National Research Nuclear University “MEPhI” (Moscow, Russia)

V. P. Tyutin, Post-Graduate Student, Teaching Assistant, vp.tyutin@gmail.com
M. G. Isaenkova, Doctor of Physical and Mathematical Sciences, Professor, isamarg@mail.ru
O. A. Sadovskiy, Student, oasadovskiy@gmail.com
O. A. Krymskaya, Candidate of Physical and Mathematical Sciences, Senior Lecturer, olgakrym@inbox.ru

An approach to modeling texture formation in titanium alloys containing the hcp phase during plastic deformation is proposed using DAMASK software and taking twinning into account. The description of crystallographic slip implemented in the existing phenomenological model is supplemented by a developed algorithm for the nucleation and growth of deformation twins. Twin nucleation is implemented in accordance with the Schmid criterion and takes into account the local stress distribution, while growth is described using an energy criterion that accounts for the contribution of twin boundaries. The proposed model is verified using the experimental rolling texture of a zirconium single crystal, characterized by the same structure and lattice constant ratio c/a, and provides an excellent description of the observed fundamental patterns of crystal lattice reorientation. The model enables high-quality reproduction of the shape of twin lamella within the grain volume. The rolling texture of the VT16 polycrystalline alloy calculated using the developed model provides a good description of the observed experimental results of texture formation. At the initial stage of rolling, in grains whose basal axes are deviated from the normal direction in the sheet by an angle of more than 70 degrees, the main deformation mechanisms turned out to be twin planes {1012} and {1121}, which continue to act along with crystallographic slip until reaching 50%.

The work was carried out with the financial support of the Russian Science Foundation (project № 24-79-10289, https://rscf.ru/project/24-79-10289/).

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