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Characterization of creep behavior of TiAl alloy with high Nb content at elevated temperatures

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Abstract

Creep experiments of the TiAl alloy with high Nb content were conducted to consider both the temperature dependence and stress dependence of its creep behavior. The creep curves were characterized by Theta constitutive model, and Newton–Gauss method was applied to obtain the material parameters. Based on the rupture strain, the rupture life of the TiAl alloy was able to be predicted by Theta constitutive model. The results show that the creep curves of the TiAl alloy contain primary creep, secondary creep and tertiary creep stages, especially for the lower stress. The rupture life of the TiAl alloy decreases with the increase in either applied stress or temperature. Theta constitutive model is able to describe the creep deformation of the TiAl alloy accurately, and the predicted life agrees well with the experimental result.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation for Young Scholars of China (No. 51401195) and the National Basic Research Program of China (No. 2011CB605506).

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Authors and Affiliations

  1. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing, 100095, China

    Cheng-Li Dong, Hui-Chen Yu & Ze-Hui Jiao

  2. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing, 100095, China

    Cheng-Li Dong, Hui-Chen Yu & Ze-Hui Jiao

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  1. Cheng-Li Dong
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  2. Hui-Chen Yu
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  3. Ze-Hui Jiao
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Correspondence to Cheng-Li Dong.

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Dong, CL., Yu, HC. & Jiao, ZH. Characterization of creep behavior of TiAl alloy with high Nb content at elevated temperatures. Rare Met. 35, 106–112 (2016). https://doi.org/10.1007/s12598-015-0643-x

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  • DOI: https://doi.org/10.1007/s12598-015-0643-x

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