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Microstructure and hot flow stress at 970 °C of various heat-treated Ti2AlNb sheets

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Abstract

The microstructure and hot tensile behaviors of the different heat-treated Ti2AlNb sheets were investigated by backscattered electron image (BSE), electron backscattering diffraction (EBSD), transmission electron microscope (TEM) and tensile tests. The grain sizes and contents of α2, B2/β and O phases were quantitatively studied. As the heating time increases at 970 °C, the mean grain size and content of α2-phase increased. The grain shapes and distributions of the O-phase lamellar grains were affected by the heat treatments. The plastic deformation promoted the O → B2/β phase transition and the globularization of O-phase lamellar grains at 970 °C. Calculated by the creep equation and the iso-stress method, the grain size exponent was \(\mu = 1.1\) and the relationship between the material constants of B2/β and O phase was \(K_{{\text{O}}} = 1.14K_{{{\text{B}}2/\upbeta }}\).

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Acknowledgements

This work was financially supported the National Natural Science Foundation of China (No. 51805256).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Yong Wu, Rong-Lei Fan, Xian-Jun Zhou & Ming-He Chen

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  1. Yong Wu
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Correspondence to Yong Wu.

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Wu, Y., Fan, RL., Zhou, XJ. et al. Microstructure and hot flow stress at 970 °C of various heat-treated Ti2AlNb sheets. Rare Met. 39, 695–706 (2020). https://doi.org/10.1007/s12598-020-01408-2

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