February 6
@
1:00 PM
–
2:00 PM
UW-Madison Department of Materials Science and Engineering welcomes Professor Maryam Ghazisaeidi. Their seminar on “Stability and properties of BCC-B2 refractory ‘high entropy’ alloys” will be on Thursday, Feb. 6 in MS&E 265 from 1 p.m. to 2 p.m.
Abstract
Enhancing energy efficiency requires the development of new materials suitable for high-temperature environments. Refractory multicomponent alloys with a BCC/B2 microstructure hold promise, as this structure, similar to the well-known γ/γ′ in superalloys but composed of refractory elements, could result in alloys capable of maintaining high strength at extremely high temperatures. Given the vast range of potential compositions in these alloys, a critical initial question is whether the B2 phase can form within refractory metals.
In this talk, I will discuss how we address this question using our newly developed Multi-Cell Monte Carlo (MC)² method, which is well-suited for predicting phase stability in multicomponent systems. Using this method, we explored the broad compositional space of these alloys, refined the ordering trends, and identified the most promising combinations for detailed analysis. Our findings reveal that B2 phases form specifically with the inclusion of elements from groups VII and VIII, such as Re and Ru. We then linked the phase stability in the favorable combinations to the bonding characteristics between these elements. Lastly, I will present the experimental efforts undertaken to validate some of these predictions.
Bio
Maryam Ghazisaeidi is a Distinguished Professor of Engineering and Professor of Materials Science and Engineering at The Ohio State University. She received her Ph.D. in Theoretical and Applied Mechanics from the University of Illinois at Urbana-Champaign, and her B.S and M.S. degrees from Sharif University of Technology in Tehran, Iran. Her research interest is in the area of computational materials science at the atomic scale with an emphasis on understanding the structure and chemistry of defects to predict novel material behavior. She has received the NSF CAREER award in 2015 and the AFOSR Young Investigator Program (YIP) award in 2017 and Computational Materials Science Rising Star award in 2020. She is an associate editor for Acta Materialia and Scripta Materialia and serves on the editorial boards of the Journal of Computational Materials Science and Journal of High Entropy Materials.