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<p>Macroscopic mechanical properties depend on microstructural states. Here, the deformation behavior of Ni-based superalloys around inclusions is analyzed under misfit strains and external loads using a phase-field model coupled with small-strain plasticity. A central inclusion in a matrix is subjected to uniaxial tensile loading. As the lattice misfit magnitude increases, tensile deformation lowers the macroscopic yield stress, strain hardening, and stress triaxiality. The model also predicts stress and strain accumulation around the inclusions, influenced by the misfit sign. Higher stress levels form near the top and bottom surfaces of the inclusions and tend to accumulate along the loading direction, thereby affecting microcracking.</p> Graphical abstract <p></p>

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Micromechanical model to study the deformation behavior and effect of misfits on mechanical properties in Ni-based superalloys—a phase-field approach

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • Gururaj Gopal Rao,
  • Victor R. Vasquez

摘要

Macroscopic mechanical properties depend on microstructural states. Here, the deformation behavior of Ni-based superalloys around inclusions is analyzed under misfit strains and external loads using a phase-field model coupled with small-strain plasticity. A central inclusion in a matrix is subjected to uniaxial tensile loading. As the lattice misfit magnitude increases, tensile deformation lowers the macroscopic yield stress, strain hardening, and stress triaxiality. The model also predicts stress and strain accumulation around the inclusions, influenced by the misfit sign. Higher stress levels form near the top and bottom surfaces of the inclusions and tend to accumulate along the loading direction, thereby affecting microcracking.

Graphical abstract