Influence of Structural-Phase State on Low-Temperature Superplasticity of Ultrafine-Grained Titanium Alloys

Abstract:

The influence of the structural-phase state on the development of low-temperature superplasticity of titanium alloys with an ultrafine-grained structure and different volume fraction of the β phase was studied. It was shown that the formation of the structure by multi-directional pressing leads to a decrease in the temperature of the beginning of the superplastic flow realization up to 823K regardless of phase composition of the titanium alloys. It is assumed that the non-monotonic character of the temperature dependence of relative elongation to failure of the Ti-4Al-2V and Ti-6Al-4V alloys is related to their transition to a fine-grained state with an increase in the deformation temperature. It was established that the character and volume fraction of the β-phase precipitations have a significant effect on the grain growth and the temperature dependence of the relative elongation of the alloys to failure under conditions of superplasticity.

• Periodical: Defect and Diffusion Forum (Volume 385)
• Pages: 97-102
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.385.97
• Online since: July 2018
• Authors: Il'ya V. Ratochka, Evgeny V. Naydenkin*, Ivan P. Mishin, Olga Lykova
• Keywords: Low-Temperature Superplasticity, Severe Plastic Deformation, Titanium Alloy, Ultrafine-Grained Structure

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