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<p>Precise control of iron-containing phases is key to developing high-performance cast-rolled aluminum alloy sheets. This study investigates the effects of Mn and Zr on these phases in 6061 alloy. Adding 0.4 wt.% Mn raises the formation temperature of the AlFeMnSi phase, promoting the transformation from α-AlFeSi to AlFeMnSi. This increases the AlFeMnSi mass fraction from 0.07 to 0.624% while reducing α-AlFeSi from 0.13 to 0.04%. The combined addition of 0.3 wt.% Zr further refines the iron-containing phases, reducing their average size from 4.8 to 0.4&#xa0;μm. The mechanism involves Zr inhibiting Si diffusion. The adsorption energy of Al<sub>3</sub>Zr for Si (− 4.75&#xa0;eV) is higher than that of the θ-AlFe phase (− 4.62&#xa0;eV), reducing Si segregation in iron-containing phases and suppressing their continuous growth. Additionally, Al<sub>3</sub>Zr alters and inhibits the growth direction of AlFeMnSi, synergistically promoting refinement. Consequently, the synergistic microalloying of Mn and Zr yields the optimal mechanical properties: a yield strength of 109.3&#xa0;MPa, a tensile strength of 227.4&#xa0;MPa, and an elongation of 15.3%.</p>

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The Refinement Mechanism of Fe-Containing Phases in 6061 Aluminum Alloy Driven by Synergistic Mn and Zr Microalloying During Cast-Rolling

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Shuangyong Tian,
  • Ximin Zang,
  • Yuchong Sun,
  • Zhen Xu,
  • Tizhuo Jia,
  • Ruijue Wang

摘要

Precise control of iron-containing phases is key to developing high-performance cast-rolled aluminum alloy sheets. This study investigates the effects of Mn and Zr on these phases in 6061 alloy. Adding 0.4 wt.% Mn raises the formation temperature of the AlFeMnSi phase, promoting the transformation from α-AlFeSi to AlFeMnSi. This increases the AlFeMnSi mass fraction from 0.07 to 0.624% while reducing α-AlFeSi from 0.13 to 0.04%. The combined addition of 0.3 wt.% Zr further refines the iron-containing phases, reducing their average size from 4.8 to 0.4 μm. The mechanism involves Zr inhibiting Si diffusion. The adsorption energy of Al3Zr for Si (− 4.75 eV) is higher than that of the θ-AlFe phase (− 4.62 eV), reducing Si segregation in iron-containing phases and suppressing their continuous growth. Additionally, Al3Zr alters and inhibits the growth direction of AlFeMnSi, synergistically promoting refinement. Consequently, the synergistic microalloying of Mn and Zr yields the optimal mechanical properties: a yield strength of 109.3 MPa, a tensile strength of 227.4 MPa, and an elongation of 15.3%.