About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Environmental Degradation of Multiple Principal Component Materials
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Presentation Title |
Insights into Defects and Failure of Multi-component Ultra-high Temperature Carbides |
Author(s) |
Ambreen Nisar, Sohail M. A. K. Mohammed, Gia Garino, Brandon Aguiar, Arvind Agarwal |
On-Site Speaker (Planned) |
Ambreen Nisar |
Abstract Scope |
Solid-Solutioning in multi-component ultra-high temperature ceramics (MC-UHTCs) has shown to improve their thermo-mechanical properties unattainable by conventional UHTCs. Herein, MC-UHTCs are synthesized by varying the components from monoliths to binary up to quaternary in (Ta,Nb,Hf,Ti)C UHTC system using spark plasma sintering (SPS). The fracture strength of the samples were measured using a 4-point bend test with high-speed camera visualization on the failure behavior of MC-UHTCs. The quaternary UHTC exhibited the highest fracture strength, with ~227% and ~10% improvement over binary and ternary samples, respectively. Enhancement in the strength of MC-UHTCs is attributed to processing induced defects (such as dislocations, twinning, stacking faults), as revealed by high-resolution transmission electron microscopy (HR-TEM). Identification of elusive real-time quantitative failure events in MC-UHTCs via cracking recorded with high frame rate videos, and quantification of crack propagation rate. Succeeding in the approach will provide new opportunities in the compositional space of MC-UHTCs with tailored properties. |
Proceedings Inclusion? |
Planned: |
Keywords |
Ceramics, High-Temperature Materials, Mechanical Properties |