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<p>In this research, Al–7Si–0.35Mg–2.7Cu–0.1B–xP alloys with varied concentrations of P were designed and fabricated. Following this, the alloy undergoes a two-stage annealing process. The findings reveal that the addition of B can eliminate the majority of columnar crystals in the primary α-Al matrix, effectively refining the grain structure. After the composite addition of 0.1&#xa0;wt% B and 0.04&#xa0;wt% P, there is a significant reduction in the aspect ratio of the eutectic Si phase. Furthermore, the annealing process results in the substantial dissolution of θ-Al<sub>2</sub>Cu, which then precipitates into fine Al–Si–Cu phases, evenly distributed within the α-Al matrix. This process also refines the morphology and size of Mg<sub>2</sub>Si and iron-rich phases. After the two-stage heat treatment, the tensile strength (UTS), yield strength (YS), and elongation (El) of the C4 alloy are recorded at 283.1&#xa0;MPa, 180.9&#xa0;MPa, and 8.0%.</p>

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Effect of Annealing on Microstructure and Properties of Al–Si–Mg–Cu–B–P Alloy

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • Linbo An,
  • Xiaodong Du,
  • Jinlong Kong,
  • Jiale Zheng

摘要

In this research, Al–7Si–0.35Mg–2.7Cu–0.1B–xP alloys with varied concentrations of P were designed and fabricated. Following this, the alloy undergoes a two-stage annealing process. The findings reveal that the addition of B can eliminate the majority of columnar crystals in the primary α-Al matrix, effectively refining the grain structure. After the composite addition of 0.1 wt% B and 0.04 wt% P, there is a significant reduction in the aspect ratio of the eutectic Si phase. Furthermore, the annealing process results in the substantial dissolution of θ-Al2Cu, which then precipitates into fine Al–Si–Cu phases, evenly distributed within the α-Al matrix. This process also refines the morphology and size of Mg2Si and iron-rich phases. After the two-stage heat treatment, the tensile strength (UTS), yield strength (YS), and elongation (El) of the C4 alloy are recorded at 283.1 MPa, 180.9 MPa, and 8.0%.