Creep Behavior of High‐Nb TiAl Alloy at 800–900 °C by Directional Solidification

Creep Behavior of High‐Nb TiAl Alloy at 800–900 °C by Directional Solidification IntroductionTitanium aluminum alloy based on the intermetallic gamma phase has been considered as lightweight materials for high‐temperature applications in the aerospace and automotive industries, which may replace the high‐density nickel‐base superalloys at intended service temperature of 600–900 °C. The appropriate additions of metallic (Nb, Cr, V, Mn) alloying elements in TiAl‐based alloys can further improve the mechanical properties, creep resistance, and oxidation resistance by solid solution and precipitation hardening. In particular, high Nb‐containing TiAl alloys have attracted significant attention due to their excellent high‐temperature properties and oxidation resistance. The current application of so‐called TNM alloy, with nominal composition of Ti–43.5Al–4Nb–1Mo–0.1B (all chemical compositions are given in at%, except in the special illustration) and Ti–48Al–2Cr–2Nb provided the good strength and creep properties up to 750 °C. However, the current studies about creep behavior of TiAl alloy mainly focus on the creep temperature of 700–800 °C. It is essential to study the creep behavior of high‐Nb TiAl alloy at intended service temperature of 800–900 °C for further improving its application temperature.In TiAl alloys, the degradation of microstructure usually occurs at intermediate temperatures during creep, typically at 800–900 °C, and the discontinuous coarsening of lamellar structure also occurs during creep. The microstructural stability strongly depends on the http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Engineering Materials Wiley

Creep Behavior of High‐Nb TiAl Alloy at 800–900 °C by Directional Solidification

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Publisher
Wiley Subscription Services, Inc., A Wiley Company
Copyright
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
1438-1656
eISSN
1527-2648
D.O.I.
10.1002/adem.201700734
Publisher site
See Article on Publisher Site

Abstract

IntroductionTitanium aluminum alloy based on the intermetallic gamma phase has been considered as lightweight materials for high‐temperature applications in the aerospace and automotive industries, which may replace the high‐density nickel‐base superalloys at intended service temperature of 600–900 °C. The appropriate additions of metallic (Nb, Cr, V, Mn) alloying elements in TiAl‐based alloys can further improve the mechanical properties, creep resistance, and oxidation resistance by solid solution and precipitation hardening. In particular, high Nb‐containing TiAl alloys have attracted significant attention due to their excellent high‐temperature properties and oxidation resistance. The current application of so‐called TNM alloy, with nominal composition of Ti–43.5Al–4Nb–1Mo–0.1B (all chemical compositions are given in at%, except in the special illustration) and Ti–48Al–2Cr–2Nb provided the good strength and creep properties up to 750 °C. However, the current studies about creep behavior of TiAl alloy mainly focus on the creep temperature of 700–800 °C. It is essential to study the creep behavior of high‐Nb TiAl alloy at intended service temperature of 800–900 °C for further improving its application temperature.In TiAl alloys, the degradation of microstructure usually occurs at intermediate temperatures during creep, typically at 800–900 °C, and the discontinuous coarsening of lamellar structure also occurs during creep. The microstructural stability strongly depends on the

Journal

Advanced Engineering MaterialsWiley

Published: Jan 1, 2018

Keywords: ; ; ; ;

References

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