D. A. Perminov, A. P. Druzhkov, V. L. Arbuzov

POSITRON ANNIHILATION STUDY OF THE MICROSTRUCTURAL EVOLUTION OF DEFORMED AUSTENITIC IRON-NICKEL ALLOYS

The paper studies the evolution of the imperfect structure of Fe-Ni alloys under plastic deformation and subsequent isochronal annealing by positron annihilation spectroscopy. The stages corresponding to the annealing of vacancy-type defects, the heterogeneous nucleation of Ni3Ti precipitate particles and recrystallization are determined. It is demonstrated that titanium atoms interact with vacancy defect, thus enhancing the accumulation of vacancy-type defects formed during deformation and their thermal stability. The formation of vacancy–titanium-atom mobile complexes in the process of annealing leads to the segregation of titanium at dislocations and the heterogeneous nucleation of Ni3Ti precipitate particles. These particles suppress the capture of positrons by dislocations. At the same time, this effect essentially depends on the dislocation structure present in the alloys. At temperatures exceeding 850 K, the precipitation particles coarsen due to thermally induced aging. As a result, the sensitivity of positrons to dislocations is partially restored.

Acknowledgment: The work was performed within the state assignment from FASO Russia (Spin, No. 01201463330) and partially supported by the RFBR (project No. 18-02-00270).

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