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- W4366422914 abstract "Twin boundaries have been exploited to stabilize ultrafine grains and improve the mechanical properties of nanomaterials. The production of twin boundaries and nanotwins is however prohibitively challenging in carbide ceramics. Using scanning transmission electron microscopes as a unique platform for atomic-scale structure engineering, we demonstrate that twin platelets could be produced in carbides by engineering antisite defects. Antisite defects at metal sites in various layered ternary carbides are collectively and controllably generated and the metal elements are homogenized by electron irradiation, which transforms the twin-like lamellae into nanotwin platelets. Accompanying the chemical homogenization, <em>α</em>-Ti<sub>3</sub>AlC<sub>2</sub> transforms to unconventional<em> β</em>-Ti<sub>3</sub>AlC<sub>2</sub>. The chemical homogeneity and the width of the twin platelets can be tuned by the dose and energy of bombarding electrons. Chemically homogenized nanotwins can boost the hardness by ~45%. Our results provide a new way to produce ultrathin (<5 nm) nanotwin platelets in scientifically and technologically important carbide materials and showcase the feasibility of defect engineering by an angstrom-sized electron probe." @default.
- W4366422914 created "2023-04-21" @default.
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- W4366422914 date "2023-06-01" @default.
- W4366422914 modified "2023-10-18" @default.
- W4366422914 title "Electron-irradiation-facilitated production of chemically homogenized nanotwins in nanolaminated carbides" @default.
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- W4366422914 doi "https://doi.org/10.26599/jac.2023.9220757" @default.
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