|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||A novel approach to designing low-density CCAs exploiting multi-element eutectics
||Clemens Simson, Stefan Gneiger, Alexander Gro▀alber, Stefan Pogatscher
|On-Site Speaker (Planned)
In recent years, several multi-principle element alloys (MPEAs) and compositionally complex alloys (CCAs) have been derived from the high entropy concepts. Their often outstanding mechanical- and physical properties can be attributed to an intrinsic nanoscale microstructure. While many examples are shown for transition- or refractory metal-based systems, the concept of multi-principal element solid solutions could not be successfully transferred into light metal-based systems yet, due to their strong tendency to form ordered intermetallic phases.
In our work, we show that equilibrium sub-micron eutectic structures can be achieved in the vicinity of lower order invariant points of higher order systems. We suggest that this rescaling can be attributed to the inherent thermodynamic frustration compared to Gibbs’ rule of phases. Multiple examples of Al- and Mg- based ternary and quaternary compositions are given and compared against their respective CALPHAD predictions. Additionally, strategies for exploring higher-dimensional systems are discussed.
||High-Entropy Alloys, Other, Other