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<p>The urgent need to overcome the strength-ductility trade-off of nickel-aluminum bronze (NAB) in deep-sea engineering motivates the design of a Cu-bearing multi-principal element alloy (MPEA), Cu<sub>35</sub>Ni<sub>35</sub>Co<sub>30</sub>, via magnetic levitation melting. The as-cast Cu<sub>35</sub>Ni<sub>35</sub>Co<sub>30</sub> MPEA exhibits a dual face-centered cubic (FCC) structure with superior mechanical properties (yield strength: ~ 503&#xa0;MPa, ultimate tensile strength: ~ 686&#xa0;MPa, total elongation: ~ 11.0%) over its counterparts fabricated by vacuum arc melting. A single-phase FCC structure was obtained by homogenizing at 1030&#xa0;°C for 15&#xa0;h. Cold rolling and post-deformation annealing (PDA) were used to construct heterogeneous grain structures, which were achieved in PDA-treated samples at 1030&#xa0;°C for 45&#xa0;s (PDA-1030-45s) and 60&#xa0;s (PDA-1030-60s). The PDA-1030-45s sample, composed of nano-sized recrystallized grains and residual deformed grains (RDGs), showed the best strength among the PDA-treated samples (a yield strength of ~ 864&#xa0;MPa, an ultimate tensile strength of ~ 959&#xa0;MPa, and a total elongation of ~ 13.4%). The PDA-1030-60s sample with micro-sized recrystallized grains and RDGs exhibits an excellent combination of strength and ductility, showing a yield strength of ~ 560&#xa0;MPa, an ultimate tensile strength of ~ 761&#xa0;MPa, and a total elongation of ~ 32.9%. These mechanical strengths are superior to those reported by NAB. The dominant strengthening mechanisms of the PDA-1030-45s and the PDA-1030-60s samples are dislocation strengthening and hetero-deformation-induced strengthening, respectively.</p> Graphic abstract <p></p>

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Microstructure and mechanical properties of magnetic levitation fabricated Cu35Ni35Co30 multi-principal element alloy

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Cheng-Yuan Zhu,
  • Chen-Liang Chu,
  • Zhi-Yong Yang,
  • Jun-Chen Liu,
  • Wei-Ping Chen,
  • Zhi-Qiang Fu

摘要

The urgent need to overcome the strength-ductility trade-off of nickel-aluminum bronze (NAB) in deep-sea engineering motivates the design of a Cu-bearing multi-principal element alloy (MPEA), Cu35Ni35Co30, via magnetic levitation melting. The as-cast Cu35Ni35Co30 MPEA exhibits a dual face-centered cubic (FCC) structure with superior mechanical properties (yield strength: ~ 503 MPa, ultimate tensile strength: ~ 686 MPa, total elongation: ~ 11.0%) over its counterparts fabricated by vacuum arc melting. A single-phase FCC structure was obtained by homogenizing at 1030 °C for 15 h. Cold rolling and post-deformation annealing (PDA) were used to construct heterogeneous grain structures, which were achieved in PDA-treated samples at 1030 °C for 45 s (PDA-1030-45s) and 60 s (PDA-1030-60s). The PDA-1030-45s sample, composed of nano-sized recrystallized grains and residual deformed grains (RDGs), showed the best strength among the PDA-treated samples (a yield strength of ~ 864 MPa, an ultimate tensile strength of ~ 959 MPa, and a total elongation of ~ 13.4%). The PDA-1030-60s sample with micro-sized recrystallized grains and RDGs exhibits an excellent combination of strength and ductility, showing a yield strength of ~ 560 MPa, an ultimate tensile strength of ~ 761 MPa, and a total elongation of ~ 32.9%. These mechanical strengths are superior to those reported by NAB. The dominant strengthening mechanisms of the PDA-1030-45s and the PDA-1030-60s samples are dislocation strengthening and hetero-deformation-induced strengthening, respectively.

Graphic abstract