Электронный каталог

Статья

Golovin, I.S.
Influence of Grain Size of Metastable Phases in Fe&sub(3)Ga-Type Intermetallic Compound on Their Transition to Equilibrium Structure / I.S.Golovin, A.M.Balagurov, [a.o.]. – Text : electronic // Intermetallics. – 2026. – Vol. 191. – P. 109215. – URL: https://doi.org/10.1016/j.intermet.2026.109215. – Bibliogr.: 15.

This study investigates the influence of metastable phases with D0&sub(3) and D0&sub(19) structure in Fe-27.2 at. % Ga alloy and grain size of these phases with the help of neutron diffraction, EDSD, and VSM, on the kinetics of their transition to equilibrium L1&sub(2) state, the most critical transformation for the functional properties. It has been proven that the stability of the metastable D0&sub(3) phase with high positive magnetostriction against transition to the equilibrium L1&sub(2) phase with negative magnetostriction is critically influenced by its initial grain size. Hence, we demonstrated that the D0&sub(3) *> L1&sub(2) transition kinetics is governed by nucleation at grain boundaries; reducing the D0&sub(3) grain size increases grain boundary density, drastically accelerating the transformation. If the initial state contains the non-equilibrium D0&sub(19) phase, the D0&sub(19) to L1&sub(2) transition proceeds significantly more slowly than the D0&sub(3) to L1&sub(2) transition for samples with comparable grain sizes. These results establish a direct correlation between microstructure and phase stability, revealing that the D0&sub(3) grain size is a key parameter controlling the transition rate. Our findings provide essential insights for modeling time-temperature-transformation diagrams and optimizing the functional magnetostrictive properties of Fe-Ga alloys by control of microstructure.



Спец.(статьи,препринты) = С 342 г1 - Замедление и диффузия нейтронов. Дифракция
ОИЯИ = ОИЯИ (JINR)2026