Load-biased martensitic transformation strain of Ti50-Ni47-Co3 strip obtained by a twin-roll casting technique
| Autor: | A. Roatta, P. La Roca, Ph. Vermaut, Patrick Ochin, L. Jordan, Jorge Alberto Malarria, L. Isola |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Strain (chemistry) Mechanical Engineering Metallurgy Ti-Ni Alloy Mechanical properties Shape-memory alloy INGENIERÍAS Y TECNOLOGÍAS Condensed Matter Physics Twin-roll casting Mechanics of Materials Casting (metalworking) Diffusionless transformation Ingeniería de los Materiales General Materials Science Texture (crystalline) Texture |
| Popis: | Mechanical properties of the Ti50?Ni47?Co3 (at%) strips produced by twin-roll casting are analyzed, focusing on the maxim umrecoverable strain obtained by inducing the martensitic transformation under constant tensile load. The recoverable strain achieves a value close to 5.5 % for a load of 120MPa. The microstructure shows a typical cellular solidification structure, where the austenite grains tend to a columnar array morphology with strong {100}B2 fiber texture aligned with ND (perpendicular to the strip surface). On the basis of the measured texture, the maximum B2-B19´ transformation strain was estimated at 5.6%, usinga Sachs-type upper bound model, which averages the most favorable martensite variants in each grain, disregarding interactions between them. The agreement between the measured maximum recoverable strain and the model´s outcome is ascribed to special properties of Ti?Ni alloys, which allow them to overcome incompatibilities in shape changes of transforming grains in this particular polycrystalline environment. Fil: Isola, Lucio Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Rosario. Instituto de Física de Rosario (i); Argentina Fil: la Roca, Paulo Matías. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Rosario. Instituto de Física de Rosario (i); Argentina Fil: Roatta, A.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Rosario. Instituto de Física de Rosario (i); Argentina Fil: Vermaut, P.. Ecole Nationale Superieure de Chimie de Paris. Laboratoire de Métallurgie Structurale; Francia Fil: Jordan, L.. Ecole Nationale Superieure de Chimie de Paris. Laboratoire de Métallurgie Structurale; Francia Fil: Ochin, P.. Institut de Chimie et des Matériaux Paris; Francia Fil: Malarria, Jorge Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Rosario. Instituto de Física de Rosario (i); Argentina |
| Databáze: | OpenAIRE |
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