials had a multiphase nanocrystalline structure. In addition, the transformation behaviour associated with the shape memory effect of the MARFOS aged mate-rials was studied with differential scanning calorimetry (DSC). Multiple-step martensitic trans-formations could be observed in aged materials.

URI

http://hdl.handle.net/10400.9/607

Citation

Neves, Filipe; Fernades, F. M. Braz; Martins, J.; Correia, J. Brito; Oliveira, M.; Gaffet, E.; Wang, T.Y.; Lattemann, M.; Suffner, J.; Hahn, H.; Characterization of smart MARFOS NiTi shape memory alloys. In: Proceedings of the IV ECCOMAS Thematic Conference on SMART STRUCTURES AND MATERIALS (SMART’09), Porto, 2009, July 13-15. Álvaro Cunha, J. Dias Rodrigues, (Eds.) Faculdade de Engenharia da Universidade do Porto, 2009, p. 469