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Constitutive Model for Hot Deformation of the Cu-Zr-Ce Alloy

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Abstract

Hot compressive deformation behavior of the Cu-Zr-Ce alloy has been investigated according to the hot deformation tests in the 550-900 °C temperature range and 0.001-10 s−1 strain rate range. Based on the true stress–true strain curves, the flow stress behavior of the Cu-Zr-Ce alloy was investigated. Microstructure evolution was observed by optical microscopy. Based on the experimental results, a constitutive equation, which reflects the relationships between the stress, strain, strain rate and temperature, has been established. Material constants n, α, Q and ln A were calculated as functions of strain. The equation predicting the flow stress combined with these materials constants has been proposed. The predicted stress is consistent with experimental stress, indicating that developed constitutive equation can adequately predict the flow stress of the Cu-Zr-Ce alloy. Dynamic recrystallization critical strain was determined using the work hardening rate method. According to the dynamic material model, the processing maps for the Cu-Zr and Cu-Zr-Ce alloy were obtained at 0.4 and 0.5 strain. Based on the processing maps and microstructure observations, the optimal processing parameters for the two alloys were determined, and it was found that the addition of Ce can promote the hot workability of the Cu-Zr alloy.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51101052) and the National Science Foundation (IRES 1358088).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471003, China

    Yi Zhang, Huili Sun, Bingjie Wang, Baohong Tian, Yong Liu & Kexing Song

  2. Collaborative Innovation Center of Nonferrous Metals, Luoyang, 471003, Henan Province, China

    Yi Zhang, Huili Sun, Bingjie Wang, Baohong Tian, Yong Liu & Kexing Song

  3. Department of Mechanical Engineering, University of South Florida, Tampa, FL, 33620, USA

    Alex A. Volinsky

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  1. Yi Zhang
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  2. Huili Sun
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Correspondence to Yi Zhang or Huili Sun.

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Zhang, Y., Sun, H., Volinsky, A.A. et al. Constitutive Model for Hot Deformation of the Cu-Zr-Ce Alloy. J. of Materi Eng and Perform 27, 728–738 (2018). https://doi.org/10.1007/s11665-018-3168-2

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  • DOI: https://doi.org/10.1007/s11665-018-3168-2

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