Scholarlink

<p>The effect of a traveling-wave magnetic field (TMF) at different excitation currents on the dendrite morphological evolution and mechanical properties of Al–7 wt&#xa0;pct Si alloy during solidification was investigated in the present study. An electromagnetic casting device was used to prepare the alloy casting. Numerical simulations were conducted to assess the influence of TMF on the Al–7 wt&#xa0;pct Si alloy, particularly in terms of the Lorentz force, Joule heating, melt convection, etc., under varying excitation current intensities. The results indicated that TMF-induced melt convection played a crucial role in dendrite morphological evolution and refinement. The optimal dendrite refinement and mechanical properties were achieved at a TMF current of 100 A. The ultimate tensile strength, elongation at break, and microhardness increased from 92.7&#xa0;MPa, 6.9 pct, and 50.5 MPa (values obtained without using TMF to 108.3&#xa0;MPa, 8.3 pct, and 60.75 MPa (values obtained using 100 A-TMF), respectively. Additionally, variations in magnetic free energy and magnetic pressure also influenced dendrite morphological evolution. These findings provide a theoretical basis for enhancing the quality and mechanical properties of castings.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of Convective-Thermal Coupling Mechanism on Dendrite Morphological Evolution of Al–7 Wt Pct Si Alloy Under Traveling-Wave Magnetic Field Casting

  • 期刊论文

  • 发表日期：

    2025年4月23日

查看全文
  • Si-Yao Liu,
  • Xin-Cheng Miao,
  • Ye Zhou,
  • Ji-Yu Zhao,
  • Xin-Gang Ai,
  • Sheng-Li Li

摘要

The effect of a traveling-wave magnetic field (TMF) at different excitation currents on the dendrite morphological evolution and mechanical properties of Al–7 wt pct Si alloy during solidification was investigated in the present study. An electromagnetic casting device was used to prepare the alloy casting. Numerical simulations were conducted to assess the influence of TMF on the Al–7 wt pct Si alloy, particularly in terms of the Lorentz force, Joule heating, melt convection, etc., under varying excitation current intensities. The results indicated that TMF-induced melt convection played a crucial role in dendrite morphological evolution and refinement. The optimal dendrite refinement and mechanical properties were achieved at a TMF current of 100 A. The ultimate tensile strength, elongation at break, and microhardness increased from 92.7 MPa, 6.9 pct, and 50.5 MPa (values obtained without using TMF to 108.3 MPa, 8.3 pct, and 60.75 MPa (values obtained using 100 A-TMF), respectively. Additionally, variations in magnetic free energy and magnetic pressure also influenced dendrite morphological evolution. These findings provide a theoretical basis for enhancing the quality and mechanical properties of castings.