Mechanical properties of thermally grown submicron oxide layers on a nickel-based superalloy

Nickel-based superalloys are frequently used under operating conditions that lead to the formation of an oxide layer. In this study, the mechanical properties of such a submicron oxide scale formed on a nickel-based superalloy were evaluated. The Poisson’s ratio and Young’s modulus of the layered oxide structure were determined to be respectively 0.29, and 259 GPa. Depth-resolved residual stress profiling with nanoscale resolution showed the presence of large compressive residual stresses up to 3000 MPa in the oxide, with magnitude correlated to the oxide scale thickness. The relevance of the results to the crack initiation and growth behaviour is discussed.


Publié dans:
Corrosion Science, 108388
Année
Dec 14 2019
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 Notice créée le 2019-12-17, modifiée le 2019-12-17

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