SEDL / STP / STP1481-EB / STP45237S

Functional Properties of Nanostructured Ti-50.0 at % Ni Alloys

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

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

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

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

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

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

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

Pages: 11    Published: Jan 2007

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Source: STP1481-EB

Abstract

Ti-50 at % Ni alloy wire is subjected to cold-rolling (true strain e=0.3–1.9) and postdeformation 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: STP45237S
Committee/Subcommittee: E08.09
DOI: 10.1520/STP45237S
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