About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
|
Presentation Title |
Dual Phase High Entropy Ultra High Temperature Ceramics from Commercial Powders |
Author(s) |
Rubia Hassan, Willaim G. Fahrenholtz, Kantesh Balani, Gregory E. Hilmas |
On-Site Speaker (Planned) |
Rubia Hassan |
Abstract Scope |
In this work, dual phase high entropy ceramics with and without SiC (HES and HE, respectively) were processed from commercial powders of ZrB2, HfB2, TiC, TaC, and WC in equimolar proportion using spark plasma sintering route. Micrographs reveal dense microstructure in HES while as submicron porosity in HE, preferentially in carbide phase. The samples did not reach chemical equilibrium under given sintering conditions resulting in inhomogeneous distribution of transition metals in both boride and carbide phases. Microhardness measurements performed at different loads (0.49N–9.8N) displayed indentation size effect, though HES exhibited higher hardness than HE at each load. |