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Physical metallurgy of high Nb-containing TiAl alloys

  • Fritz Appel EMAIL logo , Jonathan D. H. Paul , Michael Oehring , Helmut Clemens and Franz Dieter Fischer
Published/Copyright: February 8, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 95 Issue 7

Abstract

Intermetallic titanium aluminides exhibit attractive thermophysical properties, which give them the potential for extensive use as lightweight structural components. Novel design concepts are based on alloys with the general composition (in at.%) Ti-45Al-(5–10) Nb, which were subjected to precipitation hardening. Optimized compositions have been identified that are capable of carrying stresses in excess of 700 MPa at service temperatures of 700 °C and have superior creep properties. The alloys exhibit at room temperature yield stresses in excess of 1GPa combined with plastic tensile elongations of about 2%. Wrought alloys of this type can be an attractive alternative to the nickel-base superalloys in certain ranges of stress and temperature. The future and promise of these new TiAl alloys lies in innovative processing methods designed to achieve better performance.

Keywords: Titanium aluminides; Nb solute; Precipitation hardening; Hot-working; Strength
Dr. F. Appel Institute for Materials Research GKSS Research Centre Geesthacht D-21502 Geesthacht, Germany Tel.: +49 4152 87 2504 Fax: +49 4152 87 2534

Dedicated to Professor Dr. Dr. h. c. Franz Jeglitsch on the occasion of his 70th birthday

  1. The authors acknowledge continuous support from Ms. E. Tretau, C. Buque, U. Fröbel, U. Lorenz, and J. Müllauer. The financial support of this research by Niobium Products Company GmbH, Düsseldorf is gratefully acknowledged.

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Received: 2004-03-01
Accepted: 2004-04-05
Published Online: 2022-02-08

© 2004 Carl Hanser Verlag, München

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  2. Editorial
  3. 50 Jahre Metallkunde-Kolloquium am Arlberg
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  6. Mechanical model for the deformation of the wood cell wall
  7. Physical metallurgy of high Nb-containing TiAl alloys
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  20. Notifications/Mitteilungen
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https://doi.org/10.1515/ijmr-2004-0113
Keywords for this article
Titanium aluminides; Nb solute; Precipitation hardening; Hot-working; Strength

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. 50 Jahre Metallkunde-Kolloquium am Arlberg
  4. Articles Basic
  5. Microstructure and mechanical properties of Si and YN doped powder metallurgical tantalum
  6. Mechanical model for the deformation of the wood cell wall
  7. Physical metallurgy of high Nb-containing TiAl alloys
  8. Phase and microstructure selection in peritectic alloys under high G-V ratio
  9. Austenitic stainless steels of high strength and ductility
  10. Articles Applied
  11. Charakterisierung von Dual-Phasen- und TRIP-Stählen mittels Nanohärte und Röntgendiffraktometrie
  12. Mechanische Zuverlässigkeit von keramischen Kaltleiterbauelementen – Möglichkeiten zur Verbesserung
  13. Physical and materials aspects of photonic crystals for microwaves and millimetre waves
  14. In-situ investigation of strain relaxation in an Al/Si–MMC using high energy synchrotron radiation
  15. Sigma-phase in duplex-stainless steels
  16. Evolution of texture in Alloy 80A during initial ingot breakdown
  17. Characterisation of precipitates in a stainless maraging steel by three-dimensional atom probe and small-angle neutron scattering
  18. Modifikation von Titanlegierungen für medizinische Anwendungen
  19. Residual stresses in forged IN718 turbine discs
  20. Notifications/Mitteilungen
  21. Personal/Personelles
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