About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Real Time Imaging
|
Presentation Title |
In-situ Synchrotron 3D X-ray Imaging of Damage Initiation in CMC's Due to Oxidation Corrosion at High Temperature |
Author(s) |
Hrishi Bale, Aly Badran, David B. Marshall, Robert O. Ritchie |
On-Site Speaker (Planned) |
Hrishi Bale |
Abstract Scope |
Ceramic-matrix-composites (CMC’s) are being developed for service conditions of high temperatures and loads, well beyond the realm of current structural materials. Using various strategies and coatings with integral 3-D architectural designs, woven-CMCs make development of such ultrahigh-temperature structures feasible. Fracture assessment and lifetime prediction presents a formidable challenge, as reliable mechanical data and damage characterization must be achieved in 3-D at high temperatures. Using synchrotron X-ray micro-tomography to perform such characterization under load, oxidative environment and temperatures approaching 2000°C, we report here the contrasting damage modes in a woven SiC-fiber/SiC-matrix composite at high temperature. We observe for the first time in 3D, the degradation of BN interface and formation of damage initiation sites along the fiber-matrix interface layers. This ability to image complex 3-D materials undergoing failure at extreme temperatures opens new possibilities for evaluating CMC’s in real-time including the study of creep, load cycling and oxidation on the performance. |
Proceedings Inclusion? |
Planned: |