Effect of SHS conditions on microstructure of NiTi shape memory alloy

This work aims to optimize the parameters of the SHS process for the preparation of NiTi shape memory alloy to obtain a high-purity, low-porosity material. For this purpose, high heating rate (over 300 °C min−1), temperature of 1100 °C and process duration of 20 min were determined as the optimal pa...

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Bibliographic Details
Published in:Intermetallics 2013-11, Vol.42, p.85-91
Main Authors: Novák, Pavel, Mejzlíková, Lucie, Michalcová, Alena, Čapek, Jaroslav, Beran, Přemysl, Vojtěch, Dalibor
Format: Article
Language:English
Subjects:
A. Intermetallics, miscellaneous
Admixtures
B. Phase identification
C. Reaction synthesis
F. Diffraction
F. Electron microscopy, scanning
Intermetallic compounds
Intermetallics
Nickel base alloys
Nickel compounds
Nickel titanides
Self-propagating synthesis
Shape memory alloys
Titanium compounds
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Summary:This work aims to optimize the parameters of the SHS process for the preparation of NiTi shape memory alloy to obtain a high-purity, low-porosity material. For this purpose, high heating rate (over 300 °C min−1), temperature of 1100 °C and process duration of 20 min were determined as the optimal parameters. To prevent nickel depletion of the product and to minimize the porosity, the use of coarse titanium particles (200–600 μm) with fresh surface can be recommended. SHS products were composed of NiTi with the admixture of Ti2Ni phase. The formation of this phase cannot be fully avoided in SHS preparation route. [Display omitted] •Conditions of SHS for preparation of low-porosity NiTi were determined.•Rapid heating and use of coarse particles can be recommended.•Product contains NiTi and Ti2Ni phases.
ISSN:0966-9795
DOI:10.1016/j.intermet.2013.05.015