|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Progress in the Development of Refractory High Entropy Alloys within the System Ta-Mo-Cr-Ti-Al
||Bronislava Gorr, Steven Schellert, Stephan Laube, Alexander Kauffmann, Martin C. Heilmaier, Hans Juergen Christ
|On-Site Speaker (Planned)
Refractory high entropy alloys (RHEA) are considered as perspective new materials for applications at ultra-high temperatures. The research on RHEA in last years has, however, shown that it is an enormous scientific challenge to combine properties such as high creep resistance, reasonable ductility, reliable corrosion resistance and low density in one alloy. In this respect, the progress in the development of RHEA within the system Ta-Mo-Cr-Ti-Al will be shown in this work. It was found that Ta-, Mo- and Ti-rich alloys, e.g. equiatomic Ta-Mo-Ti, with a single body centered cubic A2 microstructure exhibit good mechanical properties, i.e. high creep resistance and ductility at room temperature, while some multiphase (B2+Laves) Cr-rich materials, e.g. equiatomic Ta-Mo-Cr-Ti-Al possess unexpectedely high oxidation resistance. Recent experimental results on non-equiatomic alloys with both single- A2 or multiphase (A2+B2) microstructures show that the combination of properties mentioned above can be achieved by sensitive changing the chemical composition.