|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Recent Developments in Biological, Structural and Functional Thin Films & Coatings
||Deformation, Failure and Fracture Mechanisms of ZrC-ZrB2 and Cu-ZrB2 Multilayered Nanostructures: An Atomistic Simulation Study
||Ashfaq Adnan, Md. Riaz Kayser, Krutarth Patel
|On-Site Speaker (Planned)
Because of their structural stability at temperature exceeding 2000 oC along with many excellent physical and mechanical properties, ultra-high-temperature structural ceramics (UHTCs) such as ZrB2-based ceramics are investigated for potential application as high-temperature coating materials. Here, using large scale atomistic simulation studies we have investigated ZrC-ZrB2 and Cu-ZrB2 multilayered nanostructures. The thickness of layers has been varied between 5 nm and 15 nm. The nominal grain size of ZrB2 is varied between 4 nm to 12 nm. We have chosen ZrC or Cu to interact with ZrB2 because these materials are known to increase oxidation resistance of ZrB2 at elevated temperature. Virtual tensile and shear tests are conducted at 300 K to 3000 K temperatures. Study has indicated that the mechanical properties and failure mechanism are greatly influenced by the grain boundaries of the ceramics. A theory has been proposed to describe the deformation and failure process.
||Planned: Supplemental Proceedings volume