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Article

Cavity Nucleation and Growth in Nickel-Based Alloys during Creep

Institute of Materials Science, Joining and Forming, Graz University of Technology, Kopernikusgasse 24/1, 8010 Graz, Austria
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Academic Editors: Luca Esposito, Michele Perrella and Bolv Xiao
Materials 2022, 15(4), 1495; https://doi.org/10.3390/ma15041495
Received: 10 January 2022 / Revised: 8 February 2022 / Accepted: 15 February 2022 / Published: 17 February 2022
(This article belongs to the Special Issue Creep Behaviour and Life Assessment of Structural Materials)
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. View Full-Text
Keywords: creep cavitation; pore formation; pore growth; classical nucleation theory creep cavitation; pore formation; pore growth; classical nucleation theory
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MDPI and ACS Style

Meixner, F.; Ahmadi, M.R.; Sommitsch, C. Cavity Nucleation and Growth in Nickel-Based Alloys during Creep. Materials 2022, 15, 1495. https://doi.org/10.3390/ma15041495

AMA Style

Meixner F, Ahmadi MR, Sommitsch C. Cavity Nucleation and Growth in Nickel-Based Alloys during Creep. Materials. 2022; 15(4):1495. https://doi.org/10.3390/ma15041495

Chicago/Turabian Style

Meixner, Felix, Mohammad R. Ahmadi, and Christof Sommitsch. 2022. "Cavity Nucleation and Growth in Nickel-Based Alloys during Creep" Materials 15, no. 4: 1495. https://doi.org/10.3390/ma15041495

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