Lee, BJ Wirth, BD Shim, JH Kwon, J Kwon, SC Hong, JH 2024-01-21T05:07:01Z 2024-01-21T05:07:01Z 2021-09-03 2005-05 2469-9950 https://pubs.kist.re.kr/handle/201004/136526 A modified embedded-atom method (MEAM) interatomic potential for the Fe-Cu binary system has been developed using previously developed MEAM potentials of Fe and Cu. The Fe-Cu potential was determined by fitting to data on the mixing enthalpy and the composition dependencies of the lattice parameters in terminal solid solutions. The potential gives a value of 0.65 eV for the dilute heat of solution and reproduces the increase of lattice parameter of Fe with addition of Cu in good agreement with experiments. The potential was used to investigate the primary irradiation defect formation in pure Fe and Fe-0.5 at. % Cu alloy by a molecular dynamics cascade simulation study with a PKA energy of 2 keV at 573 K. A tendency for self-interstitial atom-Cu binding, the formation of mixed (Fe-Cu) dumbbells and even Cu-Cu dumbbells was observed. Given a positive binding energy between Cu atoms and self-interstitials, Cu transport by an interstitial diffusion mechanism could be proposed to contribute to the formation of Cu-rich precipitates and irradiation-induced embrittlement in nuclear structural steels. English AMER PHYSICAL SOC MOLECULAR-DYNAMICS SIMULATION PRIMARY DAMAGE FORMATION DISPLACEMENT CASCADES COMPUTER-SIMULATION ALPHA-IRON POINT-DEFECTS FCC METALS COPPER ENERGY BCC Modified embedded-atom method interatomic potential for the Fe-Cu alloy system and cascade simulations on pure Fe and Fe-Cu alloys Article 10.1103/PhysRevB.71.184205 1 PHYSICAL REVIEW B, v.71, no.18 PHYSICAL REVIEW B 71 18 scie scopus 000230124100044 2-s2.0-33644505522 Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Materials Science Physics Article MOLECULAR-DYNAMICS SIMULATION PRIMARY DAMAGE FORMATION DISPLACEMENT CASCADES COMPUTER-SIMULATION ALPHA-IRON POINT-DEFECTS FCC METALS COPPER ENERGY BCC Fe-Cu Molecular dynamics Cascade simulation Interatomic potential Irradiation damage Modified embedded-atom method