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Published in: Physics of Metals and Metallography 5/2022

01-05-2022 | STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION

Evolution of Phase Composition and Durometric Characteristics in the Refractory Titanium Ti–6.4Al–3.5Zr–2.6Sn–1Nb–0.6Mo–2Si Alloy under Aging

Authors: A. G. Illarionov, D. V. Gadeev, S. M. Illarionova, S. L. Demakov

Published in: Physics of Metals and Metallography | Issue 5/2022

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Abstract

The evolution of phase composition and hardness in the refractory titanium VT18U alloy (Ti–6.4Al–3.5Zr–2.6Sn–1Nb–0.6Mo–0.2Si) during aging for 1 h within a temperature range of 550–700°C has been studied by optical, scanning, and transmission electron microscopy; full-profile X-ray diffraction analysis; and durometry. An explanation is given to some specific features of changes in the crystal lattice constants (unit cell parameters) (β, α', αII, αI , and α2) calculated by means of full-profile analysis for the phases formed under high-temperature treatment at 915°C and further aging in alloy VT18U. It has been shown that a maximum hardness at 650°C in aged alloy VT18U is correlated with a maximum amount of α2-precipitates, which are formed at this temperature and detected by means of full-profile analysis. For an pilot VT18U-based alloy with an increased content of zirconium (7 wt %) and tin (4 wt %), some morphological features in the precipitation of αII and α2-phases have been established alongside with regularities of transformations due to doping with aluminum, zirconium, and tin in the phases (β, αII, αI, α2) formed during aging at 700°C for 100 h.
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Metadata
Title
Evolution of Phase Composition and Durometric Characteristics in the Refractory Titanium Ti–6.4Al–3.5Zr–2.6Sn–1Nb–0.6Mo–2Si Alloy under Aging
Authors
A. G. Illarionov
D. V. Gadeev
S. M. Illarionova
S. L. Demakov
Publication date
01-05-2022
Publisher
Pleiades Publishing
Published in
Physics of Metals and Metallography / Issue 5/2022
Print ISSN: 0031-918X
Electronic ISSN: 1555-6190
DOI
https://doi.org/10.1134/S0031918X22050040