DECOMPOSITION OF THE METASTABLE BETA PHASE IN HIGH-STRENGTH TITANIUM ALLOYS VST5553, Ti–10V–2Fe–3Al, and BETA-21S

M. S. Kalienko; Калиенко М. С.; A. V, Zhelnina; Желнина А. В.; A. A. Popov; Попов А. А.

doi:10.31857/S0015323023601198

DECOMPOSITION OF THE METASTABLE BETA PHASE IN HIGH-STRENGTH TITANIUM ALLOYS VST5553, Ti–10V–2Fe–3Al, and BETA-21S

Authors: Kalienko M.S.¹^,2, Zhelnina A.V.¹^,2, Popov A.A.¹^,2^,3
Affiliations:
1. Public Stock Company "VSMPO-AVISMA Corporation"
2. Ural Federal University
3. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Issue: Vol 124, No 9 (2023)
Pages: 854-860
Section: СТРУКТУРА, ФАЗОВЫЕ ПРЕВРАЩЕНИЯ И ДИФФУЗИЯ
URL: https://rjonco.com/0015-3230/article/view/663000
DOI: https://doi.org/10.31857/S0015323023601198
EDN: https://elibrary.ru/YYTIKR
ID: 663000

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Abstract

In this paper the decomposition and evolution of microstructures of the metastable β-phase during aging of Ti10V2Fe3Al, VST5553, and Beta-21S alloys were studied. A comparative study of the evolution of the microstructure and crystal lattice of phases in alloys during aging has been carried out. Features of the nucleation and growth of the secondary α-phase formed during aging were observed using scanning electron microscopy. The concomitant diffusion redistribution of alloying elements between the phases was studied using the method of full-profile X-ray diffraction analysis. It has been established that during aging, the change in the periods of crystal lattices in the studied alloys has a general pattern, which is associated with the common nature of the process of diffusion redistribution of alloying elements between phases. The morphology formed during the decomposition of the secondary α-phase differs between alloys and is determined by the stability of the β-phase after quenching.

Keywords

titanium alloy, diffusion, XRD, crystal lattice, hardening heat treatment

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