Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-24T15:40:44.475Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Appel, F.Wagner, R.: Microstructure and deformation of two-phase gamma-titanium aluminides. Mater. Sci. Eng. 22, 187 1998Google Scholar
2Dettenwanger, F., Schumann, E., Rühle, M., Rakowski, J.Meier, G.H.: Microstructural study of oxidized γ-TiAl. Oxid. Met. 50(3/4), 269 1998CrossRefGoogle Scholar
3Becker, S., Rahmel, A., Schorr, M.Schütze, M.: Mechanism of isothermal oxidation of the intermetallic TiAl and of TiAl alloys. Oxid. Met. 38(5/6), 425 1992Google Scholar
4Yoshihara, M.Kim, Y-W.A Comparative Study of Oxidation Resistance of Engineering Gamma TiAl Alloys, in Gamma Titanium Aluminides 1999(The Minerals, Metals & Materials Society, Warrendale, PA, 1999), p. 753.Google Scholar
5Rahmel, A.Spencer, P.J.: Thermodynamic aspects of TiAl and TiSi2oxidation: The Al–Ti–O and Si–Ti–O phase diagrams. Oxid. Met. 35(1/2), 53 1991CrossRefGoogle Scholar
6Schemet, V., Tyagi, A.K., Becker, J.S., Lersch, P., Singheiser, L.Quadakkers, W.J.: The formation of protective alumina-based scales during high-temperature air oxidation of γ-TiAl Alloys. Oxid. Met. 54(3/4), 211 2000CrossRefGoogle Scholar
7Lang, C.Schütze, M.: TEM investigations of the early stages of TiAl oxidation. Oxid. Met. 46(3/4), 255 1996CrossRefGoogle Scholar
8Xi, Y.J., Wang, F.H., Lu, W., Guo, Ch.Y.He, L.L.: Microstructure of oxide scales formed on Ti–48Al–8Cr–2Ag Alloy in air at 900–1000 °C. Oxid. Met. 63(3/4), 229 2005CrossRefGoogle Scholar
9Kekare, S.A.Aswath, P.B.: Oxidation of TiAl based intermetallics. J. Mater. Sci. 32, 2485 1997Google Scholar
10Stroosnijder, M.F., Zheng, N., Quadakkers, W.J., Hofman, R., Gil, A.Lanza, F.: The effect of niobium ion implantation on the oxidation behavior of a γ-TiAl-based intermetallic. Oxid. Met. 46, 9 1996CrossRefGoogle Scholar
11Lu, W., Chen, Ch.L., Xi, Y.J., Wang, F.H.He, L.L.The oxidation behavior of Ti-46.5Al-5Nb at 900 °C.Intermetallics, (in press)Google Scholar
12Pennycook, S.J.Jesson, D.E.: High-resolution incoherent imaging of crystals. Phys. Rev. Lett. 64, 938 1990CrossRefGoogle ScholarPubMed
13Wang, S., Boriserich, A.Y., Rashkeev, S.N., Glazoff, M.V., Sohlberg, K., Pennycook, S.J.Pantelides, S.T.: Dopants adsorbed as single atoms degradation of catalysts. Nat. Mater. 3, 143 2004CrossRefGoogle ScholarPubMed
14Browning, N.D., Chisholm, M.F.Pennycook, S.J.: Atomic-resolution chemical analysis using a scanning transmission electron microscope. Nature 366(11), 143 1993Google Scholar
15Yoshihara, M.Miura, K.: Effects of Nb addition on oxidation behavior of TiAl. Intermetallics 3, 357 1995Google Scholar
16Rakowski, J.M.: The Environmental Degradation of Titanium– Aluminum Alloys, M.S. Thesis, Department of Materials Science and Engineering, School of Engineering, University of Pittsburgh, 1997Google Scholar
17Freudenberg, B.Mocellin, A.: Aluminium titanate formation by solid state reaction of Al2O3and TiO2single crystals. J. Mater. Sci. 25, 3701 1990CrossRefGoogle Scholar