| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
Correlations between Nanoindentation Hardness and Composition Gradients in TaNbTiV Refractory High Entropy Alloy |
| Author(s) |
Thomas R. Bieler, Zackery L Thune, Chanho Lee, Peter K Liaw, Eugenia Nieto, Ignacio Escobar, Miguel Monclus, Jon Molina-Aldareguia |
| On-Site Speaker (Planned) |
Thomas R. Bieler |
| Abstract Scope |
Preparation of refractory high entropy alloys by melt solidification led to dendritic segregation. These concentration gradients provide a range of compositions that can be used to assess the mechanical properties as a function of composition using nanoindentation arrays. EBSD orientation maps combined with backscattered electron images show that each grain consists of its own dendrite, and grain boundaries consist of inter-dendritic zones. EDS shows that the Nb concentration varies slightly, but the Ta content is high when Ti and V is low, and vice versa, ranging from about 15-35% in a nominally equiatomic alloy. Hardness values track with dendrite composition, with softer values in Ta dendrite cores and harder values in the interdendritic regions, but hardness also depended on grain orientation and grain boundaries. Efforts to expand the range of composition dependent properties that can be assessed when the alloy is fabricated using elemental powders will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Solidification, High-Temperature Materials |