| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
ACerS Robert B. Sosman Award Symposium: Advancing the Science of Materials for Extreme Environments
|
| Presentation Title |
The Peculiarities of Deformation in Transition Metal Carbides |
| Author(s) |
Gregory B. Thompson, Christopher R. Weinberger |
| On-Site Speaker (Planned) |
Gregory B. Thompson |
| Abstract Scope |
Transition metal carbides comprise a class of high and ultrahigh melting temperature materials and depending upon temperature and phase type, brittle to significant plasticity responses is observed. This presentation will address the underlying deformation mechanisms as a function of the microstructure and crystallography found in group IVB and VB metal carbides. Specifically, how stacking fault energy differences in the metal-carbon bonding environment governs the energy hierarchy for slip. This information is applied to explain slip changes reported in the B1 group IVB and VB carbides, the anomalous hardening in sub-stoichiometric B1 group IVB and VB metal carbides, and the high fracture toughness found in tantalum-rich carbides but absent in other carbides. Finally, thermo-mechanical testing at temperatures in excess of 2500 deg. C, with the slip systems experimentally identified, will be described by the use of a non-contact loading method. |