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Liquid-Phase Siliconizing and Aluminizing at the Surface of a Ti3Al-Based Alloy and Improvement in Oxidation Resistance

Published online by Cambridge University Press:  03 March 2011

Hua-Ping Xiong ,
Yong-Hui Xie ,
Wei Mao ,
Yun-Feng Chen  and
Xiao-Hong Li
Hua-Ping Xiong*
Affiliation:
Lab. of Welding and Forging, Beijing Institute of Aeronautical Materials,Beijing 100095, People’s Republic of China
Yong-Hui Xie
Affiliation:
Lab. of Welding and Forging, Beijing Institute of Aeronautical Materials,Beijing 100095, People’s Republic of China
Wei Mao
Affiliation:
Lab. of Welding and Forging, Beijing Institute of Aeronautical Materials,Beijing 100095, People’s Republic of China
Yun-Feng Chen
Affiliation:
Lab. of Welding and Forging, Beijing Institute of Aeronautical Materials,Beijing 100095, People’s Republic of China
Xiao-Hong Li
Affiliation:
Lab. of Welding and Forging, Beijing Institute of Aeronautical Materials,Beijing 100095, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: xiong@powder.material.tohoku.ac.jp (present); huaping.xiong@biam.ac.cn
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Abstract

A simple and inexpensive method to modify the surface of a Ti3Al-based alloy, liquid-phase siliconizing and aluminizing by an Al-Si alloy, has been proposed. The surface modification at 1013 K for 10 min using Al-10 wt% Si melt resulted in a modified layer with a thickness of about 21 μm, composed of TiAl3 and TiSi2. The coating improved the isothermal oxidation resistance of the Ti3Al-based alloy at 1073 K. A continuous alumina-rich scale was formed at the outermost surface after oxidation. SiO2 was detectable in the oxide scale. The results of x-ray diffraction and x-ray energy dispersive spectrometer analysis showed that during oxidation, some of the TiSi2 in the coating was oxidized to SiO2. In the meantime, the TiSi2 was reduced to a lower silicide, Ti5Si4. The change of the surface microstructure after oxidation and the diffusion reaction between the coating and the Ti3Al substrate were also discussed.

Keywords

Ti3Al intermetallicOxidationCoating
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 4 , April 2004 , pp. 1050 - 1057
Copyright
Copyright © Materials Research Society 2004

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