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Abstract : Aging applies to the changes in microstructure and properties - mechanical and physical - with time when a material is exposed to high temperatures, high stresses, aggressive chemical environments, and high levels of radiation. The chapter is dedicated to present the microstructure evolution in the bulk, but also at the surface, due to oxidation, of bare and coated (e.g., nickel aluminide, MCrAlY overlay, and γ-γ' coatings) SX superalloys. The isotropic and directional coarsening phenomena are reported at high temperature and their dependence on the loading condition (i.e., uniaxial/multiaxial, tension/compression, creep/fatigue, and isothermal/nonisothermal), the plastic prestraining, and the length scale (micro- vs. meso-scale, viz. dendritic scale) is examined. Furthermore, the phase transformation of coatings due to selective oxidation and interdiffusion with the substrate is presented depending on the thermal conditions (isothermal versus thermal cycling), their chemistry, and that of the substrate. The effects of microstructure evolutions in the bulk and because of the coatings on the mechanical performance - mechanical behavior and lifetime - are discussed. © 2021 Elsevier Inc. All rights reserved.
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Submitted on : Wednesday, September 29, 2021 - 5:17:37 PM
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Jean-Briac Le Graverend, Damien Texier, Vincent Maurel. Aging. Nickel Base Single Crystals Across Length Scales, Elsevier, p. 223 - 257 (chap.08), 2021, 978-0-12-819357-0. ⟨10.1016/B978-0-12-819357-0.00016-0⟩. ⟨hal-03358966⟩



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