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

  • Hua-Ping Xiong (a1), Yong-Hui Xie (a1), Wei Mao (a1), Yun-Feng Chen (a1) and Xiao-Hong Li (a1)...

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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Corresponding author

a)Address all correspondence to this author. e-mail: xiong@powder.material.tohoku.ac.jp (present); huaping.xiong@biam.ac.cn

References

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

  • Hua-Ping Xiong (a1), Yong-Hui Xie (a1), Wei Mao (a1), Yun-Feng Chen (a1) and Xiao-Hong Li (a1)...

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