|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Assessing the Fidelity of Thermodynamic Predictions for CrFeCoNi-based High Entropy Alloys
||Nicholas G. Jones, K A Christofidou, E J Pickering, H J Stone
|On-Site Speaker (Planned)
||Nicholas G. Jones
One of the key challenges currently facing the HEA field is the identification of promising compositions in a time efficient manner. One option is to utilise the CALPHAD method and commercial, HEA specific thermodynamic databases are now available. However, many potential compositions lie outside the assessed ranges of these databases and, therefore, at present, predictions need to be treated with caution. To assess the fidelity of the thermodynamic predictions, here we present the outcomes from a number of systematic studies that have established the phase equilibria in selected quinary and senary CrFeCoNi-based systems. Alloys were homogenised close to their solidus temperatures before undergoing long duration thermal exposures of at least 1000 hours at temperatures between 500 and 1000˚C. The resulting microstructures were characterised using advanced electron microscopy, X-ray diffraction and differential thermal analysis. The experimental results will be compared to the corresponding predictions from two different thermodynamic databases.