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<p>This study investigates the effects of individual rare earth (RE) elements (La, Ce) and mischmetal (MM) on the as-cast microstructure of near-eutectic Al-10RE alloys, along with the evolution of their microstructure and properties during high-temperature thermal exposure. The results indicate that the type of rare earth element not only influences the microstructure of each alloy but also significantly affects structural stability and property changes during thermal exposure. Among the tested alloys, the Al–La-based alloy exhibits the most superior overall performance. The as-cast alloy demonstrates an electrical conductivity of 28.46&#xa0;MS/m and a tensile strength of 171.3&#xa0;MPa at room temperature. During long-term thermal exposure at 400&#xa0;°C, this alloy maintains the best microstructural stability, with the lowest coarsening rate constant (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(K\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>K</mi> </math></EquationSource> </InlineEquation> = 29.1&#xa0;nm<sup>3</sup>/s). The differences in properties among the alloys are primarily attributed to the varying diffusion coefficients of rare earth atoms and the significant influence of rare earth element types on the solidification process of the alloy melt. This study offers additional insights that support future applications of Al–RE-based alloys in the field of high-temperature heat-resistant aluminum alloys.</p>

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Comparison of Microstructural and Mechanical Stabilities of Al-10RE(Ce/La/MM) Alloys Undergoing Thermal Exposure

  • 期刊论文

  • 发表日期：

    2025年12月7日

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  • Yueming Zhou,
  • Shougang Duan,
  • Linbo Chen,
  • Zhiyi He,
  • Jun Du

摘要

This study investigates the effects of individual rare earth (RE) elements (La, Ce) and mischmetal (MM) on the as-cast microstructure of near-eutectic Al-10RE alloys, along with the evolution of their microstructure and properties during high-temperature thermal exposure. The results indicate that the type of rare earth element not only influences the microstructure of each alloy but also significantly affects structural stability and property changes during thermal exposure. Among the tested alloys, the Al–La-based alloy exhibits the most superior overall performance. The as-cast alloy demonstrates an electrical conductivity of 28.46 MS/m and a tensile strength of 171.3 MPa at room temperature. During long-term thermal exposure at 400 °C, this alloy maintains the best microstructural stability, with the lowest coarsening rate constant ( \(K\) K  = 29.1 nm3/s). The differences in properties among the alloys are primarily attributed to the varying diffusion coefficients of rare earth atoms and the significant influence of rare earth element types on the solidification process of the alloy melt. This study offers additional insights that support future applications of Al–RE-based alloys in the field of high-temperature heat-resistant aluminum alloys.