Formation of temperature-induced defects in the multiscale model of ceramic glazes sintering

The phase field models address the equilibrium and evolution of density fields in elemental systems or mixtures of atoms of different types. Suggested in present work multiscale approach presents a successful link between macroscopic heat transfer model of selective laser melting (sintering) and temperature sensitive phase field crystal model (PFC). The PFC is used in the present work for the study of the effect of thermal fluctuations on the crystalline structure and formation of defects during solidification. The defects density has a maximum as the laser beam speed increases, and its formation dynamics depends on the balance between noise-induced defects at high temperatures and annealing of defects during prolonged exposure at lower temperatures. Obtained cooling curves can be interpolated by a function dependent on the beam speed, and then introduced as the source condition to the microscopic two-mode PFC model with thermal fluctuations.