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 show affiliations and emails
Received: 16 September 2018; Revised: 27 September 2018; Accepted: 08 October 2018
Citation: 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. Lett. Mater., 2018, 8(4s) 543-548
BibTex   https://doi.org/10.22226/2410-3535-2018-4-543-548

Abstract

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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