|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Mechanical Behavior and Degradation of Advanced Nuclear Fuel and Structural Materials
||Fiber/Matrix Debonding of SiC/SiC Composites Evaluated Using the Micropillar Compression
||Omer Karakoc, Takaaki Koyanagi, Takashi Nozawa, Yutai Katoh
|On-Site Speaker (Planned)
Micro-scale mechanical testing was employed to evaluate carbon interphase properties of silicon carbide fiber-reinforced SiC matrix (SiCf/SiCm) composites that play a key role in the overall mechanical behavior of the composite. To elucidate the optimum composite performance, we measured the interfacial mechanical properties of as-fabricated SiC/SiC composites with different fiber/matrix interface microstructures. Interface properties were determined using the slanted interface micro-pillar compression test, selecting micro-pillar specimens contained inclined carbon interphase interfaces. The interface properties and fracture behavior were explained as dependent on the microstructure of the interfaces as characterized by TEM and Raman spectroscopy. In addition, the micropillar test results were correlated with macroscopic mechanical properties of SiC/SiC composites neutron-irradiated at 300–500°C to ~10 displacements per atom in the High Flux Isotope Reactor. The analysis suggests that radiation effects, rather than interface debonding strength in the as-fabricated condition, are the dominant factor explaining radiation-induced degradation of the macroscopic properties.
||Mechanical Properties, Composites, High-Temperature Materials