Symposium SF06—High-Entropy and Compositionally Complex Alloys
High-entropy alloys (HEAs), or compositionally complex alloys (CCAs), consist of multiple principal elements in high concentrations. They occupy a vast unexplored space near the centers of phase diagrams where many new materials with potentially superior properties are waiting to be discovered. Some complex alloys are single-phase solid solutions and thus provide a platform to investigate the fundamental ways in which concentrated alloys are different from, or similar to, conventional alloys that contain just one or two principal elements. Others have multiphase microstructures that allow for the optimization of several properties simultaneously. There remain many fascinating and unanswered questions about how to quantify compositional complexity and its effects on basic structure-property relationships. While the vast compositional space available for HEAs/CCAs poses immense experimental and theoretical challenges, it also provides unprecedented chemical flexibility to deepen fundamental understanding and develop new materials.
This symposium focuses on both fundamental and practical aspects of HEAs and CCAs and their governing structure-property relationships. We solicit papers that address these issues using experimental and/or theoretical approaches. Of special interest are new developments in alloy design targeting properties beyond those possible with conventional alloys, as well as unique aspects of HEAs/CCAs attributable to their chemical and structural complexity.