| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Thermodynamics of Materials in Extreme Environments
|
| Presentation Title |
Strength, Deformation, and Equation of State of Tungsten Carbide to 66 GPa |
| Author(s) |
Benjamin L. Brugman, Feng Lin, Mingda Lv, Curtis Kenney-Benson, Dmitry Popov, Lowell Miyagi, Susannah Dorfman |
| On-Site Speaker (Planned) |
Benjamin L. Brugman |
| Abstract Scope |
Tungsten carbide exhibits remarkable physical properties including high strength and incompressibility, making it useful for industrial applications. Yet the bulk modulus of WC is discrepant by 120 GPa and its quasi-static strength and deformation mechanisms have not been studied at high pressure. We used synchrotron X-ray diffraction at the Advanced Photon Source Sector 16 to study bulk and nano-grain WC compressed to 66 GPa in the diamond anvil cell. Bulk WC is stiffer than nano WC, with respective bulk moduli of K<sub>0</sub> = 397 ± 7 and 377 ± 7 GPa and K<sub>0</sub>’ = 3.3 ± 0.3 and 3.8 ± 0.3. Strength and plasticity were determined from lattice strain and preferred orientation. Slip mechanisms were determined by Elasto-viscoplastic self-consistent simulations of experimental strain and texture. Yielding at ~30 GPa is accommodated by prismatic slip, at which pressure WC sustains 12-16 GPa differential stress, with pyramidal slip activated at ~40 GPa. |