| Developers: | NITU MISIS (National University of Science and Technology) |
| Date of the premiere of the system: | 2021/01/21 |
| Branches: | Pharmaceutics, medicine, health care |
2021: Method of thermomechanical processing of a nikelid of titanium
On January 21, 2021 NITU "MISIS" announced that scientists of the university could improve technology of receiving medical shape memory alloys in cooperation with the Russian and foreign colleagues. The offered technique, as expected, will allow to increase reliability of the existing surgical devices and to develop a number of new. Results of a research are published in the JOM magazine.
Shape memory alloys (SPF) are the materials capable to recover the form after serious deformations. The intermetallic SPF on the basis of Ti-Ni (titanium-nickel) applied in implants and "smart" medical devices with high requirements to reliability – such as the self-extracted surgical brackets or vascular stents for a heart surgery are most widely used.
The maximum indicators of reversible deformation at Ti-Ni alloy can be received for the account of formation of ultrafine-grained structure by thermomechanical processing at a temperature not above 600 °C. However modern production technologies of a nikelid of titanium as scientists reported, assume melting and processing at temperatures from 800 to 900 °C that does not allow to receive massive procurements of SPF with ultrafine-grained structure.
Specialists of NITU "MISIS" for the first time found parameters of thermomechanical processing of a nikelid of titanium which will allow to receive massive products from SPF not only with necessary nanostructure, but also the increased functional properties.
 | "We showed that deformation temperature in 300 °C is boundary for transition from low-temperature type of charts of deformation to high-temperature. The highest characteristics of a formovosstanovleniye with dynamically poligonizovanny structure are implemented after deformation at 300-600 °C. This interval of processing is most perspective for formation of ultrafine-grained structure and increase in functional properties of Ti-Ni alloy" — the research associate of Ultrafine-grained Metal Materials laboratory of NITU "MISIS" Victor Komarov told. |  |
Use of a nikelid of the titanium nanostructured on the offered technology as scientists explained will allow to reduce significantly metal consumption and to increase reliability of devices on the basis of a shape memory effect.
During the research scientific NITU "MISIS" for the first time received charts of deformation and studied structure formation of SPF at temperatures below 600 °C, the most perspective for formation of nanostructures. According to scientists, the analysis of data retrieveds allowed to determine also temperature ranges of dynamic processes of return, a poligonization and recrystallization of SPF.
Staff of Institute of metallurgy and materials science of Baykov of RAS and the Technical university "Freiberg Mountain Academy" (TUBAF, Germany) participated in a research. Research team will continue development of recommendations about thermomechanical processing of SPF Ti-Ni in industrial conditions.
Developers predict that Ti-Ni alloy with ultramelkozernisty structure and the improved functional properties will allow to create the next generation of medical devices on the basis of a shape memory effect.
| The site content is translated by machine translation software powered by PROMT. The machine-translated articles are not always perfect and may contain errors in vocabulary, syntax or grammar. Read original article If you find inaccuracies or errors in the results of machine translation, please write to editor@tadviser.ru. We will make every effort to correct them as soon as possible. |