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Title: Effect of nanoprecipitates on the transformation behavior and functional properties of a Ti–50.8 at.% Ni alloy with micron-sized grains
Authors: Wang, Xiebin
Kustov, Sergey
Li, Kai
Schryvers, Dominique
Verlinden, Bert
Van Humbeeck, Jan # ×
Issue Date: Jan-2015
Publisher: Elsevier Science
Series Title: Acta Materialia vol:82 pages:224-233
Abstract: In order to take advantage of both grain refinement and precipitation hardening effects, nanoscaled Ni4Ti3 precipitates are introduced in a Ti–50.8 at.% Ni alloy with micron-sized grains (average grain size of 1.7 µm). Calorimetry, electrical resistance studies and thermomechanical tests were employed to study the transformation behavior and functional properties in relation to the obtained microstructure. A significant suppression of martensite transformation by the obtained microstructure is observed. The thermomechanical tests show that the advantageous properties of both grain refinement and precipitation hardening are combined in the developed materials, resulting in superior shape memory characteristics and stability of pseudoelasticity. It is concluded that introducing nanoscaled Ni4Ti3 precipitates into small grains is a new approach to improve the functional properties of NiTi shape memory alloys.
ISSN: 1359-6454
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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