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High Temperature Mechanical Behavior of Ti-45Al-8Nb and Its Cavity Evolution in Deformation

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Abstract

The tensile property of a high Nb containing TiAl-based alloy (Ti-45Al-8Nb) was investigated in the temperature range of 900-1050 °C and strain rate range of 1 × 10−3 to 2.5 × 10−2 s−1. The results revealed that the yield stress decreased with increasing temperature and decreasing strain rate, while the tensile elongation increased with an increase in temperature and a decrease in strain rate. Hence, The minimum yield stress of 119.2 MPa and the maximum elongation of 237% were obtained at the temperature of 1050 °C and strain rate of 1 × 10−3 s−1. Based on the experimental data, the activation energy of the alloy was calculated to be 360 kJ/mol. Moreover, the microstructure and the fracture morphology of the specimens were observed, and the results revealed that the distribution of cavities was related to deformation parameters and the fracture mode was typically dimple-type.

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Acknowledgment

This work was supported by the National Science and Technology Major Project of China. The Project No. is 2014ZX04001-141.

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Authors and Affiliations

  1. School of Material Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Zhihao Du, Kaifeng Zhang & Shaosong Jiang

  2. Capital Spaceflight Machinery Company, Beijing, 100084, China

    Ruican Zhu & Shuguang Li

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  1. Zhihao Du
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  2. Kaifeng Zhang
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  3. Shaosong Jiang
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  4. Ruican Zhu
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  5. Shuguang Li
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Correspondence to Zhihao Du.

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Du, Z., Zhang, K., Jiang, S. et al. High Temperature Mechanical Behavior of Ti-45Al-8Nb and Its Cavity Evolution in Deformation. J. of Materi Eng and Perform 24, 3746–3754 (2015). https://doi.org/10.1007/s11665-015-1676-x

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  • DOI: https://doi.org/10.1007/s11665-015-1676-x

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