Transformation of the TiNi Alloy Microstructure and the Mechanical Properties Caused by Repeated B2-B19′ Martensitic Transformations |
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Authors: | Anna Churakova Dmitry Gunderov Alexander Lukyanov Niklas Nollmann |
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Affiliation: | 1. Institute of Molecule and Crystal Physics RAS, 151 pr.Oktyabrya, Ufa 450075, Russia;2. Ufa State Aviation Technical University, 12 K. Marx street, Ufa 450000, Russia;3. Institute of Materials Physics, University of Münster, Wilhelm-Klemm Street10, 48149 Münster, Germany |
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Abstract: | The influences of thermal cycling treatment in the temperature range of B2-B19 martensitic transformations (-150 to 150 °C) on the TiNi alloy structure and properties were studied. Different states named the initial coarse-grained (CG) state, the ultrafine-grained (UFG) state after ECAP (with a grain size of 200 nm), the state after ECAP and cold upsetting by 30% were considered. The results show that the microhardness and the strength increase in all the three states. According to the XRD analysis, a more significant increment in the dislocation density, resulting from thermal cycling, is observed in the UFG alloy than in the CG alloy. |
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Keywords: | Thermal cycling TiNi alloy Equal-channel angular pressing Martensitic transformation |
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