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Strain rate dependence of the deformation mechanisms in a fully lamellar γ-TiAl-based alloy

  • Arno Bartels , Helmut Clemens EMAIL logo , Gerhard Dehm , Erhardt Lach and Wolfram Schillinger
Published/Copyright: December 27, 2021
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 93 Issue 3

Abstract

The intention of this study was to investigate the mechanical properties of an engineering γ-TiAl-based alloy with fully lamellar microstructure under quasistatic and dynamic compression at room temperature and strain rates ranging from 5.0 × 10–3 s–1 to 4.0 × 103 s–1 The microstructure of undeformed and deformed specimens was investigated by means of optical and electron microscopy. The results of the compression tests exhibit a slight strain rate sensitivity of the postyield stress. The fracture behavior of the studied γ-TiAl alloy strongly depends on the applied strain rates. Transmission electron microscopy observations conducted on deformed specimens revealed the existence of a high number of tangled ordinary dislocations, curved superdislocations and mechanical twins. The analysis of the deformation texture confirms the high activity of superdislocations and mechanical twinning during dynamic compression testing.

Keywords: γ-TiAl-based alloys; Fully lamellar microstructure; Dynamic compression tests; Deformation behaviour; Texture
Prof. Dr. Helmut Clemens Institut für Werkstoffforschung GKSS Forschungszentrum GmbH Max-Planck-Str., D-21502 Geesthacht, Germany Tel.: +49 4152 87 2502 Fax: +49 4152 87 2666

Dedicated to Professor Dr. mont. Karl Leopold Maurer on the occasion of his 75th birthday

  1. The authors A.B. and W.S. gratefully acknowledge the support of this work in the frame of the Collaborative Research Centre 371 “Micromechanics of Multiphase Materials” of the German Research Society (DFG).

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Received: 2001-12-17
Published Online: 2021-12-27

© 2002 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. Strain rate dependence of the deformation mechanisms in a fully lamellar γ-TiAl-based alloy
  4. Experimental and thermodynamic assessment of the Fe –Gd–Zr system
  5. Phase diagram of the Fe –Co –Ti system at 1073 K
  6. Copper concentration inside Guinier-Preston I zones formed in an Al –Cu alloy
  7. Identification of precipitates in 6013 aluminum alloy (Al –Mg –Si –Cu)
  8. Redistribution of phosphorus and carbon in steel weldments
  9. Microstructure and compressive properties of in situ synthesized TiC/Ti composites
  10. Effect of Al on the glass forming ability of Zr–Ni –Cu–Al alloys
  11. Fcc-hcp transformation-related internal friction in Fe –Mn alloys
  12. High-temperature stress and strain partitioning in duplex stainless steel
  13. Load sequence effects in the high cycle fatigue of two ferrite-pearlite microalloyed steels
  14. Characterization of intermetallic compounds formed during the interfacial reactions of liquid Sn and Sn– 58Bi solders with Ni substrates
  15. Notifications/Mitteilungen
  16. Personal/Personelles
https://doi.org/10.3139/ijmr-2002-0035
Keywords for this article
γ-TiAl-based alloys; Fully lamellar microstructure; Dynamic compression tests; Deformation behaviour; Texture

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. Strain rate dependence of the deformation mechanisms in a fully lamellar γ-TiAl-based alloy
  4. Experimental and thermodynamic assessment of the Fe –Gd–Zr system
  5. Phase diagram of the Fe –Co –Ti system at 1073 K
  6. Copper concentration inside Guinier-Preston I zones formed in an Al –Cu alloy
  7. Identification of precipitates in 6013 aluminum alloy (Al –Mg –Si –Cu)
  8. Redistribution of phosphorus and carbon in steel weldments
  9. Microstructure and compressive properties of in situ synthesized TiC/Ti composites
  10. Effect of Al on the glass forming ability of Zr–Ni –Cu–Al alloys
  11. Fcc-hcp transformation-related internal friction in Fe –Mn alloys
  12. High-temperature stress and strain partitioning in duplex stainless steel
  13. Load sequence effects in the high cycle fatigue of two ferrite-pearlite microalloyed steels
  14. Characterization of intermetallic compounds formed during the interfacial reactions of liquid Sn and Sn– 58Bi solders with Ni substrates
  15. Notifications/Mitteilungen
  16. Personal/Personelles
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