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Phase Formation Kinetics of Titanium Aluminides Produced from Elemental Powder Mixtures

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Published/Copyright: November 9, 2021
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 88 Issue 2

Abstract

An elemental powder composite Ti-48 at.% Al was prepared by cold extrusion. The kinetics of annealing-induced phase formation at 800 °C was studied using quantitative X-ray diffraction, and the results were analyzed in terms of a one-dimensional multiphase diffusion model. During heating to 800 °C, a reaction takes place which results in a multiphase mixture containing Ti3Al, TiAl, Al2Ti and Al3Ti. Subsequent annealing at 800 °C leads to the growth of the phases TiAl and Al2Ti at the expense of Ti3Al and Al3Ti. In the competitive growth stage, the diffusion through Al2Ti is 1.4 times quicker than through TiAl. After consumption of Al3Ti, the growth of TiAl at the expense of Al2Ti and Ti3Al can be described by a classical t -law where t is the annealing time. Due to the statistical nature of the original microstructure, the final stages of TiAl growth are slowed down according to Johnson-Mehl-Avrami growth kinetics with exponent n = 0.61.

Abstract

Ein Verbundwerkstoff Ti-48 at.% Al wurde durch Kaltstrangpressen von Elementarpulvern hergestellt. Die Kinetik der Phasenbildung bei 800 °C wurde durch quantitative Röntgenanalyse untersucht, und die Ergebnisse wurden mit Hilfe eines eindimensionalen mehrphasigen Diffusionsmodells ausgewertet. Während des Aufheizens auf 800 °C findet eine Reaktion statt, bei der ein Mehrphasengemisch aus Ti3Al, TiAl, Al2Ti und Al3Ti entsteht. Weitere Wärmebehandlung bei 800 °C führt zu einem Wachstum der Phasen TiAl und Al2Ti auf Kosten von Ti3Al und Al3Ti. In dieser Phase konkurrierenden Wachstums ist die Diffusion durch Al2Ti 1,4-mal schneller als durch TiAl. Nach der Auflösung von Al3Ti kann das Wachstum von TiAl auf Kosten von Al2Ti und Ti3Al durch ein klassisches t -Gesetz beschrieben werden, wobei t die Wärmebehandlungsdauer ist. Aufgrund der statistischen Natur des Aüsgangsgefüges wird das Ende des TiAl-Wachstums gemäß der Johnson-Mehl-Avrami-Wachstumskinetik mit dem Exponenten n = 0.61 verlangsamt.

M. Dahms: Fachhochschule Flensburg, Kanzeleistraße 91–93, D-24943 Flensburg, Germany. T. J. Jewett, C. Michaelsen: GKSS Forschungszentrum Geesthacht GmbH, Max-Planck-Straße, D-21502 Geesthacht, Germany.

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Received: 1996-04-01
Published Online: 2021-11-09

© 1997 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Aufsätze
  3. Application of the Tomographic Atom Probe to Selected Problems in Materials Science
  4. Precipitation During Tempering of Chromium-rich Iron-based Martensite Alloyed with Carbon and Nitrogen
  5. Preparation, Structure and Physical Properties of Fe-, Co- and Ni-rich Melt-quenched Ribbons Containing Zr or Hf
  6. Phase Formation Kinetics of Titanium Aluminides Produced from Elemental Powder Mixtures
  7. Hydroxyapatite Coatings on TiNi Shape Memory Alloys
  8. Thermomechanical Tube Spinning of AA 2014 Aluminum Alloy
  9. Production of π-AlMgSiFe Crystals
  10. Gefügeausbildung bei der Umformung im Zweiphasengebiet
  11. Thermodynamic Evaluation of the Ti–Al–O Ternary System
  12. Thermodynamic Assessment of the Ag–Mg Binary System
  13. A Study of Thermal Properties for Fe–Ni –P–B Amorphous Nanosize Powders Prepared by Chemical Reduction
  14. Determination of Phase Equilibria in the Sm–Fe –Ti System at 600 °C
  15. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
  16. Personen
  17. Tagung
  18. Fortbildungspraktikum
  19. Buchbesprechung
  20. Terminkalender
https://doi.org/10.3139/ijmr-1997-0023

Articles in the same Issue

  1. Frontmatter
  2. Aufsätze
  3. Application of the Tomographic Atom Probe to Selected Problems in Materials Science
  4. Precipitation During Tempering of Chromium-rich Iron-based Martensite Alloyed with Carbon and Nitrogen
  5. Preparation, Structure and Physical Properties of Fe-, Co- and Ni-rich Melt-quenched Ribbons Containing Zr or Hf
  6. Phase Formation Kinetics of Titanium Aluminides Produced from Elemental Powder Mixtures
  7. Hydroxyapatite Coatings on TiNi Shape Memory Alloys
  8. Thermomechanical Tube Spinning of AA 2014 Aluminum Alloy
  9. Production of π-AlMgSiFe Crystals
  10. Gefügeausbildung bei der Umformung im Zweiphasengebiet
  11. Thermodynamic Evaluation of the Ti–Al–O Ternary System
  12. Thermodynamic Assessment of the Ag–Mg Binary System
  13. A Study of Thermal Properties for Fe–Ni –P–B Amorphous Nanosize Powders Prepared by Chemical Reduction
  14. Determination of Phase Equilibria in the Sm–Fe –Ti System at 600 °C
  15. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
  16. Personen
  17. Tagung
  18. Fortbildungspraktikum
  19. Buchbesprechung
  20. Terminkalender
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