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Phase equilibria and solidified microstructure in Cu–Cr–La ternary system via experimental investigation and thermodynamic calculation

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Abstract

The phase equilibria and solidified microstructure of Cu–Cr–La system were investigated by a combination of key experiments and thermodynamic calculations. Six Cu–Cr–La ternary alloys were utilized to determine the solidified microstructure, isothermal section at 850 °C and phase transition temperatures along 5.0 at.% La by means of X-ray diffraction, scanning electron microscopy, electron probe micro-analysis and differential scanning calorimetric techniques. By considering the present measured equilibrium data, the thermodynamic description for the Cu–Cr–La system was established via CALPHAD approach. The calculated phase relationship and phase fractions in equilibrium state shows a satisfactory agreement with the determined data. After that, the non-equilibrium solidification curves in different series Cu–Cr–La alloys were simulated with the Scheil–Gulliver model. The effects of La or Cr additions on the solidification sequences, phase transition temperatures and phase fractions in Cu–Cr–La alloys were analyzed. It is believed that the present work offers a theoretical basis for the novel design of Cu–Cr–La alloys.

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Acknowledgements

The financial supports are from the National Natural Science Foundation of China (Grant No. 52101012), National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials (Grant No. HKDNM2019019). Y. Tang acknowledges the financial support from Yuanguang fellowship released by Hebei University of Technology.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300401, People’s Republic of China

    Mingwen Wen, Ying Tang, Enkuan Zhang, Xingchuan Xia & Jian Ding

  2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, Hunan, People’s Republic of China

    Lijun Zhang

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Wen, M., Tang, Y., Zhang, E. et al. Phase equilibria and solidified microstructure in Cu–Cr–La ternary system via experimental investigation and thermodynamic calculation. J Mater Sci 58, 3323–3333 (2023). https://doi.org/10.1007/s10853-023-08223-x

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