| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
|
| Presentation Title |
Microwave Plasma as a Means to Create High Entropy Materials |
| Author(s) |
Shane Catledge, Bria Storr, Luke Moore, Cheng-Chien Chen |
| On-Site Speaker (Planned) |
Shane Catledge |
| Abstract Scope |
We demonstrate a unique approach to synthesis of high entropy materials, including borides and alloys, via microwave-induced plasma. This combines rapid microwave energy absorption with enhanced chemical kinetics afforded by a plasma discharge rich in atomic hydrogen. Thermal reduction of a five-component transition metal oxide powder mixture in a plasma reducing environment is efficiently performed as a single step. Density functional theory calculations of entropy forming ability descriptors are used to facilitate choice of precursors in order to obtain excellent hardness and oxidation resistance. Measurements of these properties reveal substantial improvement over their non-HE counterparts. Through combination of plasma reduction of metal oxide precursors with the benefits of rapid microwave heating, efficient synthesis and fine microstructural control of HE alloy and ceramic systems is realized. The plasma process does not rely on bulk melting (with associated phase segregation during solidification) but instead undergoes microwave sintering leading to single-phase microstructures. |