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Effect of Nb Content and Temperature on the TiN Formation During the Oxidation of Ti3Al

Published online by Cambridge University Press:  10 February 2011

Lanting Zhang ,
Jiansheng Wu ,
Kai Jiang  and
Fei Wang
Lanting Zhang
Affiliation:
Open Lab of Education Ministry for High Temperature Materials and Testing, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
Jiansheng Wu
Affiliation:
Open Lab of Education Ministry for High Temperature Materials and Testing, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
Kai Jiang
Affiliation:
Open Lab of Education Ministry for High Temperature Materials and Testing, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
Fei Wang
Affiliation:
Open Lab of Education Ministry for High Temperature Materials and Testing, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
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Abstract

Nb addition to Ti3Al has been found to be effective to improve its oxidation resistance. Recently, the beneficial effect of nitrogen in the oxidation behaviour of Nb contained T3AI-based alloys has been noticed. In this paper, the oxidation behaviour of five alloys with different Nb content from 0 to 20 at. % exposed in room air at different temperatures (from 600 to 950,C) has been examined with the focus on the TiN formation in the oxide scale. No TiN is detected in the scales of binary Ti3Al under all temperatures tested. On the contrary, in alloys containing Nb, TiN is identified in the scales irrespective of the oxidation temperature. The amount of TiN formation differs with differentNb content. EPMA analysis of the cross section of the scales is performed and discussion is made accordingly.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK8.8.1
Copyright
Copyright © Materials Research Society 1999

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References

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