Instant-adding and instant-melting zinc-zirconium alloy modifier for modification treatment of die-cast zinc alloy and preparation method of instant-adding and instant-melting zinc-zirconium alloy modifier

The invention discloses an instant-adding and instant-melting zinc-zirconium alloy alterant for modification treatment of die-cast zinc alloy and a preparation method of the zinc-zirconium alloy alterant, and belongs to the technical field of alloy production. According to the alterant prepared through the method, Zr and Al form a large number of Al3Zr phases, non-uniform nucleation particles of a primary phase are increased, grain growth is hindered, an alpha-Al phase is preferentially nucleated, and the alpha-Al phase and a eutectic structure are promoted to uniformly grow, so that growth of a large block-shaped eta-Zn phase is inhibited, and the comprehensive mechanical property of the third die-cast zinc alloy can be remarkably improved. 本发明公开了一种压铸锌合金变质处理用即加即熔锌锆合金变质剂及其制备方法，属于合金生产技术领域。本发明制备的变质剂中Zr和Al形成大量的Al3Zr相，增加初生相的非均匀形核质点，阻碍晶粒长大，使α-Al相优先成核，促使α-Al相和共晶组织均匀生长，从而抑制了大块状η-Zn相的生长，能显著提高三号压铸锌合金的综合力学性能。