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Effect of niobium on the oxidation behavior of TiAl

Published online by Cambridge University Press:  31 January 2011

Wei Lu ,
ChunLin Chen ,
LianLong He ,
YanJun Xi  and
FuHui Wang
Wei Lu
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and Graduate School of Chinese Academy of Science, Beijing 100039, China
ChunLin Chen
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and Graduate School of Chinese Academy of Science, Beijing 100039, China
LianLong He*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and Graduate School of Chinese Academy of Science, Beijing 100039, China
YanJun Xi
Affiliation:
Department of Materials and Chemical Engineering, Zhongyuan Institute of Technology
FuHui Wang
Affiliation:
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P.R. China
*
a)Address all correspondence to this author. e-mail: llhe@imr.ac.cn
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Abstract

Two TiO2layers formed in TiAl oxidation for 50 h at 900 °C were studied using scanning transmission electron microscopy. The main efforts were placed on the investigation of the distribution of niobium. It was found that Nb enriched in TiO2grains of mixture layer but did not exist in the outer TiO2layer. High-resolution electron microscopy (HREM) Z-contrast image revealed that Nb substitute for Ti site leading to Nb enrichment in TiO2grains of the mixture layer. The formation mechanism of the two TiO2layers and the potential effect of Nb doping in the mixture layer were also discussed.

Keywords

OxidationScanning transmission electron microscopy (STEM)

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Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 6 , June 2007 , pp. 1486 - 1490
Copyright
Copyright © Materials Research Society2007

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References

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