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Open Access Nano Express

Gas nitriding and subsequent oxidation of Ti-6Al-4V alloys

Dong Bok Lee1, Iryna Pohrelyuk2, Oleh Yaskiv2 and Jae Chun Lee3*

Author affiliations

1 School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea

2 Physico-Mechanical Institute of National Academy of Sciences, Lviv, 79601, Ukraine

3 Department of Materials Science and Engineering, Myongji University, Yongin, 449-728, South Korea

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Citation and License

Nanoscale Research Letters 2012, 7:21  doi:10.1186/1556-276X-7-21

Published: 5 January 2012

Abstract

Ti-6Al-4V alloys consisting of α-Ti grains and intergranular β-Ti islands were nitrided at 850°C for 1 to 12 h under a nitrogen pressure of 1 Pa. With increasing nitriding time, the Ti-N compound layer became thicker, and the α-Ti diffusion zone containing dissolved nitrogen became wider. In the Ti-N compound layer, the initially formed Ti2N became TiN as the nitriding progressed. The nitride layers were oxidized to rutile-TiO2 after oxidation at 700°C for 10 h in air.

Keywords:
titanium; nitriding; nitrogen; oxidation