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<p>This study investigates the influence of Praseodymium (Pr) additions (0.0–1.0 wt.%) on the solidification and microstructure of a cast Al–Zn–Mg–Cu alloy. The alloys were characterized using thermal analysis, differential scanning calorimetry (DSC), x-ray diffraction (XRD), and microscopy (optical microscopy (om) and scanning electron microscopy with energy-dispersive spectroscopy (SEM–EDS)). Thermal analysis revealed that increasing Pr content resulted in a progressive decrease in the liquidus temperature and reduced undercooling, indicating Pr-rich phases act as potent nucleating agents. Significant grain refinement was observed with increasing Pr addition. EDS analysis confirmed the formation of Pr-rich intermetallics in interdendritic regions, with their area fraction increasing with Pr content. The composition of these intermetallics evolved from Pr–Fe phases at 0.2 wt.% Pr to complex Pr–Cu–Zn phases at higher concentrations. The DSC curves reflected these phase changes. These findings show Pr effectively modifies the alloy’s solidification pathway and microstructure, offering a potential route to tailor its properties. In summary, this research demonstrates that Praseodymium is an effective microalloying element for refining the as-cast microstructure of Al–Zn–Mg–Cu alloys. The refinement is achieved through the formation of Pr-rich intermetallic compounds that promote heterogeneous nucleation, offering a potential route to tailor the alloy's final properties.</p>

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Solidification Modification and Microstructural Evolution of Al–Zn–Mg–Cu Alloy with Praseodymium Additions

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • M. G. Mahmoud,
  • Ahmed O. Mosleh,
  • S. Salem,
  • Olga A. Yakovtseva,
  • Waleed. Khalifa,
  • Andrey V. Pozdniakov,
  • Mohamed A. Afifi

摘要

This study investigates the influence of Praseodymium (Pr) additions (0.0–1.0 wt.%) on the solidification and microstructure of a cast Al–Zn–Mg–Cu alloy. The alloys were characterized using thermal analysis, differential scanning calorimetry (DSC), x-ray diffraction (XRD), and microscopy (optical microscopy (om) and scanning electron microscopy with energy-dispersive spectroscopy (SEM–EDS)). Thermal analysis revealed that increasing Pr content resulted in a progressive decrease in the liquidus temperature and reduced undercooling, indicating Pr-rich phases act as potent nucleating agents. Significant grain refinement was observed with increasing Pr addition. EDS analysis confirmed the formation of Pr-rich intermetallics in interdendritic regions, with their area fraction increasing with Pr content. The composition of these intermetallics evolved from Pr–Fe phases at 0.2 wt.% Pr to complex Pr–Cu–Zn phases at higher concentrations. The DSC curves reflected these phase changes. These findings show Pr effectively modifies the alloy’s solidification pathway and microstructure, offering a potential route to tailor its properties. In summary, this research demonstrates that Praseodymium is an effective microalloying element for refining the as-cast microstructure of Al–Zn–Mg–Cu alloys. The refinement is achieved through the formation of Pr-rich intermetallic compounds that promote heterogeneous nucleation, offering a potential route to tailor the alloy's final properties.