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<p>To improve the plastic deformation capacity of the immiscible Cu-7Fe alloy, this study investigated the effects of Ag and Al additions on the stacking fault energy (SFE) and microstructural properties by combining first-principles calculations with experimental methods. The results demonstrate that both Ag and Al effectively modified the morphology and distribution of the second phases in the Cu-Fe alloy. Specifically, the addition of Ag eliminated coarse dendritic Fe phases, while the addition of Al promoted the spheroidization of some Fe phases. In terms of mechanical properties, the addition of Ag increased the alloy strength from 308&#xa0;MPa to 318&#xa0;MPa and the elongation from 30% to 33.3%, achieving simultaneous enhancement of both strength and plasticity. In contrast, the addition of Al slightly reduced the strength to 290&#xa0;MPa while still improving the elongation to 31.3%. First-principles calculations reveal at the atomic scale that the addition of Ag and Al decreases the SFE of the Cu-Fe alloy to varying extents, thereby improving its plastic deformation capacity. These experimental results are consistent with theoretical predictions, confirming that regulating SFE is an effective approach for improving the comprehensive properties of Cu-Fe alloys.</p>

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Effect of Ag and Al Additions on the Strength and Plasticity of As-Cast Cu-7Fe Alloy Based on First-Principles Calculations

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Shikang Zhou,
  • Yanmin Zhang,
  • Feiyue Liu,
  • Xiangyang Xue,
  • Kexing Song,
  • Zhen Wang,
  • Yaoke Xu,
  • Miaomiao Wang

摘要

To improve the plastic deformation capacity of the immiscible Cu-7Fe alloy, this study investigated the effects of Ag and Al additions on the stacking fault energy (SFE) and microstructural properties by combining first-principles calculations with experimental methods. The results demonstrate that both Ag and Al effectively modified the morphology and distribution of the second phases in the Cu-Fe alloy. Specifically, the addition of Ag eliminated coarse dendritic Fe phases, while the addition of Al promoted the spheroidization of some Fe phases. In terms of mechanical properties, the addition of Ag increased the alloy strength from 308 MPa to 318 MPa and the elongation from 30% to 33.3%, achieving simultaneous enhancement of both strength and plasticity. In contrast, the addition of Al slightly reduced the strength to 290 MPa while still improving the elongation to 31.3%. First-principles calculations reveal at the atomic scale that the addition of Ag and Al decreases the SFE of the Cu-Fe alloy to varying extents, thereby improving its plastic deformation capacity. These experimental results are consistent with theoretical predictions, confirming that regulating SFE is an effective approach for improving the comprehensive properties of Cu-Fe alloys.