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Effect of Surface Treatment on the Formation of Oxygen Enriched Brittle Layer in A Ti3A1-Nb Alloy

Published online by Cambridge University Press:  22 February 2011

B. Zhang ,
X. Wan ,
D. Li ,
J. Wang ,
H. Wang  and
W. R. Chen
B. Zhang
Affiliation:
Shanghai University of Technology, The Institute of Materials Science, 149 Yanchang Road, Shanghai 200072, P.R.C.
X. Wan
Affiliation:
Shanghai University of Technology, The Institute of Materials Science, 149 Yanchang Road, Shanghai 200072, P.R.C.
D. Li
Affiliation:
Institute of Metals Research, Academia Sinica, Shenyang 110015, P.R.C.
J. Wang
Affiliation:
Shanghai University of Technology, The Institute of Materials Science, 149 Yanchang Road, Shanghai 200072, P.R.C.
H. Wang
Affiliation:
Shanghai University of Technology, The Institute of Materials Science, 149 Yanchang Road, Shanghai 200072, P.R.C.
W. R. Chen
Affiliation:
Shanghai University of Technology, The Institute of Materials Science, 149 Yanchang Road, Shanghai 200072, P.R.C.
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Abstract

Effect of surface treatment on the formation of oxygen enriched brittle layer in a Ti3Al-Nb alloy was investigated. The results show that a mixed Ti2N and TiN layer was formed at the surface by the titanium nitride vapor deposit treatment, and this titanium nitride layer makes it possible to suppress the formation of the oxygen enriched brittle layer during thermal exposure. An Al2O3 film was formed at the surface of the alloy, when the surface treatment was conducted under a low partial pressure oxygen atmosphere. However, such surface treatment is not able to depress the formation of the oxygen enriched brittle layer during thermal exposure, due to the higher affinity of α2 phase for oxygen as well as the higher diffusivity of titanium in Al2O3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1189
Copyright
Copyright © Materials Research Society 1995

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