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<p>This study provides new insights into the role of compositional control and hot rolling parameters in optimizing the performance of AA5052 aluminum alloy. The alloy was homogenized at 560&#xa0;°C for 20 hours followed by multi-pass and single-pass hot rolling with a rolling reduction of 74% at different temperatures (480, 490, 500, 510, and 520&#xa0;°C). The objective was to achieve a balanced microstructure offering optimal mechanical strength and corrosion resistance. As-rolled samples were characterized for their microstructures using optical microscopy, scanning electron microscopy, and x-ray diffraction. Mechanical properties were assessed through tensile and hardness tests. Corrosion behavior was analyzed using tafel polarization, linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) techniques. Mechanical testing results showed an increase in yield strength (YS) from 248 to 294&#xa0;MPa and ultimate tensile strength (UTS) from 262.4 to 304&#xa0;MPa, as the rolling temperature decreased from 520 to 480&#xa0;°C. This trend was also reflected in hardness measurements: hardness peaked at 56.9 HRB for the 480&#xa0;°C specimen and steadily decreased to 33.8 HRB for 520&#xa0;°C specimen. Dynamic recovery was considered as the primary softening mechanism arised during single-pass 74% reduction at 520&#xa0;°C, which refined the sub-grain structure and relieved internal stresses. It is concluded that combination of reduction and temperature coupled with the alloy’s composition, yields the optimal balance of mechanical and electrochemical performance.</p>

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Optimization of Microstructure for Improved Mechanical and Corrosion Performance through Controlled Composition and Hot Rolling of AA5052 Alloy

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Kashif Hasnain,
  • Muhammad Zarif,
  • Javed Kamran,
  • Zafar Iqbal,
  • M. T. Tanvir,
  • Zahid Asghar,
  • Jamil Ahmad

摘要

This study provides new insights into the role of compositional control and hot rolling parameters in optimizing the performance of AA5052 aluminum alloy. The alloy was homogenized at 560 °C for 20 hours followed by multi-pass and single-pass hot rolling with a rolling reduction of 74% at different temperatures (480, 490, 500, 510, and 520 °C). The objective was to achieve a balanced microstructure offering optimal mechanical strength and corrosion resistance. As-rolled samples were characterized for their microstructures using optical microscopy, scanning electron microscopy, and x-ray diffraction. Mechanical properties were assessed through tensile and hardness tests. Corrosion behavior was analyzed using tafel polarization, linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) techniques. Mechanical testing results showed an increase in yield strength (YS) from 248 to 294 MPa and ultimate tensile strength (UTS) from 262.4 to 304 MPa, as the rolling temperature decreased from 520 to 480 °C. This trend was also reflected in hardness measurements: hardness peaked at 56.9 HRB for the 480 °C specimen and steadily decreased to 33.8 HRB for 520 °C specimen. Dynamic recovery was considered as the primary softening mechanism arised during single-pass 74% reduction at 520 °C, which refined the sub-grain structure and relieved internal stresses. It is concluded that combination of reduction and temperature coupled with the alloy’s composition, yields the optimal balance of mechanical and electrochemical performance.