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The Effect of Gd Additions on the Oxidation Resistance of TiAl Alloys Prepared by SPS

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Abstract

The oxidation resistance of TiAl alloy is still a problem in air above 800 ℃. Gadolinium is an active element which is known to improve the oxidation resistance of Mg alloy. Very dense TiAl-Gd alloys with several compositions were prepared by spark plasma sintering (SPS). Isothermal oxidation testing of sintered alloy in air at 800 ℃ was carried out for 500 h. The sintering microstructure, oxidation kinetics, oxide-layer structure and oxidation mechanism were systematically studied. The results show that Gd-containing TiAl alloy shows improved oxidation resistance at high temperature compared with alloy without Gd. The Gd-rich phase distributed along the boundary of powder particles can hinder the outward diffusion of Ti and Al and preferentially consume oxygen in the matrix, thus inhibiting the growth of oxide scale and improving the spalling resistance of TiAl alloy. TiAl-0.3Gd alloy has excellent oxidation resistance, with the lowest mass gain and the thinnest oxide scale of 2.64 mg/cm2 and 19.7 μm, respectively. This result will lay a foundation for the design of TiAl-based alloy with high-temperature oxidation resistance.

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Acknowledgements

This research was sponsored by the National Key Research and Development Program of China (No. 2016YFB1200505) and Cultivation project for original scientific research instruments and equipment of Southwest Jiaotong University (NO. XJ2021KJZK041).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China

    Qianqian Guo, Hongliang Sun, Zhengkun Cai, Yuxing Deng, Xiaosong Jiang & Song Chen

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  1. Qianqian Guo
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Guo, Q., Sun, H., Cai, Z. et al. The Effect of Gd Additions on the Oxidation Resistance of TiAl Alloys Prepared by SPS. Oxid Met 97, 323–339 (2022). https://doi.org/10.1007/s11085-021-10095-y

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  • DOI: https://doi.org/10.1007/s11085-021-10095-y

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