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Microstructure Characterization of Intermetallic γ-TiAl Based Alloys after High-Temperature Deformation

Presented at the Metallography Conference 2014 in Leoben, Austria
  • F. Godor , R. Werner , J. Lindemann , H. Clemens and S. Mayer
Published/Copyright: May 1, 2015
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Practical Metallography
From the journal Practical Metallography Volume 52 Issue 5

Abstract

In this contribution, the microstructure of two intermetallic γ-TiAl-based alloys with different Al contents were examined after high-temperature deformation. To investigate the dynamic recrystallization of these alloys, isothermal compression tests were performed using a Gleeble® 3500 simulator. For the experiments, a temperature range of 1 150 °C to 1 300 °C and strain rates of 0.005 s−1, 0.05 s−1 and 0.5 s−1 were applied, up to a true strain of 0.9. The deformed microstructural states, particularly the multiphase alloys' dynamically recrystallized grain sizes were characterized via Scanning Electronic Microscopy (SEM) and Electron Back Scatter Diffraction (EBSD). The recrystallized grain sizes obtained from the experiments could be linked with the calculated Zener-Hollomon parameter through a power law.

Kurzfassung

In der vorliegenden Arbeit wurde das Gefüge zweier intermetallischer γ-TiAl-Basislegierungen, welche sich in der chemischen Zusammensetzung im Al-Gehalt unterscheiden, nach Hochtemperaturverformung analysiert. Zur Untersuchung des dynamischen Rekristallisationsverhaltens dieser Legierungen wurden isotherme Umformversuche an einem Gleeble® 3500-Simulator durchgeführt. Die Experimente erfolgten im Temperaturbereich von 1 150 °C bis 1 300 °C mit Dehnraten von 0.005 s−1, 0.05 s−1 und 0.5 s−1 bis zu einer wahren Dehnung von 0.9. Die verformten Gefügezustände, insbesondere die dynamisch rekristallisierten Korngrößen der mehrphasigen Legierungen, wurden mittels Rasterelektronenmikroskopie (REM) und Rückstreuelektronenbeugung (engl. Electron Backscatter Diffraction, EBSD) charakterisiert. Die aus den Versuchen erhaltenen rekristallisierten Korngrößen konnten mit dem aus einer Simulation berechneten Zener-Hollomon-Parameter über ein Potenzgesetz verknüpft werden.

Translation: M. Lackas

References / Literatur

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Published Online: 2015-05-01
Published in Print: 2015-05-15

© 2015, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Microstructure Characterization of Intermetallic γ-TiAl Based Alloys after High-Temperature Deformation
  7. Influence of Discontinuous Precipitation on the Creep Behavior of a β-Solidified γ-TiAl Based Alloy
  8. High Temperature Laser-Scanning Confocal Microscopy for the in-situ Investigation of Grain Growth and Phase Transformations in Intermetallic γ-TiAl based Alloys
  9. Metallurgical Failure Investigation of Quench Cracking in Hexagonal Bolt Head Fasteners
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
https://doi.org/10.3139/147.110338

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Microstructure Characterization of Intermetallic γ-TiAl Based Alloys after High-Temperature Deformation
  7. Influence of Discontinuous Precipitation on the Creep Behavior of a β-Solidified γ-TiAl Based Alloy
  8. High Temperature Laser-Scanning Confocal Microscopy for the in-situ Investigation of Grain Growth and Phase Transformations in Intermetallic γ-TiAl based Alloys
  9. Metallurgical Failure Investigation of Quench Cracking in Hexagonal Bolt Head Fasteners
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
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