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<p>In this study, Al-10.68Zn-3Mg-1.06Cu was used as the matrix, and Zr (0.1, 0.15, and 0.2&#xa0;wt.%) was added to systematically investigate its effects on microstructure, mechanical properties, and corrosion resistance using OM, SEM, EBSD, XRD, tensile testing, electrochemical measurements, and TEM. The results show that increasing Zr content refines grains and increases the number of Al<sub>3</sub>Zr nanoscale dispersoids, promoting heterogeneous nucleation and dislocation pinning, reducing the average grain size from 5.93 μm to 5.17 μm and increasing dislocation density from 4.93 × 10<sup>14</sup> m<sup>−2</sup> to 9.64 × 10<sup>14</sup> m<sup>−2</sup>. TEM analysis indicates that Al<sub>3</sub>Zr precipitates are nearly spherical, uniformly distributed, and slightly refined (from 3.81 to 3.34 nm), with an L1<sub>2</sub> structure and good coherent/semi-coherent interfaces with the Al matrix, exhibiting high chemical stability and effectively hindering dislocation motion and grain boundary migration. Mechanical properties improve with Zr content, with tensile strength increasing from 749.37 MPa (0.1 wt.% Zr) to 817.41 MPa (0.2 wt.% Zr) and elongation rising from 5.4% to 6.9%. Corrosion resistance is optimal at moderate Zr content (0.15 wt.%), showing the lowest corrosion current density (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({I}_{\text{corr}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>I</mi> <mtext>corr</mtext> </msub> </math></EquationSource> </InlineEquation> = 3.172 × 10<sup>−8</sup> A/cm<sup>2</sup>). These findings demonstrate that Zr microalloying significantly enhances the overall performance of Al-Zn-Mg-Cu alloys through grain refinement, dispersoid strengthening, dislocation strengthening, and grain boundary stabilization, with Al<sub>3</sub>Zr nanoscale precipitates playing a key role in the strengthening mechanism, providing guidance for optimizing high-strength, corrosion-resistant aluminum alloys.</p>

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Effect of Zr Microalloying on the Proprieties of Highly-Alloyed Al-10.68Zn-3Mg-1.06Cu Alloy

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • Zian Li,
  • Yu Li,
  • Deli Kong,
  • Xiaojing Xu

摘要

In this study, Al-10.68Zn-3Mg-1.06Cu was used as the matrix, and Zr (0.1, 0.15, and 0.2 wt.%) was added to systematically investigate its effects on microstructure, mechanical properties, and corrosion resistance using OM, SEM, EBSD, XRD, tensile testing, electrochemical measurements, and TEM. The results show that increasing Zr content refines grains and increases the number of Al3Zr nanoscale dispersoids, promoting heterogeneous nucleation and dislocation pinning, reducing the average grain size from 5.93 μm to 5.17 μm and increasing dislocation density from 4.93 × 1014 m−2 to 9.64 × 1014 m−2. TEM analysis indicates that Al3Zr precipitates are nearly spherical, uniformly distributed, and slightly refined (from 3.81 to 3.34 nm), with an L12 structure and good coherent/semi-coherent interfaces with the Al matrix, exhibiting high chemical stability and effectively hindering dislocation motion and grain boundary migration. Mechanical properties improve with Zr content, with tensile strength increasing from 749.37 MPa (0.1 wt.% Zr) to 817.41 MPa (0.2 wt.% Zr) and elongation rising from 5.4% to 6.9%. Corrosion resistance is optimal at moderate Zr content (0.15 wt.%), showing the lowest corrosion current density ( \({I}_{\text{corr}}\) I corr = 3.172 × 10−8 A/cm2). These findings demonstrate that Zr microalloying significantly enhances the overall performance of Al-Zn-Mg-Cu alloys through grain refinement, dispersoid strengthening, dislocation strengthening, and grain boundary stabilization, with Al3Zr nanoscale precipitates playing a key role in the strengthening mechanism, providing guidance for optimizing high-strength, corrosion-resistant aluminum alloys.