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Formation of Intermediate Phases in Decomposition of Metastable B-Phase in Titanium Alloys of Transition Class

The process of precipitation of transition phases in quenched alloys Ti – 14% Mo and VST3553 is studied under aging at from 300 to 500°C. X-ray diffraction phase analysis and transmission electron microscopy are used to detect the presence of a metastable O″-phase in the alloys quenched from the β-range. The morphology of the precipitated particles and the kinetics of formation of the O″-phase are determined. It is shown that phases O′ and/or O″ are continuously associated with precipitation of phase ω and are transition phases up to the temperature of formation of the α-phase, i.e., 500°C.

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The work has been performed within a state assignment of the Ministry of Science and Higher Education of the Russian Federation (topic No. 0836-2020-0020).

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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 27 – 32, August, 2022.

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Petrova, A.O., Popov, A.A., Lugovaya, K.I. et al. Formation of Intermediate Phases in Decomposition of Metastable B-Phase in Titanium Alloys of Transition Class. Met Sci Heat Treat 64, 446–450 (2022).

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Key words

  • titanium alloy
  • heat treatment
  • processes of decomposition of metastable phases
  • transition phases
  • microstructure