TEM investigation of the oxide scale of Ti-46.5Al-5Nb at 900 °C for 50 h

Wei Lu; Chunlin Chen; Yanjun Xi; Changyou Guo; Fuhui Wang; Lianlong He

doi:10.1016/j.intermet.2006.10.014

TEM investigation of the oxide scale of Ti-46.5Al-5Nb at 900 °C for 50 h

Wei Lu, Chunlin Chen, Yanjun Xi, Changyou Guo, Fuhui Wang, Lianlong He

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

23 Citations (Scopus)

Abstract

In the present work, microstructure of oxide scale of Ti-46.5Al-5Nb oxidized for 50 h at 900 °C in air was investigated in both plane-viewed and cross-sectional samples using transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). In the TiO₂ and Al₂O₃ mixture layer, orientation relationships (OR) between the Al₂O₃ and TiO₂ phases were identified to be [1 over(1, ̄) 0]_{Al2 O3} / / [001]_TiO2 and (001)_{Al2 O3} / / (110)_TiO2, however, some misorientation existed at their interface. Besides, Nb enrichment was detected in the TiO₂ phase in this layer but no Nb was found in the outer TiO₂ layer. Al₃Nb phase was identified between the oxide scale and TiAl base. This phase would promote TiAl oxidation protection due to hinder 'x' phase continuous formation.

Original language	English
Pages (from-to)	824-831
Number of pages	8
Journal	Intermetallics
Volume	15
Issue number	5-6
DOIs	https://doi.org/10.1016/j.intermet.2006.10.014
Publication status	Published - 2007 May

Keywords

A. Titanium aluminides, based on TiAl
B. Oxidation
F. Electron microscopy, transmission

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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@article{8f42f1e85c0645408902aee9e8414944,

title = "TEM investigation of the oxide scale of Ti-46.5Al-5Nb at 900 °C for 50 h",

abstract = "In the present work, microstructure of oxide scale of Ti-46.5Al-5Nb oxidized for 50 h at 900 °C in air was investigated in both plane-viewed and cross-sectional samples using transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). In the TiO2 and Al2O3 mixture layer, orientation relationships (OR) between the Al2O3 and TiO2 phases were identified to be [1 over(1,{\= }) 0]Al2 O3 / / [001]TiO2 and (001)Al2 O3 / / (110)TiO2, however, some misorientation existed at their interface. Besides, Nb enrichment was detected in the TiO2 phase in this layer but no Nb was found in the outer TiO2 layer. Al3Nb phase was identified between the oxide scale and TiAl base. This phase would promote TiAl oxidation protection due to hinder 'x' phase continuous formation.",

keywords = "A. Titanium aluminides, based on TiAl, B. Oxidation, F. Electron microscopy, transmission",

author = "Wei Lu and Chunlin Chen and Yanjun Xi and Changyou Guo and Fuhui Wang and Lianlong He",

note = "Funding Information: This work has been supported by the National Natural Science Foundation of China (no. 50171068).",

year = "2007",

month = may,

doi = "10.1016/j.intermet.2006.10.014",

language = "English",

volume = "15",

pages = "824--831",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Limited",

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T1 - TEM investigation of the oxide scale of Ti-46.5Al-5Nb at 900 °C for 50 h

AU - Lu, Wei

AU - Chen, Chunlin

AU - Xi, Yanjun

AU - Guo, Changyou

AU - Wang, Fuhui

AU - He, Lianlong

N1 - Funding Information: This work has been supported by the National Natural Science Foundation of China (no. 50171068).

PY - 2007/5

Y1 - 2007/5

N2 - In the present work, microstructure of oxide scale of Ti-46.5Al-5Nb oxidized for 50 h at 900 °C in air was investigated in both plane-viewed and cross-sectional samples using transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). In the TiO2 and Al2O3 mixture layer, orientation relationships (OR) between the Al2O3 and TiO2 phases were identified to be [1 over(1, ̄) 0]Al2 O3 / / [001]TiO2 and (001)Al2 O3 / / (110)TiO2, however, some misorientation existed at their interface. Besides, Nb enrichment was detected in the TiO2 phase in this layer but no Nb was found in the outer TiO2 layer. Al3Nb phase was identified between the oxide scale and TiAl base. This phase would promote TiAl oxidation protection due to hinder 'x' phase continuous formation.

AB - In the present work, microstructure of oxide scale of Ti-46.5Al-5Nb oxidized for 50 h at 900 °C in air was investigated in both plane-viewed and cross-sectional samples using transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). In the TiO2 and Al2O3 mixture layer, orientation relationships (OR) between the Al2O3 and TiO2 phases were identified to be [1 over(1, ̄) 0]Al2 O3 / / [001]TiO2 and (001)Al2 O3 / / (110)TiO2, however, some misorientation existed at their interface. Besides, Nb enrichment was detected in the TiO2 phase in this layer but no Nb was found in the outer TiO2 layer. Al3Nb phase was identified between the oxide scale and TiAl base. This phase would promote TiAl oxidation protection due to hinder 'x' phase continuous formation.

KW - A. Titanium aluminides, based on TiAl

KW - B. Oxidation

KW - F. Electron microscopy, transmission

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