Atomistic simulations of solidification process in B2-LiPb solid(001)-liquid system

•The effect of solid-liquid interface on the solidification of alloy was studied in detail.•Nonequilibrium concentration point defects were detected in the solidified crystal.•The formation of dominant point defects was dominated by atomic defect formation energy.•The moving velocity of solid-liquid interface in our case increased with thermostat undercooling degree. Li-Pb alloy is considered as a candidate for a blanket material in fusion reactors for its excellent physical and chemical properties. In this work, the solidification process in the B2-LiPb solid(001)-liquid system is studied using molecular dynamics (MD) simulations. The results indicate that the liquid phase atoms near the solid-liquid interface separate according to the crystal structure, and the separated atoms constitute (001) crystal planes through an ordering arrangement, which induces the B2-LiPb crystal to grow layer by layer. The velocity of moving solid-liquid interface in our case increases with the degree of thermostat undercooling. Nonequilibrium concentrations of point defects and a misshapen region are observed in the finally solidified crystal. The formation of the dominant point defect is dominated by defect formation energy. Additionally, Pb atoms are enriched in the misshapen region due to the formation of nonequilibrium concentrations of point defects.