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- W3194671256 abstract "We report on the mechanical responses of NbC(001) single-crystals subjected to nanoindentation and in situ scanning electron microscopy based uniaxial microcompression tests at room-temperature. Using X-ray diffraction and X-ray photoelectron spectroscopy, we determine that the as-purchased bulk NbC is a 001-oriented B1-structured single-crystal with lattice parameter of 0.4446 ± 0.0002 nm and C/Nb ratio of ~0.99. From nanoindentation experiments performed on the bulk crystal using a Berkovich diamond indenter, we measure an elastic modulus of 495 ± 14 GPa and an indentation-depth (h) dependent hardness decreasing from 31.0 ± 1.2 GPa at h = 0.2 µm to 26.4 ± 0.4 GPa at h = 0.9 µm. During uniaxial compression of cylindrical pillars with top diameters D between ~0.25 µm and ~0.75 µm, we observe strain hardening, increasing yield strengths with decreasing D, and surprisingly extensive plastic deformation with strains exceeding 2% and up to 30% in larger-size pillars. Electron microscopy characterization of the compressed pillars reveal slip traces characteristic of {110}〈1‾10〉 and {111}〈1‾10〉 slip systems. We suggest that the unexpected activation of {111}〈1‾10〉 facilitates plasticity in NbC(001)." @default.
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- W3194671256 date "2021-01-01" @default.
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- W3194671256 title "Room-Temperature Plasticity and Size-Dependent Mechanical Responses in Small-Scale B1-NbC(001) Single-Crystals" @default.
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- W3194671256 doi "https://doi.org/10.2139/ssrn.3906847" @default.
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