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<p>This study explores the evolution of γ′ precipitates in a Co-10Al-5W superalloy when subjected to temperatures of 900, 950 and 1000&#xa0;°C. The changes in shape, size and distribution of these precipitates were systematically analyzed using electron microscopy. Results indicate that the γ′ precipitates exhibit a cubic morphology and tend to coarsen progressively as temperature and aging duration increase. The coarsening kinetics were assessed through diffusion-based activation energy calculations, following the Lifshitz–Slyozov–Wagner theory. It was determined that the activation energy required for γ′ precipitate coarsening is 272&#xa0;kJ&#xa0;mol<sup>−1</sup>, and Al diffusion in the γ matrix plays a crucial role in this process. Additionally, the γ/γ′ interfacial energy at 1000&#xa0;°C was found to be 86&#xa0;mJ/m<sup>2</sup>. These findings contribute to the advancement of Co-based superalloys by providing essential insights into their thermal stability and high-temperature performance optimization.</p>

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Coarsening Behaviors of γ′ Particles in a Co-Al-W-Based Single-Crystal Alloy

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Lei Shi,
  • Fengjiao Guo,
  • Shuai Zhao,
  • Liming Lei,
  • Jinjiang Yu,
  • Xiaofeng Sun

摘要

This study explores the evolution of γ′ precipitates in a Co-10Al-5W superalloy when subjected to temperatures of 900, 950 and 1000 °C. The changes in shape, size and distribution of these precipitates were systematically analyzed using electron microscopy. Results indicate that the γ′ precipitates exhibit a cubic morphology and tend to coarsen progressively as temperature and aging duration increase. The coarsening kinetics were assessed through diffusion-based activation energy calculations, following the Lifshitz–Slyozov–Wagner theory. It was determined that the activation energy required for γ′ precipitate coarsening is 272 kJ mol−1, and Al diffusion in the γ matrix plays a crucial role in this process. Additionally, the γ/γ′ interfacial energy at 1000 °C was found to be 86 mJ/m2. These findings contribute to the advancement of Co-based superalloys by providing essential insights into their thermal stability and high-temperature performance optimization.