|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Combinatorial Exploration of High Entropy Alloys
||Sebastian Kube, Sungwoo Sohn, David Uhl, Amit Datye, Apurva Mehta, Jan Schroers
|On-Site Speaker (Planned)
High Entropy Alloys (HEAs) are inherently complex and span a vast composition space, across which single-phase solid solutions (SPSS) are potentially formed. Using combinatorial co-sputtering, high-throughput EDX, and synchrotron XRD, we consistently fabricate and characterize large numbers of distinct quinary HEAs. Thanks to the high cooling rates involved (~10^8 K/s), SPSS are obtained even for compositions which would not form SPSS under equilibrium conditions. By mining a first data set comprising ~2,500 quinary HEAs based on the elements Al/Cr/Mn/Fe/Co/Ni/Cu, we show that the solid solution structure is determined by the content of BCC/FCC elements and the atomic size difference. We further reveal a BCC preference effect: The BCC structure becomes increasingly favorable with increasing atomic size difference, because of its ability to accommodate atoms of various sizes more efficiently than FCC. Finally, we significantly expand the data set with new experimental data, covering additional elements and element combinations.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume