ISSN: 1546-962X
Published Online: 5 April 2006
Page Count: 11

Functional Properties of Nanostructured Ti-50.0 at % Ni Alloys
Demers, V
Ph.D. Student, Professor, and Ms. Eng. Student, Ecole de Technologie Superieure, Quebec

Brailovski, V
Ph.D. Student, Professor, and Ms. Eng. Student, Ecole de Technologie Superieure, Quebec

Prokoshkin, S
Professor, Ph.D. Student, and Researcher, Moscow State Institute of Steel and Alloys,

Inaekyan, K
Professor, Ph.D. Student, and Researcher, Moscow State Institute of Steel and Alloys,

Bastarash, E
Ph.D. Student, Professor, and Ms. Eng. Student, Ecole de Technologie Superieure, Quebec

Khmelevskaya, I
Professor, Ph.D. Student, and Researcher, Moscow State Institute of Steel and Alloys,

Dobatkin, S
Professor, Baikov Institute of Metallurgy and Material Science of RAS,

(Received 2 February 2006; accepted 20 March 2006)

Abstract

Ti-50 at % Ni alloy wire is subjected to cold-rolling (true strain e=0.3-1.9) and post-deformation annealing (200–700°C range). For all levels of cold work, the maxima of recovery strain and stress are obtained after annealing in the 350–400°C range. For the moderately-to-high cold-worked material (e=0.3-0.88), this annealing leads to polygonization, while for the severely cold-worked one (e=1.9), to the material nanocrystallization (grains of 50–80 nm in size). Nanocrystallized alloy generates 30 % higher recovery stresses (up to 1450 MPa) and 10% higher completely recoverable strains (more than 8 %) as compared to the polygonized alloy, while having comparable mechanical properties in tension.

Keywords:
nickel-titanium shape memory alloys, nanocrystalline structure, severe plastic deformation, post-deformation annealing

Paper ID: JAI100383
DOI: 10.1520/JAI100383
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