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

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 Ti 3 Ni 4 particles develops in the subgrain structur...

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Bibliographic Details
Published in:Technical physics 2019-04, Vol.64 (4), p.490-496
Main Authors: Poletika, T. M., Girsova, S. L., Lotkov, A. I., Krukovskii, K. V.
Format: Article
Language:English
Subjects:
Classical and Continuum Physics
Coagulation
Crystals
Intermetallic compounds
Nanoalloys
Nanocrystals
Nickel base alloys
Nickel compounds
Physics
Physics and Astronomy
Polygonization
Recrystallization
Shape memory alloys
Solid solutions
Solid State
Titanium compounds
Transmission electron microscopy
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Summary: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 Ti 3 Ni 4 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 Ti 3 Ni 4 particles is identified.
ISSN:1063-7842
1090-6525
DOI:10.1134/S1063784219040182