A Cell-Automaton Model for Eutectic Growth of a Ternary Alloy System with a Dilute Third Element

A cell-automaton model for eutectic growth has been extended from a binary alloy case into a ternary alloy case with a dilute third element. Quasi-stable ranges with an oscillatory growth mode of lamellar spacings have been obtained for lower growth velocities which can be distinguished from unstable ranges of spacing. The lower limit of the quasi-stable range decreases with the increase of the growth velocities, and the range becomes narrower with the increase of the content of the third element. The upper growth temperatures of the quasi-stable pattern decrease compared with the liquidus temperatures with the increase of the growth velocity. The quasi-stable growth pattern might be an instability pattern which would develop into a cellular-eutectic growth if lamellar branching were possible. [doi:10.2320/matertrans.M2012147]