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<p>This study investigates the effects of varying Eu content on the microstructure of A390 alloy. Samples are analyzed using optical microscopy (OM), scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), and electron probe microanalysis (EPMA). Microstructural observations reveal that a 0.6% Eu addition achieves dual modification of both primary and eutectic silicon in A390 alloy. Under as-cast conditions, primary silicon particles are refined and passivated, and eutectic silicon assumes a fibrous morphology. After T6 heat treatment, primary silicon particles become more passivated, and eutectic silicon transformed into granular structure. Additionally, the best refinement and fragmentation of intermetallic Al–Si–Fe–Mn phases and Al<sub>2</sub>Cu phases are achieved, respectively. The EPMA results are indicative of a preference for Eu deposition within the primary silicon. The EBSD results also show that the addition of 0.6% Eu results in a significant increase in the twinning density in the primary silicon and a decrease in the orientation strength.</p>

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The Effect of Eu and T6 heat treatment on Microstructure of A390 Alloys

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • Feng Mao,
  • Longbo Zhang,
  • Junliang Guo,
  • Songhao Liu,
  • Anzu Guo,
  • Chong Chen,
  • Cheng Zhang,
  • Changji Wang,
  • Shizhong Wei

摘要

This study investigates the effects of varying Eu content on the microstructure of A390 alloy. Samples are analyzed using optical microscopy (OM), scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), and electron probe microanalysis (EPMA). Microstructural observations reveal that a 0.6% Eu addition achieves dual modification of both primary and eutectic silicon in A390 alloy. Under as-cast conditions, primary silicon particles are refined and passivated, and eutectic silicon assumes a fibrous morphology. After T6 heat treatment, primary silicon particles become more passivated, and eutectic silicon transformed into granular structure. Additionally, the best refinement and fragmentation of intermetallic Al–Si–Fe–Mn phases and Al2Cu phases are achieved, respectively. The EPMA results are indicative of a preference for Eu deposition within the primary silicon. The EBSD results also show that the addition of 0.6% Eu results in a significant increase in the twinning density in the primary silicon and a decrease in the orientation strength.