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Microstructure and Mechanical Properties of TiAl Alloys with Gd Densified by Spark Plasma Sintering

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Abstract

Dense Ti-48Al-2Cr-2Nb-xGd (x = 0, 0.15, 0.3 at. %) alloys with different compositions were prepared by spark plasma sintering (SPS). The phase composition and microstructure of sintered alloys were studied by x-ray diffraction analyzer (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The mechanical properties were determined by room-temperature compression test. Results show that Gd2O3 and Al3Gd are the gadolinium-rich precipitates formed at the boundary of the original powder particles after the addition of Gd. However, with the increase in Gd addition, the precipitates will gather and grow together, and the dispersed fine precipitates play the role of dispersion strengthening, while the large particles gathered together play the opposite role. The TiAl alloy added with 0.15%Gd has the best compressive properties, and the ultimate compressive strength and fracture strain are 2750 MPa and 43.59%, respectively, which are significantly better than the cast alloy and the alloy without Gd.

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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. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Chengdu, 610031, People’s Republic of China

    Qianqian Guo, Hongliang Sun, Rui Liu, Xili Liu & Xiaosong Jiang

  2. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, People’s Republic of China

    Qianqian Guo, Hongliang Sun, Rui Liu, Xili Liu & Xiaosong Jiang

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  1. Qianqian Guo
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Guo, Q., Sun, H., Liu, R. et al. Microstructure and Mechanical Properties of TiAl Alloys with Gd Densified by Spark Plasma Sintering. J. of Materi Eng and Perform 32, 1627–1635 (2023). https://doi.org/10.1007/s11665-022-07234-0

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