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<p>The effects of deformation reduction and annealing temperature on microstructural characteristics and mechanical properties of Al-27%Si alloy strips prepared by gas atomization and hot rolling were investigated. The strips exhibit fine and uniform microstructure, with Si particles displaying a narrow size distribution and an average particle size of only 3.61 ± 1.5&#xa0;μm. Neither deformation reduction nor annealing temperature significantly affects the size, distribution, and morphology of Si particles. However, fractured Si particles are observed when the deformation reduction reaches 80%. The tensile strength reaches a maximum value of 246.3&#xa0;MPa at a deformation reduction of 80%. The grain size of the Al matrix gradually increases with increasing annealing temperature; after annealing at 450&#xa0;°C, the average grain size reaches 12.2&#xa0;μm, representing a 45.2% increase compared to that after annealing at 400&#xa0;°C. Dislocation density decreases significantly with increasing annealing temperature, and a transition zone is observed at the interface between Al and Si. The strip annealed at 350&#xa0;°C for 1&#xa0;h exhibit excellent performance, achieving a tensile strength of 151.1&#xa0;MPa and elongation of 2.5%.</p>

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Microstructures and mechanical properties of hot-rolled and annealed Al-27%Si alloy strips

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Ziming Li,
  • Zixin Wu,
  • Xiaoying Zhang,
  • Yuting Gu,
  • Xiang Peng,
  • Richu Wang,
  • Zhiyong Cai

摘要

The effects of deformation reduction and annealing temperature on microstructural characteristics and mechanical properties of Al-27%Si alloy strips prepared by gas atomization and hot rolling were investigated. The strips exhibit fine and uniform microstructure, with Si particles displaying a narrow size distribution and an average particle size of only 3.61 ± 1.5 μm. Neither deformation reduction nor annealing temperature significantly affects the size, distribution, and morphology of Si particles. However, fractured Si particles are observed when the deformation reduction reaches 80%. The tensile strength reaches a maximum value of 246.3 MPa at a deformation reduction of 80%. The grain size of the Al matrix gradually increases with increasing annealing temperature; after annealing at 450 °C, the average grain size reaches 12.2 μm, representing a 45.2% increase compared to that after annealing at 400 °C. Dislocation density decreases significantly with increasing annealing temperature, and a transition zone is observed at the interface between Al and Si. The strip annealed at 350 °C for 1 h exhibit excellent performance, achieving a tensile strength of 151.1 MPa and elongation of 2.5%.