|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Accelerating EXAFS Analysis of SRO in HEAs: Challenges and Opportunities
||Howard Joress, Elaf Anber, Bruce Ravel, Jonathan Hollenbach, Mitra Taheri, Brian DeCost
|On-Site Speaker (Planned)
It has become clear that most HEAs are not completely disordered, with certain elements having a proclivity for bonding. Further, this short-range order can have a large effect on properties. Extended x-ray absorption fine structure (EXAFS) is a powerful tool for characterizing this disorder, however challenges exist in analysis of the data. In this talk we will describe in detail the difficulties inherent to applying EXAFS to HEAs, including low Z contrast, secondary phases, long-range order, and the large number of variables involved in the fits. We will also describe our efforts to accelerate EXAFS mapping and quantitative data analysis. To speed the acquisition of EXAFS data we demonstrate the use of on-the-fly unsupervised learning to select subsequent samples for measurement. We then demonstrate the use of modern statistical methods, including bayesian inference to quantify the short-range order.
||Planned: Metallurgical and Materials Transactions