| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
Mechanical Properties of Nanocrystalline High-entropy Alloys Produced By High-pressure Torsion |
| Author(s) |
Benjamin Schuh |
| On-Site Speaker (Planned) |
Benjamin Schuh |
| Abstract Scope |
Equiatomic high-entropy alloys , namely CrMnFeCoNi, CrCoNi as well as TiZrNbHfTa are processed by high-pressure torsion in order to achieve a nanocrystalline (NC) microstructure and subsequently annealed (t = 1 h) for temperatures between 300°C to 1000°C. The aim of the investigation is twofold: to analyse the microstructure stability and to study the impact of possible phase decompositions on the mechanical properties. Therefore microstructural analysis was performed and microstructure-property relationships were established via subsequent tensile tests. The thermodynamic instability of the face-centered-cubic CrMnFeCoNi and the body-centered-cubic TiZrNbHfTa alloys will be highlighted and the profound changes of their mechanical properties, caused by the formation of second phases, will be discussed. Lastly, a strategy to circumvent the problem of low ductility via bimodal grain size engineering in the NC CrCoNi will be presented, where tensile ductility could be improved to 10% while still retaining ultra-high strengths of 1.5 GPa. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |