Regularities in superplasticity of titanium alloys depending on their initial structure and phase composition

I.V. Ratochka, E.V. Naydenkin, I.P. Mishin, O.N. Lykova показать трудоустройства и электронную почту
Получена 16 сентября 2018; Принята 08 октября 2018;
Эта работа написана на английском языке
Цитирование: I.V. Ratochka, E.V. Naydenkin, I.P. Mishin, O.N. Lykova. Regularities in superplasticity of titanium alloys depending on their initial structure and phase composition. Письма о материалах. 2018. Т.8. №4s. С.543-548
BibTex   https://doi.org/10.22226/2410-3535-2018-4-543-548

Аннотация

Superplastic properties of titanium alloys with coarse-grained (CG) and ultrafine-frained (UFG) structureThe effect of the initial structure and phase composition on superplastic properties of pseudo α (Ti-4Al-2V), α + β (Ti-6Al-4V) and near β (Ti-5Al-5Mo-5V-1Cr-1Fe) titanium alloys was studied in temperature range 773-1223 K. It was shown that in the coarse-grained Ti-4Al-2V alloy the superplasticity is not realized in the investigated temperature range. It is assumed that this is due to the low concentration of the β stabilizing elements and difficult development of phase transformations that promote the conversion of lamellar structure into a globular one. In the case of two other alloys with a coarse-grained structure a decrease in the yield stress and an increase in elongation to failure above 150% are observed at temperatures above 1073 K. All the alloys with a fine-grained structure show superplastic flow with elongations to failure above 300 % regardless of phase composition. The formation of an ultrafine-grained structure in the alloys leads to a decrease in the temperature of the beginning of the superplastic flow realization up to 823 K independently of phase composition as compared with coarse-grained and fine-grained alloys. The β phase volume fraction and the nature of its precipitation have a significant effect on the features of development of superplastic flow and the maximum values of relative elongation to failure. This effect is apparently due to the stabilization of ultrafine-grained state by the precipitations of the β-phase along grain boundaries (Ti-6Al-4V alloy) or the formation of a micro-duplex two-phase structure (near β alloy).

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Цитирования (5)

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E. Klassman, V. Astanin. Lett. Mater. 10(1), 10 (2020). Crossref
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E. V. Naydenkin, I. V. Ratochka, O. N. Lykova, I. P. Mishin. J Mater Sci. 55(22), 9237 (2020). Crossref
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I. V. Ratochka, I. P. Mishin, O. N. Lykova, E. V. Naidenkin. Russ Phys J. 63(4), 680 (2020). Crossref
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I. V. Ratochka, E. V. Naydenkin, O. N. Lykova, I. P. Mishin. Russ Phys J. 64(12), 2193 (2022). Crossref
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I.V. Ratochka, I.P. Mishin, O.N. Lykova, E.V. Naydenkin. Materials Science and Engineering: A. 803, 140511 (2021). Crossref

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