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- W2930605483 abstract "Abstract The deformation behavior of the three metal dodecaborides (YB 12 , ZrB 12 , and Zr 0.5 Y 0.5 B 12 ) is investigated using radial X‐ray diffraction under nonhydrostatic compression up to ≈60 GPa with a goal of understanding how bonding and metal composition control hardness. Zr 0.5 Y 0.5 B 12 , which has the highest Vickers hardness ( Hv = 45.8 ± 1.3 GPa at 0.49 N load), also shows the highest bulk modulus ( K 0 = 320 ± 5 GPa). The 0.49 N hardness for ZrB 12 and YB 12 are both lower and very similar, and both show lower bulk moduli ( K 0 = 276 ± 7 GPa, and K 0 = 238 ± 6 GPa, respectively). Differential stress is then measured to study the strength and strength anisotropy. Zr 0.5 Y 0.5 B 12 supports the highest differential stress, in agreement with its high hardness, a fact that likely arises from atomic size mismatch between Zr and Y combined with the rigid network of boron cages. The (200) plane for all samples supports the largest differential strain, while the (111) plane supports the smallest, consistent with the theoretically predicted slip system of {111} [ ]. Strain softening is also observed for ZrB 12 . Finally, the full elastic stiffness tensors for ZrB 12 and YB 12 are solved. ZrB 12 is the most isotropic, but the extent of elastic anisotropy for all dodecaborides studied is relatively low due to the highly symmetric boron cage network." @default.
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- W2930605483 date "2019-04-03" @default.
- W2930605483 modified "2023-10-16" @default.
- W2930605483 title "Radial X‐Ray Diffraction Study of Superhard Early Transition Metal Dodecaborides under High Pressure" @default.
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- W2930605483 doi "https://doi.org/10.1002/adfm.201900293" @default.
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