Structure and properties of severely cold-rolled and annealed Ti–Ni shape memory alloys
| Autor: | V. Demers, S. D. Prokoshkin, E.V. Tatyanin, Sergey V. Dobatkin, Karine Inaekyan, Vladimir Brailovski, I. Yu. Khmelevskaya |
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| Rok vydání: | 2008 |
| Předmět: |
Austenite
Materials science Annealing (metallurgy) Mechanical Engineering Metallurgy technology industry and agriculture Titanium alloy Shape-memory alloy Condensed Matter Physics Nanocrystalline material Mechanics of Materials Transmission electron microscopy Substructure General Materials Science Severe plastic deformation |
| Zdroj: | Materials Science and Engineering: A. :114-118 |
| ISSN: | 0921-5093 |
| Popis: | The substructure and structure formation as well as the mechanical and functional properties of thermomechanically treated Ti–50.7 at.%Ni and Ti–50.0 at.%Ni alloys were studied using transmission electron microscopy and mechanical testing. A low-temperature thermomechanical treatment is carried out by rolling at room temperature in a true strain range e = 0.3–1.9. It is shown that the severe plastic deformation of Ti–Ni alloys results in a partial material amorphization and in the subsequent formation of a nanocrystalline austenite structure during post-deformation annealing. As a result, the completely recoverable strain and recovery stress become much higher than the values reachable using traditional low-temperature thermomechanical treatment with post-deformation annealing which creates a polygonized dislocation substructure. |
| Databáze: | OpenAIRE |
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