Investigation of the Precipitation Processes in NiTi Filaments

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F18%3A00325109" target="_blank" >RIV/68407700:21340/18:00325109 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1007/978-3-319-76968-4_27" target="_blank" >http://dx.doi.org/10.1007/978-3-319-76968-4_27</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/978-3-319-76968-4_27" target="_blank" >10.1007/978-3-319-76968-4_27</a>

Result language
angličtina
Original language name
Investigation of the Precipitation Processes in NiTi Filaments
Original language description
Precipitation in Ni-rich NiTi alloy is an influential process affecting material properties such as fatigue life, tensile strength or thermomechanical response. In this work, a nonconventional method of pulse heating by electric current was employed to recover cold-worked NiTi filaments (50 μm in diameter) and set the initial microstructure without precipitation. The impact of recovery processes and Ni-rich precipitates on mechanical properties can be separated to some extent, owing to the ultrafast electric current annealing. Afterwards, the NiTi filaments were subjected to an aging at 350–520 °C for 2–120 min. The aging at appropriate temperature allows a fluent and predictable adjustment of superelastic response together with an increase in tensile strength of approx. 20%. Small angle neutron scattering experiments were also performed to determine the mean size of Ni-rich precipitates. Less than 10 nm precipitates are created at 350 °C and 2 h aging, which yields a stable superelastic response and higher tensile strength. On the other hand, the filaments annealed at 520 °C show significant instability during superelastic cycling, a decrease in tensile strength and a precipitate mean size that significantly increases up to 500 nm.
Czech name
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Czech description
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Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Proceedings of the International Conference on Martensitic Transformations: Chicago
ISBN
978-3-319-76967-7
ISSN
2367-1181
e-ISSN
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Number of pages
5
Pages from-to
173-177
Publisher name
Springer
Place of publication
Basel
Event location
Hyatt Regency, Chicago, Illinois
Event date
Jul 9, 2017
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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