The growth mechanism of deoxidation particles during solidification and dispersion behavior in mircosegregation domain have been studied in the experiments where an Fe–10mass%Ni alloy deoxidized with Mg, Zr, Al, Ca or Mn/Si was cooled from 1873 to 1673 K at 50 K·min⁻¹, followed by rapid quenching. In a plot of the mean particle size versus time elapsed in liquid state and a plot of the number of particles per unit area versus time, the particle growth during cooling and subsequent solidification can be explained by Ostwald ripening. The Al₂O₃ particles are pushed to the region of final solidification at lower cooling rate, but the MgO and ZrO₂ particles are engulfed. Engulfment and pushing of particles are discussed based on the wetting/interfacial energy model and the critical velocity of particle engulfment and pushing transition.