Effect of Nb on phase transformations and microstructure in high Nb titanium aluminides

Glenn E. Bean; Michael S. Kesler; Michele V. Manuel

doi:10.1016/j.jallcom.2014.05.092

Effect of Nb on phase transformations and microstructure in high Nb titanium aluminides

Glenn E. Bean, Michael S. Kesler, Michele V. Manuel

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Titanium aluminides are of interest due to their high specific strength and performance up to 750 °C. Research into high-Nb γ-TiAl based titanium aluminides has shown promising improvements in performance by introduction of the σ-Nb₂Al phase. However, one current challenge is improving mechanical properties at room and elevated temperatures in order to enable their further implementation. These properties are closely tied with microstructural refinement, and thus phase evolution and microstructural development is the focus of this work. Phase transformation temperatures and stability ranges were determined experimentally through DSC analysis of arc melted alloys, then compared with predictions based upon computational models, and investigated through heat treatment of experimental alloys to develop an ultrafine γ + σ microstructure.

Original language	English
Pages (from-to)	351-356
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	613
DOIs	https://doi.org/10.1016/j.jallcom.2014.05.092
State	Published - Nov 15 2014
Externally published	Yes

Funding

The authors would like to gratefully acknowledge the support by the National Science Foundation (NSF) under grant number DMR-0856622 . We would also like to thank Dr. Hans Seifert at the Karlsruhe Institute of Technology for providing the computational thermodynamic databases utilized in this study.

Keywords

Intermetallics
Microstructure development
Precipitation
Thermodynamic properties
Titanium aluminides

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10.1016/j.jallcom.2014.05.092

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abstract = "Titanium aluminides are of interest due to their high specific strength and performance up to 750 °C. Research into high-Nb γ-TiAl based titanium aluminides has shown promising improvements in performance by introduction of the σ-Nb2Al phase. However, one current challenge is improving mechanical properties at room and elevated temperatures in order to enable their further implementation. These properties are closely tied with microstructural refinement, and thus phase evolution and microstructural development is the focus of this work. Phase transformation temperatures and stability ranges were determined experimentally through DSC analysis of arc melted alloys, then compared with predictions based upon computational models, and investigated through heat treatment of experimental alloys to develop an ultrafine γ + σ microstructure.",

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AU - Bean, Glenn E.

AU - Kesler, Michael S.

AU - Manuel, Michele V.

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N2 - Titanium aluminides are of interest due to their high specific strength and performance up to 750 °C. Research into high-Nb γ-TiAl based titanium aluminides has shown promising improvements in performance by introduction of the σ-Nb2Al phase. However, one current challenge is improving mechanical properties at room and elevated temperatures in order to enable their further implementation. These properties are closely tied with microstructural refinement, and thus phase evolution and microstructural development is the focus of this work. Phase transformation temperatures and stability ranges were determined experimentally through DSC analysis of arc melted alloys, then compared with predictions based upon computational models, and investigated through heat treatment of experimental alloys to develop an ultrafine γ + σ microstructure.

AB - Titanium aluminides are of interest due to their high specific strength and performance up to 750 °C. Research into high-Nb γ-TiAl based titanium aluminides has shown promising improvements in performance by introduction of the σ-Nb2Al phase. However, one current challenge is improving mechanical properties at room and elevated temperatures in order to enable their further implementation. These properties are closely tied with microstructural refinement, and thus phase evolution and microstructural development is the focus of this work. Phase transformation temperatures and stability ranges were determined experimentally through DSC analysis of arc melted alloys, then compared with predictions based upon computational models, and investigated through heat treatment of experimental alloys to develop an ultrafine γ + σ microstructure.

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KW - Thermodynamic properties

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Effect of Nb on phase transformations and microstructure in high Nb titanium aluminides

Abstract

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Keywords

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