Strength, deformation, and equation of state of tungsten carbide to 66 GPa
Journal Article
·
· Acta Materialia
- Michigan State Univ., East Lansing, MI (United States); Arizona State Univ., Tempe, AZ (United States); University of Illinois - Chicago
- Univ. of Utah, Salt Lake City, UT (United States)
- Michigan State Univ., East Lansing, MI (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
Here, strength, texture, and equation of state of hexagonal tungsten monocarbide (WC) have been determined under quasi-hydrostatic and non-hydrostatic compression to 66 GPa using angle-dispersive X-ray diffraction in the diamond anvil cell. Quasi-hydrostatic compression in a Ne pressure medium demonstrates that nanocrystalline WC is slightly less incompressible than bulk-scale WC, with respective bulk moduli of K0 = 377 ± 7 and 397 ± 7 GPa and pressure derivatives K0’ = 3.8 ± 0.3 and 3.7 ±0.3. This decrease in incompressibility with grain size is similar to behavior observed in other ceramics. Under nonhydrostatic compression, WC supports a mean differential stress of ~12-15 GPa at plastic yielding, which occurs at ~30 GPa. Strength in WC is anisotropic, with the (001) plane supporting 29-42% higher stress than stresses calculated from mean strain. Simulations using an Elasto-ViscoPlastic Self-Consistent model indicate that strength inferred from lattice strain theory may be overestimated due to effects of plastic deformation. Plastic deformation generates a texture maximum near $$\langle\bar{2}110\rangle$$ in the compression orientation, initially through prismatic slip on the {$$10\bar{1}0$$}$$\langle\bar{1}2\bar{1}0\rangle$$ and {$$10\bar{1}0$$}$$\langle0001\rangle$$ slip systems, followed by activation of pyramidal slip on {$$10\bar{1}1$$}$$\langle\bar{2}113\rangle$$ at ~40-50 GPa.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Illinois, Chicago, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- Grant/Contract Number:
- AC02-06CH11357; NA0003975
- OSTI ID:
- 1830374
- Alternate ID(s):
- OSTI ID: 1840908
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Vol. 220; ISSN 1359-6454
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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