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The Effect of Ti Addition on Oxidation Behavior of FeAl Intermetallic Alloy

Published online by Cambridge University Press:  15 February 2011

Dingqiang Li ,
Dongliang Lin  and
T. L. Lin
Dingqiang Li
Affiliation:
Institute of Materials Science and Engineering, the Key Laboratory of High Temperature Materials & High Temperature Testing of the State Education Commission, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, P. R. China
Dongliang Lin
Affiliation:
Institute of Materials Science and Engineering, the Key Laboratory of High Temperature Materials & High Temperature Testing of the State Education Commission, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, P. R. China
T. L. Lin
Affiliation:
Institute of Materials Science and Engineering, the Key Laboratory of High Temperature Materials & High Temperature Testing of the State Education Commission, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, P. R. China
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Abstract

The influence of Ti addition on the high temperature oxidation behaviors of FeAl intermetallic alloys in air at 1000°C and 1100°C have been investigated. The oxidation kinetics of FeAl alloys were examined by the weight gain method and oxide products were examined by XRI), SEM, EDS and EPMA. The results showed that the oxidation kinetic curves of both Ti-doped and binary Fe-36.5A1 alloys were described as different parabolas followed the formula: (ΔW/S)2 =Kpt. The parabolic rate constant, Kp values are about 2.4 and 3.3 mg2cm-4h-1 for Fe-36.5A1 alloy and about 1.3 and 2.0 mg2cm-4V-1 for Fe-36.5Al-2Ti alloy when oxidizing at 1000°C and 1100°C respectively. The difference between Fe-36.5Al and Fe-36.5Al-2Ti alloy is not only in the surface morphology but also in the phase components. In the surface there is only α-Al2O3 oxide for the Fe-36.5Al alloy while there are α-Al2O3 and TiO oxide for the Fe-36.5Al-2Ti alloy. The effects of Ti addition on the oxidation resistance of FeAl alloy were discussed based on the micro structural evidence.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 349
Copyright
Copyright © Materials Research Society 1997

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References

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