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<p>Hypereutectic aluminum-antimony (Al-Sb) alloys with varying Sb contents (20–70 wt.%) were synthesized via powder metallurgy alongside pure Al. Structural characterization by x-ray diffraction (XRD) confirmed the presence of cubic α-Al, AlSb intermetallics, and rhombohedral Sb phases. The surface morphology revealed a uniform distribution and coarsening of Sb/AlSb within the Al matrix. Moreover, the mechanical properties of the samples were also evaluated using Vickers microhardness under different loads and testing times. The microhardness exhibited an increase with Sb addition, reaching ~ 164&#xa0;MPa at 20 wt.% of Sb. This value is nearly double that of pure Al, due to supersaturated solid solutions, refined AlSb, and Sb phases. Stress exponent analysis indicated that dislocation motion was hindered by intermetallic compounds, influencing deformation mechanisms. Corrosion performance was assessed in 3.5% NaCl using open-circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). Results showed that Sb addition deteriorates the corrosion resistance of the samples, with increasing corrosion current density, higher corrosion rates, and the potential shift toward more negative values. This degradation is attributed to AlSb intermetallics disrupting the continuity of the protective oxide film. At higher Sb levels, corrosion resistance decreased considerably, with a deterioration of ~ 720% compared to pure Al. Overall, Sb enhances hardness but compromises corrosion resistance in Al-Sb alloys.</p>

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Structural, Mechanical, and Corrosion Characteristics of Hypereutectic Al-Sb Alloys Synthesized by Powder Metallurgy

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Mohammed Salamah Alruwaili,
  • Eman AbdElRhiem,
  • Abdelhamid Elzarka,
  • Rizk Mostafa Shalaby

摘要

Hypereutectic aluminum-antimony (Al-Sb) alloys with varying Sb contents (20–70 wt.%) were synthesized via powder metallurgy alongside pure Al. Structural characterization by x-ray diffraction (XRD) confirmed the presence of cubic α-Al, AlSb intermetallics, and rhombohedral Sb phases. The surface morphology revealed a uniform distribution and coarsening of Sb/AlSb within the Al matrix. Moreover, the mechanical properties of the samples were also evaluated using Vickers microhardness under different loads and testing times. The microhardness exhibited an increase with Sb addition, reaching ~ 164 MPa at 20 wt.% of Sb. This value is nearly double that of pure Al, due to supersaturated solid solutions, refined AlSb, and Sb phases. Stress exponent analysis indicated that dislocation motion was hindered by intermetallic compounds, influencing deformation mechanisms. Corrosion performance was assessed in 3.5% NaCl using open-circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). Results showed that Sb addition deteriorates the corrosion resistance of the samples, with increasing corrosion current density, higher corrosion rates, and the potential shift toward more negative values. This degradation is attributed to AlSb intermetallics disrupting the continuity of the protective oxide film. At higher Sb levels, corrosion resistance decreased considerably, with a deterioration of ~ 720% compared to pure Al. Overall, Sb enhances hardness but compromises corrosion resistance in Al-Sb alloys.