Core-multishell globular oxidation in a new TiAlNbCr alloy at high temperatures

Abstract Oxidation resistance is one of key properties of titanium aluminide (TiAl) based alloys for high-temperature applications such as in advanced aero-engines and gas turbines. A new TiAlNbCr alloy with micro-addition of yttrium has been developed, but its oxidation behavior is unknown. To prov...

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Autores principales:	S. Q. Tang, S. J. Qu, A. H. Feng, C. Feng, J. Shen, D. L. Chen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3ee32f8fcbf243c69f45a05d14ff8849
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spelling	oai:doaj.org-article:3ee32f8fcbf243c69f45a05d14ff88492021-12-02T15:06:15ZCore-multishell globular oxidation in a new TiAlNbCr alloy at high temperatures10.1038/s41598-017-03690-02045-2322https://doaj.org/article/3ee32f8fcbf243c69f45a05d14ff88492017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03690-0https://doaj.org/toc/2045-2322Abstract Oxidation resistance is one of key properties of titanium aluminide (TiAl) based alloys for high-temperature applications such as in advanced aero-engines and gas turbines. A new TiAlNbCr alloy with micro-addition of yttrium has been developed, but its oxidation behavior is unknown. To provide some fundamental insights, high-temperature oxidation characteristics of this alloy are examined via scanning electron microscopy, transmission electron microscopy, electron probe microanalysis, and X-ray diffraction. We show that distinctive core-multishell globular oxidation and “daisy” flower-like oxidation occur exclusively around Y2O3 particles. Globular oxides exhibit multi-layered Y2O3/TiO2/Al2O3-rich/TiO2-rich shell structures from the inside to outside. Flower-like inner oxides consist of core Y2O3 particles surrounded by divergent Al2O3 and oxygen-rich α2-Ti3Al in the near-scale substrate. As the scale-substrate interface moves inward, the inner oxide structures suffer deeper oxidation and transform into the globular oxide structures. Our results demonstrate that the unique oxidation characteristics and the understanding of formation mechanisms pave the way for the exploration and development of advanced oxidation-resistant TiAl-based materials.S. Q. TangS. J. QuA. H. FengC. FengJ. ShenD. L. ChenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q S. Q. Tang S. J. Qu A. H. Feng C. Feng J. Shen D. L. Chen Core-multishell globular oxidation in a new TiAlNbCr alloy at high temperatures
description	Abstract Oxidation resistance is one of key properties of titanium aluminide (TiAl) based alloys for high-temperature applications such as in advanced aero-engines and gas turbines. A new TiAlNbCr alloy with micro-addition of yttrium has been developed, but its oxidation behavior is unknown. To provide some fundamental insights, high-temperature oxidation characteristics of this alloy are examined via scanning electron microscopy, transmission electron microscopy, electron probe microanalysis, and X-ray diffraction. We show that distinctive core-multishell globular oxidation and “daisy” flower-like oxidation occur exclusively around Y2O3 particles. Globular oxides exhibit multi-layered Y2O3/TiO2/Al2O3-rich/TiO2-rich shell structures from the inside to outside. Flower-like inner oxides consist of core Y2O3 particles surrounded by divergent Al2O3 and oxygen-rich α2-Ti3Al in the near-scale substrate. As the scale-substrate interface moves inward, the inner oxide structures suffer deeper oxidation and transform into the globular oxide structures. Our results demonstrate that the unique oxidation characteristics and the understanding of formation mechanisms pave the way for the exploration and development of advanced oxidation-resistant TiAl-based materials.
format	article
author	S. Q. Tang S. J. Qu A. H. Feng C. Feng J. Shen D. L. Chen
author_facet	S. Q. Tang S. J. Qu A. H. Feng C. Feng J. Shen D. L. Chen
author_sort	S. Q. Tang
title	Core-multishell globular oxidation in a new TiAlNbCr alloy at high temperatures
title_short	Core-multishell globular oxidation in a new TiAlNbCr alloy at high temperatures
title_full	Core-multishell globular oxidation in a new TiAlNbCr alloy at high temperatures
title_fullStr	Core-multishell globular oxidation in a new TiAlNbCr alloy at high temperatures
title_full_unstemmed	Core-multishell globular oxidation in a new TiAlNbCr alloy at high temperatures
title_sort	core-multishell globular oxidation in a new tialnbcr alloy at high temperatures
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/3ee32f8fcbf243c69f45a05d14ff8849
work_keys_str_mv	AT sqtang coremultishellglobularoxidationinanewtialnbcralloyathightemperatures AT sjqu coremultishellglobularoxidationinanewtialnbcralloyathightemperatures AT ahfeng coremultishellglobularoxidationinanewtialnbcralloyathightemperatures AT cfeng coremultishellglobularoxidationinanewtialnbcralloyathightemperatures AT jshen coremultishellglobularoxidationinanewtialnbcralloyathightemperatures AT dlchen coremultishellglobularoxidationinanewtialnbcralloyathightemperatures
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Core-multishell globular oxidation in a new TiAlNbCr alloy at high temperatures

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