Superplastic deformation behavior of ultra-fine-grained Ti-1V-4Al-3Mo alloy: constitutive modeling and processing map

A O Mosleh, A V Mikhaylovskaya, A D Kotov, M Sitkina, P Mestre-Rinn, J S Kwame

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Abstract

This paper studies the superplasticity of conventional sheets of Ti-1V-4Al-3Mo (α+β) alloy. The flow behavior was investigated in a temperature range of 775 °C–900 °C and a constant strain rate range of 2×10−4–5×10−3 s−1 via uniaxial tensile tests. The microstructure evolution during the superplastic deformation was analyzed. The results revealed that, the flow behavior of Ti-1V-4Al- 3Mo (α+β) alloy is characterized by strain softening phenomena. The experimental stress-strain data were used to build a power law constitutive model. A processing map, which shows the safe and unsafe regions of deformation, was also constructed for the studied alloy. The optimal deformation regime was attained at a temperature of 875 °C and strain rate of 1×10−3 s−1 which provided a β phase fraction of 52%. Equiaxed fine-grained α and β structure with size of 2–3 μm as well as dislocation activity inside the α-grains were identified in the optimum deformation regime.
Original languageEnglish
Article number9
Pages (from-to)1-9
Number of pages9
JournalMaterials Research Express
Volume6
Issue number9
DOIs
Publication statusPublished - 19 Jul 2019

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Keywords

  • constitutive modeling
  • titanium alloy
  • activation energy
  • superplasticity
  • processing maps

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