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Hot Deformation Behavior and Constitutive Equation of Cu–Cr–Zr Rods Prepared by Upward Continuous Casting

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Abstract

Continuous extrusion is a very promising technique for forming Cu–Cr–Zr alloys which takes the upward continuous casted rods as raw materials. While the hot deformation behavior and constitutive equation of as-cast rods have never been reported. In the present study, the hot deformation behavior of as-cast Cu–Cr–Zr rods with columnar grains was investigated. The results showed that the flow stress at 500 °C is higher than that at 400 °C. The reason for that can be attributed to the dynamic precipitation process, which was confirmed by TEM observations. At this temperature, partial CDRX dominates the softening mechanism while at high temperatures DRV and DDRX play a critical role. The constitutive equation was then established and the deformation activation energy was determined to be 541.93 kJ/mol. The high activation energy was attributed to the large solidified columnar grains. At high strains, stable metal flows can be obtained at high strain rates and high temperatures according to the processing maps, which indicates that a high-speed deformation at a high temperature is favorable to the plastic forming of this material. This investigation thus provides valuable information on how to process the Cu–Cr–Zr rods by plastic deformation methods, for example, continuous extrusion.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 52275312), the Science and Technology Planning Project of Liaoning Province (No. 2023JH2/101300241), the Educational Department of Liaoning Province (Nos. LJKMZ20220867, LJKMZ20222211, and LJKFZ20220202).

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Authors and Affiliations

  1. Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University, Dalian, 116028, China

    Ying Zhang, Xinbing Yun, Fengtong Zhu, Ruojing Zhao & Hongwang Fu

  2. Department of Mechanical and Electrical Engineering, Liaoning Vocational College of Industry, Dalian, 116100, China

    Ying Zhang

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  1. Ying Zhang
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  2. Xinbing Yun
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Correspondence to Xinbing Yun or Hongwang Fu.

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Zhang, Y., Yun, X., Zhu, F. et al. Hot Deformation Behavior and Constitutive Equation of Cu–Cr–Zr Rods Prepared by Upward Continuous Casting. Met. Mater. Int. (2024). https://doi.org/10.1007/s12540-024-01651-7

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