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Title: Strength, deformation, and equation of state of tungsten carbide to 66 GPa

Journal Article · · Acta Materialia

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:
Univ. of Illinois, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
NA0003975; AC02-06CH11357; EAR 1663442; EAR 1654687
OSTI ID:
1830374
Alternate ID(s):
OSTI ID: 1840908
Journal Information:
Acta Materialia, Vol. 220; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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