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Nano- and Microstructural Evolution in Ni- and Co-based Single Crystal Superalloys

Eggeler, Yolita M.

Abstract:
The present work uses advanced analytical transmission electron microscopy (TEM) to analyze elementary processes, which govern the microstructural evolution in the γ/γ’-microstructures of Ni- and Co-base superalloy single crystals (SX). Many critical micro-structural processes which govern SX behavior occur on a sub-micrometer scale. Therefore, TEM is required to explore them. TEM can provide microstructural, crystallographic and chemical information and in this respect outperforms other methods like APT (provides only chemical and microstructural information of tiny volumes) and all diffraction methods (provide only crystallographic information). For a good understanding of SX, it is important to explore how microstructures and thermodynamic equilibria are kinetically established. It is equally important, to correctly interpret the role which crystal defects like dislocations and planar faults play during high temperature plasticity. In the present work TEM has been applied to contribute to both fields.
In the thermodynamic/kinetic part of the present work on a Ni-base superalloy, a close to equilibrium reference state was produced by long term annealing experiments (850°C, 100 h). ... mehr



Zugehörige Institution(en) am KIT Laboratorium für Elektronenmikroskopie (LEM)
Publikationstyp Hochschulschrift
Publikationsjahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000125875
Verlag Friedrich-Alexander-Universität
Umfang 206 S.
Art der Arbeit Dissertation
Prüfungsdaten Erlangen-Nürnberg, Univ., Diss., 2019
Referent/Betreuer S. Virtanen
Externe Relationen Abstract/Volltext
Schlagwörter Superalloys, Transmission Electron Microscopy, In-situ TEM heating, Thermodynamics, Diffusion, Defect analysis, Segregation
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