Influence of the Ar pressure on the structure of the NiTi foams produced by self-propagating high-temperature synthesis

Influence of the Ar pressure on the structure of the NiTi foams produced by self-propagating high-temperature synthesis

•The influence of Ar pressure in SHS chamber on the structure of NiTi foams was found.•A rise in Ar pressure changes the porous structure from isotropic to anisotropic.•A rise in Ar pressure decreases the transformation temperatures and enthalpy. The influence of the Ar pressure in the reactor on th...

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Bibliographic Details
Published in:Materials letters Vol. 299; p. 130047
Main Authors: Resnina, N., Rubanik jr, V., Rubanik, V., Kulak, M., Belyaev, S., Liulchak, P., Chepela, D., Kalganov, V.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 15-09-2021
Elsevier BV
Subjects:
Chemical precipitation
Foams
Intermetallic compounds
Martensitic transformation
Martensitic transformations
Materials science
Nickel compounds
Nickel titanides
Porous NiTi
Precipitates
Pressure
Self propagating high temperature synthesis
Transformation temperature
Wave propagation
Martensitic transformation
Self-propagating high-temperature synthesis
Porous NiTi
Pressure
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Summary:•The influence of Ar pressure in SHS chamber on the structure of NiTi foams was found.•A rise in Ar pressure changes the porous structure from isotropic to anisotropic.•A rise in Ar pressure decreases the transformation temperatures and enthalpy. The influence of the Ar pressure in the reactor on the structure and martensitic transformation of the NiTi foams produced by self-propagating high-temperature synthesis (SHS) was studied. It was shown that an increase in Ar pressure significantly affected the porous structure due to the process of combustion wave propagation changed from the stationary to the pulse regime. Regardless of the Ar pressure, the porous partitions included the NiTi phase as well as Ti2Ni, Ni3Ti2, Ni4Ti3 precipitates. An increase in Ar pressure decreased the transformation temperatures, which might be caused by an increase in the Ni concentration in the NiTi phase due to a decrease in the volume fraction of the Ni-rich precipitates.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.130047