About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Light Metal and Composites Technology
|
| Presentation Title |
Microstructure, Interfaces, and Mechanical Properties of Ceramic Matrix Composites |
| Author(s) |
Alex E. Moser, Ramasis Goswami |
| On-Site Speaker (Planned) |
Alex E. Moser |
| Abstract Scope |
Incorporation of B4C in metals and alloys is known to enhance the material specific strength and reduce density. A critical factor to improve the mechanical properties of these composites is the bonding strength of the metal/ceramic interface. We investigate the microstructure and interfacial characteristics of B4C-Ni and SiC-B4C composites processed in the solid state at relatively high pressure and low temperature using several methods. Improved hardness and modulus were observed in sintered B4C-Ni powder and attributed to the formation of Ni4B3 at the Ni/B4C interface. Fine probe EDS and HAADF revealed a Si rich intermixing layer at the SiC/B4C interface, which could enhance interfacial strength. The density functional theory (DFT) calculations show SiC-B4C (without intermixing) decohesion energy is the smallest at the interface as compared to the bulk SiC and B4C, and structural failure would occur along the interface. |