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<p>This study investigates the effects of zinc addition (0.01–12.6 wt.%) on the microstructure, mechanical, thermal, and corrosion properties of AA 5754 alloy (Al-2.6% Mg) using optical microscopy, secondary electron imaging, X-ray diffraction, micro-Vickers hardness testing, tensile testing, differential scanning calorimetry, and nitric acid mass-loss analysis. The experimental alloys were prepared by melting calculated amounts of AA 5754 alloy and pure zinc in an electric resistance furnace. The addition of zinc promotes the formation of η-phase (MgZn₂) precipitates, resulting in increased hardness (from 53.5 HV1 at 0.01 wt.% Zn to 115.5 HV1 at 12.6 wt.% Zn) and tensile strength (from 216.6&#xa0;MPa to 421.5&#xa0;MPa), accompanied by reductions in elongation (14.7% to 4.8%), corrosion resistance, and thermal stability. With increasing zinc content, the solidus temperature decreases from 620.4&#xa0;°C to 595.5&#xa0;°C, while the liquidus temperature decreases from 647.1&#xa0;°C to 627.9&#xa0;°C.</p>

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Microstructure, Mechanical, Thermal and Corrosion Properties of Zn-modified Al–Mg Alloy

  • 期刊论文

  • 发表日期：

    2026年3月29日

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  • Nikunj Patel,
  • Gaurav Mittal,
  • Ajaya Kumar Pradhan

摘要

This study investigates the effects of zinc addition (0.01–12.6 wt.%) on the microstructure, mechanical, thermal, and corrosion properties of AA 5754 alloy (Al-2.6% Mg) using optical microscopy, secondary electron imaging, X-ray diffraction, micro-Vickers hardness testing, tensile testing, differential scanning calorimetry, and nitric acid mass-loss analysis. The experimental alloys were prepared by melting calculated amounts of AA 5754 alloy and pure zinc in an electric resistance furnace. The addition of zinc promotes the formation of η-phase (MgZn₂) precipitates, resulting in increased hardness (from 53.5 HV1 at 0.01 wt.% Zn to 115.5 HV1 at 12.6 wt.% Zn) and tensile strength (from 216.6 MPa to 421.5 MPa), accompanied by reductions in elongation (14.7% to 4.8%), corrosion resistance, and thermal stability. With increasing zinc content, the solidus temperature decreases from 620.4 °C to 595.5 °C, while the liquidus temperature decreases from 647.1 °C to 627.9 °C.