About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
A New Class of Hard and Ductile Materials in the Y-B System |
| Author(s) |
Joyce Kim, Salil Bavdekar, Jungsoo Kim, Gregory Stewart, Richard Hennig, Ghatu Subhash |
| On-Site Speaker (Planned) |
Joyce Kim |
| Abstract Scope |
Materials with high hardness and ductility have been highly sought after by materials scientists. While metals demonstrate high ductility but low hardness (<5 GPa), ceramics typically exhibit high hardness (>20 GPa for most structural ceramics) but low ductility. In this study, we serendipitously encountered a class of materials in the Y-B system exhibiting high hardness (comparable to structural ceramics) and, in some cases, noticeable ductility. Computational analysis using density functional theory (DFT) predicted that these materials exhibit superhard behavior. Using arc melting, we processed various thermodynamically stable compounds including YB2, YB4, YB6, YB12, and YB66. Through nano- and micro-indentation, we investigated the hardness and deformation mechanics of these materials. YB4 exhibited a hardness of ~25 GPa and demonstrated ductile features like extensive slip bands with no apparent cracks. This unusual combination of hardness and ductility is being investigated to gain an understanding of its bonding characteristics that influence these properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Modeling and Simulation, |