Cavity Nucleation and Growth in Nickel-Based Alloys during Creep

Felix Meixner*, Mohammad Reza Ahmadi, Christof Sommitsch

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The number of fossil fueled power plants in electricity generation is still rising, making improvements to their efficiency essential. The development of new materials to withstand the higher service temperatures and pressures of newer, more efficient power plants is greatly aided by physics-based models, which can simulate the microstructural processes leading to their eventual failure. In this work, such a model is developed from classical nucleation theory and diffusion driven growth from vacancy condensation. This model predicts the shape and distribution of cavities which nucleate almost exclusively at grain boundaries during high temperature creep. Cavity radii, number density and phase fraction are validated quantitively against specimens of nickel-based alloys (617 and 625) tested at 700 °C and stresses between 160 and 185 MPa. The model’s results agree well with the experimental results. However, they fail to represent the complex interlinking of cavities which occurs in tertiary creep.
Original languageEnglish
Article number1495
Issue number4
Publication statusPublished - 1 Feb 2022


  • Classical nucleation theory
  • Creep cavitation
  • Pore formation
  • Pore growth

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)


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