Decomposition processes of the metastable β-phase in titanium alloys of the transition class

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Resumo

The structural and phase transformations occurring during the decomposition of a metastable β-solid solution upon aging in titanium alloys of transition class Ti–4Mo and VST3553 (Ti–Al–V–5Mo–Cr) have been analyzed. The phases formed during aging, the morphology, and temperature ranges of their precipitation have been determined by structural analysis methods. The formation of an athermal ω-phase during quenching and its subsequent dissolution during heating have been shown; the formation of a transient metastable Oʹʹ-phase, which is intermediate in the β → ωiso → α-transformation, has been established; and the precipitation of the Oʹʹ-phase has been recorded in the presence of an isothermal ω-phase in the structure.

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Sobre autores

А. Popov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: a.o.petrova@urfu.ru
Rússia, Ekaterinburg; Ekaterinburg

А. Petгova

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University named after the First President of Russia B. N. Yeltsin

Autor responsável pela correspondência
Email: a.o.petrova@urfu.ru
Rússia, Ekaterinburg; Ekaterinburg

I. Narigina

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: a.o.petrova@urfu.ru
Rússia, Ekaterinburg

N. Popov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: a.o.petrova@urfu.ru
Rússia, Ekaterinburg; Ekaterinburg

R. Petrov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: a.o.petrova@urfu.ru
Rússia, Ekaterinburg; Ekaterinburg

К. Lugovaya

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: a.o.petrova@urfu.ru
Rússia, Ekaterinburg; Ekaterinburg

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2. Fig. 1. Sections of diffraction patterns of VST3553 (a) and Ti–14Mo (b) alloys after quenching.

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3. Fig. 2. Electron diffraction patterns of VST3553 (a) and Ti–14Mo (b) alloys in the quenched state.

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4. Fig. 3. Heating thermograms of hardened alloys VST3553 (a) and Ti–14Mo (b).

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5. Fig. 4. Sections of diffraction patterns of VST3553 (a) and Ti–14Mo (b) alloys quenched and aged at different temperatures.

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6. Fig. 5. Change in the crystal lattice period of the βm phase in VST3553 (a) and Ti–14Mo (b) alloys after quenching and aging at different temperatures.

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7. Fig. 6. Dark-field images of the microstructure in the reflections [021]ω (a), [002]Oʹʹ (b) and [010]α (c) of the VST3553 alloy after quenching and aging at 350°C (TEM).

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8. Fig. 7. Microhardness of VST3553 (a) and Ti–14Mo (b) alloys after quenching and aging at different temperatures.

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