New insights into the microstructural evolution of Ti-5Al-5Mo-5V-3Cr alloy during hot working

B. Callegari, J. P. Oliveira, Rodrigo Santos Coelho, N. Schell, Pedro Paiva Brito, F. A. Soldera, F. Mücklich, M. I. Sadik, Jose Luis Garcia, Haroldo Cavalcanti Pinto

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Abstract

Microstructural features resulting from thermomechanical treatment of the β-metastable Ti-5Al-5Mo-5V-3Cr (Ti-5553) alloy were studied by means of electron backscatter diffraction and X-ray diffraction. The alloy was deformed at 950 °C (β field) and 800 °C (α + β field) with strain rates of 0.001 s 1 and 0.1 s 1 in compression mode up to a compression ratio of 0.5 (true ratio = 0.7). It was concluded that β phase undergoes dynamic recovery both above and below its β-transus temperature, and recovery is more dominant at lower strain rates, which was corroborated by EBSD misorientation measurements. Meanwhile, α phase undergoes not only a process of breakage and globularization, but also decomposition, which contributes to flow softening. The increase in strain rate caused non-uniform recovery at 950 °C and a more intense refinement of α precipitates at 800 °C. Macrotexture evaluation after deformation indicates that β's texture is much stronger than that of α, with its (200) component being the strongest one.

Original languageEnglish
Article number110180
JournalMaterials Characterization
Volume162
DOIs
Publication statusPublished - 1 Apr 2020

Keywords

  • Electron backscattered diffraction
  • Microstructure evolution
  • Synchrotron X-ray diffraction
  • Thermomechanical processing
  • Titanium alloys

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