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Al-(Ce, LaAl-(Ce, La)) alloys are potential alternatives to Al-Si alloys for automotiveAutomotive and aerospace applications, offering strengthStrength retention up to 300 °C due to the excellent thermal stabilityThermal stability of Al₁₁(Ce, LaAl-(Ce, La))₃ as the primary strengthening phase. However, they show limited strengthStrength at room temperature and the origin of this limitation is poorly understood. In particular, it is unclear how the applied macroscopic stress is shared between the Al matrix and the Al₁₁(Ce, LaAl-(Ce, La))₃ phase, and how to increase the load sharing of (Ce, LaAl-(Ce, La))-containing phases without compromising ductility or high-temperature stability. This study investigated the load partitioning between the primary aluminiumAluminium crystals and the Al₁₁(Ce, LaAl-(Ce, La))₃ intermetallicIntermetallics particles in an Al-8(Ce, LaAl-(Ce, La)) alloy during uniaxial tensile testing. In-situ synchrotron X-ray diffraction was used to monitor the evolution of lattice strains, allowing the calculation of stress carried by the Al₁₁(Ce, LaAl-(Ce, La))₃. This methodology can now be used to investigate compositional and microstructural changes to the strengthening phase Al₁₁(Ce, LaAl-(Ce, La))₃, allowing modification effectiveness to be compared and quantified consistently.

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Phase-Averaged Stresses and Elastic Load Partitioning in an Al-8(Ce, La) Alloy Measured by In-Situ Synchrotron X-ray Diffraction Under Uniaxial Tensile Testing

  • 会议论文

  • 发表日期：

    2026年

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  • Ruining Jin,
  • Christina Reinhard,
  • Alessandro De Nardi,
  • Shikang Feng,
  • Thomas Zillhardt,
  • Patrick S. Grant,
  • Enzo Liotti

摘要

Al-(Ce, LaAl-(Ce, La)) alloys are potential alternatives to Al-Si alloys for automotiveAutomotive and aerospace applications, offering strengthStrength retention up to 300 °C due to the excellent thermal stabilityThermal stability of Al₁₁(Ce, LaAl-(Ce, La))₃ as the primary strengthening phase. However, they show limited strengthStrength at room temperature and the origin of this limitation is poorly understood. In particular, it is unclear how the applied macroscopic stress is shared between the Al matrix and the Al₁₁(Ce, LaAl-(Ce, La))₃ phase, and how to increase the load sharing of (Ce, LaAl-(Ce, La))-containing phases without compromising ductility or high-temperature stability. This study investigated the load partitioning between the primary aluminiumAluminium crystals and the Al₁₁(Ce, LaAl-(Ce, La))₃ intermetallicIntermetallics particles in an Al-8(Ce, LaAl-(Ce, La)) alloy during uniaxial tensile testing. In-situ synchrotron X-ray diffraction was used to monitor the evolution of lattice strains, allowing the calculation of stress carried by the Al₁₁(Ce, LaAl-(Ce, La))₃. This methodology can now be used to investigate compositional and microstructural changes to the strengthening phase Al₁₁(Ce, LaAl-(Ce, La))₃, allowing modification effectiveness to be compared and quantified consistently.