Title: Effect of post-deformation annealing on the R-phase transformation temperatures in NiTi shape memory alloys
Authors: Wang, Xiebin ×
Verlinden, Bert
Van Humbeeck, Jan #
Issue Date: Jul-2015
Publisher: Elsevier Applied Science
Series Title: Intermetallics vol:62 pages:43-49
Abstract: In NiTi shape memory alloys, both the annihilation of dislocations and the formation of Ni4Ti3 precipitates may occur during post-deformation annealing. Different responses of the R-phase transformation temperatures to the annealing conditions have been reported. In order to find out the main factor(s) affecting the R-phase transformation temperatures during post-deformation annealing, a Ti- 49.8 at% Ni and a Ti-50.8 at% Ni alloy were subjected to various post-deformation annealing and thermal cycling treatments. The results show that the R-phase transformation temperatures are very stable in the Ti-49.8 at% Ni alloy, while a significant variation is observed in the Ti-50.8 at% Ni alloy with respect to the annealing and thermal cycling conditions. These findings suggest that the R-phase transformation temperatures are not susceptible to the change of dislocation density and depends mainly on the Ni concentration of the matrix, which can be modified by the formation of Ni4Ti3 precipitates.
ISSN: 0966-9795
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Surface and Interface Engineered Materials
Structural Composites and Alloys, Integrity and Nondestructive Testing
× corresponding author
# (joint) last author

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