Morphology evolution of primary Mg2Si in Ca-modified Al-Mg2Si alloy with various contents of Mg\Si

Combined influence of the Mg\Si and Ca contents on crystallization of primary Mg2Si in Al-Mg2Si alloy is investigated. Embryos formation of primary Mg2Si can be restricted by the addition of Ca while the restricted effect is weakened by increasing the content of Mg\Si, content of Ca for over-modification is increased with the Mg\Si content increasing. Growth of primary Mg2Si is encouraged with the content of Mg\Si increasing while the addition of Ca can restrict the growth rate directionally in Ca-modified Al-Mg2Si alloy, which leads to the morphology evolution of primary Mg2Si. The serious inhibition effect on the whole crystallization process of primary Mg2Si caused by increasing the content of Ca is the main reason for the occurrence of over-modification. Dice-like primary Mg2Si is prepared successfully in the over-modified alloy for the first time. Tip-growth process of the dice-like primary Mg2Si is revealed, which is completed by 2-D nucleation growth. The study provides a novel method to control the morphology and particle size of primary Mg2Si, which can further understand the crystallization process of the crystal.