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

Research output: Contribution to journalArticle

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

Fingerprint

Synchrotrons
synchrotrons
Phase transitions
Chemical activation
transition temperature
activation
Radiation
radiation
synthesis
Irradiation
irradiation
Temperature
Explosions
explosions
induction heating
Powders
burning rate
heating
Induction heating
temperature

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

Cite this

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

In: Journal of Synchrotron Radiation, Vol. 26, 01.09.2019, p. 1671-1678.

Research output: Contribution to journalArticle

Loginova, Marina ; Sobachkin, Alexey ; Sitnikov, Alexander ; Yakovlev, Vladimir ; Filimonov, Valeriy ; Myasnikov, Andrey ; Sharafutdinov, Marat ; Tolochko, Boris ; Gradoboev, Alexander. / 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. In: Journal of Synchrotron Radiation. 2019 ; Vol. 26. pp. 1671-1678.
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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.",
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AU - Loginova, Marina

AU - Sobachkin, Alexey

AU - Sitnikov, Alexander

AU - Yakovlev, Vladimir

AU - Filimonov, Valeriy

AU - Myasnikov, Andrey

AU - Sharafutdinov, Marat

AU - Tolochko, Boris

AU - Gradoboev, Alexander

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AB - 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.

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