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High temperature gas nitridation and wear resistance of TiAl based alloys

Published online by Cambridge University Press:  21 March 2011

Bin Zhao ,
Jian Sun ,
Jiansheng Wu  and
Fei Wang
Bin Zhao
Affiliation:
Key Laboratory of the Ministry of Education for High Temperature Materials and Tests, School of Materials Science and Engineering, Shanghai Jiao Tong Univ., Shanghai 200030, P. R. China
Jian Sun
Affiliation:
Key Laboratory of the Ministry of Education for High Temperature Materials and Tests, School of Materials Science and Engineering, Shanghai Jiao Tong Univ., Shanghai 200030, P. R. China
Jiansheng Wu
Affiliation:
Key Laboratory of the Ministry of Education for High Temperature Materials and Tests, School of Materials Science and Engineering, Shanghai Jiao Tong Univ., Shanghai 200030, P. R. China
Fei Wang
Affiliation:
Key Laboratory of the Ministry of Education for High Temperature Materials and Tests, School of Materials Science and Engineering, Shanghai Jiao Tong Univ., Shanghai 200030, P. R. China
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Abstract

Gas nitridation of TiAl based alloys in an ammonia atmosphere was carried out in the present work. The nitride layers were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The evaluation of the surface hardness and wear resistance was performed to compare with those of the non-nitrided alloys. It is concluded that the nitride layers are composed of Ti2AlN as the inward-growing layer and TiN as the outward-growing layer. The nitridation temperature and time were two major factors influencing the thickness of the nitride layers of the alloys. The high temperature nitridation raised the surface hardness and the wear resistance of the TiAl based alloys markedly. The tribological behaviors of the nitrided alloys were also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.46.1
Copyright
Copyright © Materials Research Society 2001

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References

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