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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*
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: [email protected] (present); [email protected]
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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.

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Articles
Copyright
Copyright © Materials Research Society 2004

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