Synchrotron in situ studies of mechanical activation treatment and γ-radiation impact on structural-phase transitions and high-temperature synthesis parameters during the formation of γ-(TiAl) compound

Marina Loginova, Alexey Sobachkin, Alexander Sitnikov, Vladimir Yakovlev, Valeriy Filimonov, Andrey Myasnikov, Marat Sharafutdinov, Boris Tolochko, Alexander Gradoboev

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Abstract

In situ synchrotron studies of structure and phase formation dynamics in mechanically activated (t = 7 min, power density 40 g) and mechanically activated with subsequent irradiation by γ-quanta 60 Co powder mixture (Ti 64 wt% + Al) during high-temperature synthesis by the method of thermal explosion using induction heating are described. In situ high-temperature synthesis was carried out on the created experimental complex adapted for synchrotron X-ray diffraction methods. The sequence of formation and time-temperature interval of the metastable and main phases were determined. The impact of preliminary mechanical activation and of γ-irradiation on the macrokinetic parameters of the synthesis were studied experimentally in situ. It has been established that the impact of γ-irradiation on the mechanically activated powder mixture of the composition Ti 64 wt% + Al leads to a change in the thermal parameters of combustion: the maximum synthesis temperature and the burning rate decrease. The heating rate for the non-irradiated mixture is 204.8 K s -1 and that for the irradiated mixture is 81.6 K s -1. The dependences of mass fractions of the synthesized compounds on time and temperature were calculated from the stage of preheating until completion of the thermal explosion. A single-phase equilibrium product of the composition γ-(TiAl) is formed in γ-irradiated mechanically activated mixture when the system reaches maximum temperature. The synthesized product of the mechanically activated mixture without γ-irradiation contains 72% γ-(TiAl); TiAl 3 (26%) and residual Ti (2%) are also observed.

Original languageEnglish
Pages (from-to)1671-1678
Number of pages8
JournalJournal of Synchrotron Radiation
Volume26
DOIs
Publication statusPublished - 1 Sep 2019

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Keywords

  • experimental complex
  • high-temperature synthesis
  • induction heating
  • mechanoactivation processing
  • phase formation
  • powder materials
  • structure formation
  • thermal explosion
  • titanium aluminides
  • γ-irradiation

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation

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