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First-principles calculations have been performed to investigate energetics and site preference of carbon (C) in a tungsten (W) Σ5(310)/[001] grain boundary (GB). We calculate the solution energies of the C atom in the GB, which show that the interstitial C is energetically favored over the substitutional C. The segregation energy is calculated to be −3.95 eV for the energetically favorable GB interstitial...
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