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Effects of Nb Addition on Charpy Impact Properties of TiVTa Refractory High-Entropy Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

In the present study, the effects of Nb addition on Charpy impact properties of TiVTa refractory high-entropy alloy with high strength-ductility trade-off were systematically studied by using the instrumented Charpy impact testing machine. The experimental results showed that the impact toughness was remarkably improved by Nb addition in TiVTa to form TiVTaNb alloy. The crack initiation energy and propagation energy of TiVTaNb were 67.3% and 24.9% higher than that of TiVTa, indicating that Nb addition simultaneously reinforced the resistance to crack initiation and propagation. The impact fracture of TiVTaNb exhibited larger bending degree of shear lips, deeper dimples and more secondary cracks which effectively dissipated more impact energy. The deformation mechanism of TiVTa alloy was dominated by dislocation activities. While in TiVTaNb, the deformation mechanism was synergized by dislocation activities and deformation twinning, which were the main contributors for the improved impact properties and the stronger crack resistance of TiVTaNb alloy under impact loading.

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Acknowledgments

This work was financially supported by the China National Nuclear Corporation (CNNC) Science Fund for Talented Young Scholars (No. FY202307000120), the Continuous Basic Scientific Research Project (No. WDJC-2019-10), and the National Natural Science Foundation of China (No. U1867217).

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Correspondence to Yan-Kun Dou or Xin-Fu He.

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Yin, X., Dou, YK., He, XF. et al. Effects of Nb Addition on Charpy Impact Properties of TiVTa Refractory High-Entropy Alloy. Acta Metall. Sin. (Engl. Lett.) 36, 405–416 (2023). https://doi.org/10.1007/s40195-022-01494-4

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