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<p>The α<sub>2</sub> + γ two-phase γ-TiAl alloys with full lamellar structure exhibit excellent mechanical properties, which are potential blade materials for aero-engines working under stress and high-temperature. In this study, the evolution and stability of nano-lamella under external stress in γ-TiAl alloys are investigated by using phase-field simulation. The application of external stress affects the chemical potential and the local composition across the γ/γ and α<sub>2</sub>/γ interfaces. The tensile stress quickens the lamellar splitting for the stress concentration within the γ lamella, and accelerates the diffusion-induced coarsening of the γ lamella to form thicker lamella. In contrast, the compressive stress inhibits the splitting and coarsening, and refines the γ lamella. The results reveal the thermo-mechanical coupling induced evolution of nano-lamella in the γ-TiAl alloys operating at high-temperature and external stress.</p>

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External stress driving lamellar evolution in γ-TiAl alloys

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Jicheng Zhuo,
  • Zan Zhang,
  • Ye Shan,
  • Haiwei Zhang,
  • Yongsheng Li

摘要

The α2 + γ two-phase γ-TiAl alloys with full lamellar structure exhibit excellent mechanical properties, which are potential blade materials for aero-engines working under stress and high-temperature. In this study, the evolution and stability of nano-lamella under external stress in γ-TiAl alloys are investigated by using phase-field simulation. The application of external stress affects the chemical potential and the local composition across the γ/γ and α2/γ interfaces. The tensile stress quickens the lamellar splitting for the stress concentration within the γ lamella, and accelerates the diffusion-induced coarsening of the γ lamella to form thicker lamella. In contrast, the compressive stress inhibits the splitting and coarsening, and refines the γ lamella. The results reveal the thermo-mechanical coupling induced evolution of nano-lamella in the γ-TiAl alloys operating at high-temperature and external stress.