High resolution in-situ study of the reactive element effect on high temperature alumina scale formation

Research Project, 2021 – 2025

The purpose is to understand the onset and evolution of alumina scales formed on FeCrAl alloys at elevated temperatures, by studying the oxidation “live” with atomic or nanometre resolution. By acquiring dynamic data, including crystal structure, chemistry and defect formation, we can formulate an oxidation model, which can be used to tailor-make materials with superior high temperature corrosion properties.
The specific aims are:Developing and using atomic and nanometre scale resolution techniques for studies of high temperature oxidation in-situ. We will use a combination of state-of-the-art techniques, smart experiments and methods.Understanding the early scale development. We will study the formation of the oxide scale, from monolayers, via nanolayers, to a “bulk-like” structure, including nucleation and growth of various phases and local phase transformations.Understanding the influence of REs on early scale growth. The influence of the small RE-particles is key to understanding the RE-effect, how it impacts growth, void formation, transient alumina nucleation and growth.Understanding the role of the surface. We will study samples with different surface facets, known to produce scales with very different quality.Establishing an alumina scale growth model. We will develop an improved oxidation model for alumina scales formed at high temperature together with our existing partners who are experts in thermodynamics and ab-initio modelling.