Neutron investigation of Nitinol stents and massive samples before and after PIRAC coating

0535379 - ÚJF 2021 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Rogante, M. - Buhagiar, J. - Cassar, G. - Debono, M. - Lebedev, V. - Mikula, Pavol - Ryukhtin, Vasil
Neutron investigation of Nitinol stents and massive samples before and after PIRAC coating.
Procedia Structural Integrity. Vol. 23. Brno: Elsevier, 2019 - (Pokluda, J.; Šandera, P.), s. 95-100. ISSN 2452-3216.
[9th International Conference on Materials Structure and Micromechanics of Fracture (MSFM 2019). Brno (CZ), 26.06.2019-28.06.2019]
Grant CEP: GA MŠMT LM2015056
Institucionální podpora: RVO:61389005
Klíčová slova: high-resolution neutron diffraction * nanostructure * Nitinol * SANS
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

Nitinol, a thermoelastic Ni-Ti Shape Memory Alloy (SMA) with approximately 50 at. % Ti, is adopted in a wide range of medical equipment and devices used in interventional radiology, orthopaedics, neurology and cardiology, in particular as a smart material for stents. In this work, NiTi real stents and massive samples before and after different Powder Immersion Reaction Assisted Coating (PIRAC) treatments have been investigated by using two neutron techniques: (1) Small and Ultra-Small Angle Neutron Scattering (SANS, USANS) for nano- and micro-scale characterization, obtaining information on structure and the effects due to the coating treatment, and (2) High-Resolution Neutron Diffraction (HRND), evaluating the macrostrain components resulting from angular shifts of diffraction peaks and the micro-strains in the plastically deformation region by means of profile-broadening analysis. The obtained results contribute: improving knowledge of defects and other key features of the materials complementary to those achieved by using traditional examination techniques. helping to better understand the functional characteristics of Nitinol parts and predict the material's mechanical behaviour.
Trvalý link: http://hdl.handle.net/11104/0314152