concept of dual-phase copper alloys was attractive to improve the mechanical performance of Cu. However, a systematic understanding of the interactions between second phase, twins, and dislocations in dual-phase copper alloys during deformation was urgent for further strengthening their mechanical properties. Herein, models of dual-phase Cu-Fe alloys with different Fe contents were established and simulated to deeply investigate the interaction between Cu matrix and Fe-enriched phase during deformation as well as the dislocation proliferation and structural changes at the atomic scale. It was found that numerous dislocations and twins were produced in Cu matrix during the deformation process, while grain boundaries of Fe-enriched phases were able to effectively impede the movement of dislocations, resulting in an enhancement of the alloy’s strength. Furthermore, new grain boundaries were appeared in the Fe-enriched phase of the dual-phase Cu-Fe alloys at higher strain rates, resulting in a certain grain refinement. With the increasing temperature, the main deformation mechanism of dual-phase Cu-Fe alloys were changed from dislocation slip to grain boundary slip. In addition, the additional Fe content can significantly strengthen the alloys, and the changes in the mechanical properties of dual-phase Cu-Fe alloys during deformation were verified via experiments.

中文翻译：

---

硬质相、孪晶和位错之间的相互作用增强了双相 Cu-Fe 合金


双相铜合金的概念对于提高铜的机械性能很有吸引力。然而，系统地了解双相铜合金变形过程中第二相、孪晶和位错之间的相互作用对于进一步增强其力学性能至关重要。本文建立并模拟了不同Fe含量的双相Cu-Fe合金模型，以深入研究变形过程中Cu基体和富Fe相之间的相互作用以及原子尺度上的位错扩散和结构变化。研究发现，变形过程中Cu基体中产生大量位错和孪晶，而富Fe相的晶界能够有效阻碍位错的运动，从而提高合金的强度。此外，在较高的应变速率下，双相Cu-Fe合金的富Fe相中出现了新的晶界，导致了一定的晶粒细化。随着温度的升高，双相Cu-Fe合金的主要变形机制由位错滑移转变为晶界滑移。此外，添加Fe含量可以显着强化合金，并通过实验验证了双相Cu-Fe合金在变形过程中力学性能的变化。