Abstract Herein, the influence of low-frequency alternating magnetic field (AMF) on hot tearing susceptibility of Mg-7Zn-1Cu-0.6Zr alloy was systematically studied by using a combination of experimental techniques and numerical simulations. The results reveal that the utilization of magnetic field during solidification decreased the hot tearing susceptibility (HTS) of Mg-7Zn-1Cu-0.6Zr alloy. The numerical simulation results indicated the existence of strong forced convection in the molten metallic pool during the solidification, resulting in a refined microstructure and uniform temperature field. In addition, the presence of magnetic field inhibited dendritic growth and delayed the coherence time of dendrites. Therefore, mass feeding time was decreased during the solidification, which led to reduced HTS. Furthermore, a near-spherical intermetallic compound of Mg-Zn-Cu was formed under the influence of applied magnetic field, which partly counteracted the contraction force during solidification due to its strong deformability and consequently enhanced the hot tearing resistance.

中文翻译：

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低频交变磁场对Mg-7Zn-1Cu-0.6Zr镁合金热裂敏感性的影响

摘要 本文结合实验技术和数值模拟，系统地研究了低频交变磁场(AMF)对Mg-7Zn-1Cu-0.6Zr合金热裂敏感性的影响。结果表明，在凝固过程中利用磁场降低了 Mg-7Zn-1Cu-0.6Zr 合金的热裂敏感性 (HTS)。数值模拟结果表明，金属熔池在凝固过程中存在强烈的强制对流，导致显微组织细化和温度场均匀。此外，磁场的存在抑制了枝晶生长并延迟了枝晶的相干时间。因此，在凝固过程中大量喂料时间减少，从而导致 HTS 降低。此外，