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The Evolution of the Microstructure and System of Ti3Ni4 Particles upon Heat Treatments of a Ti−50.9 at % Ni Nanocrystalline Alloy

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Abstract

The structure of a Ti−(50.9 at % Ni) nanocrystalline alloy is studied by transmission electron microscopy after annealing at 300−500°C. It is found that B2-TiNi solid solution decomposition according to a heterogeneous mechanism with formation of Ti3Ni4 particles develops in the subgrain structure and is suppressed in nanograins. The regularities of recovery, polygonization, and recrystallization in the grain/subgrain structure of a nanocrystalline TiNi alloy are established and their interconnection with processes of dissolution and coagulation of Ti3Ni4 particles is identified.

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ACKNOWLEDGMENTS

This study was performed within the fundamental research program of the State Academies of Science for 2018–2020 (project no. 23.2.2). The structural studies were carried out in the Shared Use Center NANOTECH, Institute of Strength Physics and Material Science, Siberian Branch, Russian Academy of Sciences.

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Correspondence to T. M. Poletika.

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Translated by D. Churochkin

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Poletika, T.M., Girsova, S.L., Lotkov, A.I. et al. The Evolution of the Microstructure and System of Ti3Ni4 Particles upon Heat Treatments of a Ti−50.9 at % Ni Nanocrystalline Alloy. Tech. Phys. 64, 490–496 (2019). https://doi.org/10.1134/S1063784219040182

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  • DOI: https://doi.org/10.1134/S1063784219040182

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