In this study, the inhomogeneous dealloying phenomenon during the liquid metal dealloying (LMD) was investigated using Fe₅₀Ni₅₀+Mg and (FeCo)₅₀Ni₅₀+Mg systems. For the Fe₅₀Ni₅₀+Mg system, the inhomogeneous dealloying and wetting of Mg melt occurred along triple junction (TJ) and grain boundary (GB). Temperature increase enhances the inhomogeneous dealloying kinetics and leads to the formation of the plate-shaped abnormal ligaments at the GB region. The energy banlance between a GB energy (γ_GB) and solid-liquid interface energies (γ_sl) is the key factor governing the inhomogeneous dealloying and wetting. Particularly, the low-energy twin boundaries were unaffected by the inhomogeneous dealloying. Therefore, precursor microstructure is an important factor determining the final morphology of dealloyed material as well as its physical properties. In the case of the (FeCo)₅₀Ni₅₀ precursor, all TJ and GB were stable against the preferred penetration of Mg melt from 600°C to 800°C. It was concluded that a minor addition of alloying elements (V or Cr) changes GB characteristics as well as γ_sl of the precursor alloy. Consequently, this significantly influences dealloying mechanisms and final morphology of the dealloyed material. The current findings demonstrate the importance of GB engineering in the precursor materials for the technological application of liquid metal dealloying for the synthesis of advanced structural and functional materials.

在这项研究中，使用 Fe ₅₀ Ni ₅₀ +Mg 和 (FeCo) ₅₀ Ni ₅₀ +Mg 系统研究了液态金属脱合金 (LMD) 过程中的不均匀脱合金现象。对于 Fe ₅₀ Ni ₅₀ +Mg 体系，Mg 熔体沿三联结 (TJ) 和晶界 (GB) 发生不均匀脱合金和润湿。温度升高增强了不均匀的脱合金动力学，并导致在 GB 区域形成板状异常韧带。GB 能量 (γ _GB ) 和固液界面能 (γ _sl )之间的能量平衡) 是控制不均匀脱合金和润湿的关键因素。特别是，低能孪晶边界不受非均匀脱合金的影响。因此，前驱体微观结构是决定脱合金材料最终形态及其物理性能的重要因素。在 (FeCo) ₅₀ Ni ₅₀ 前体的情况下，所有 TJ 和 GB 在 600°C 至 800°C 的 Mg 熔体的优选渗透中都是稳定的。得出的结论是，少量添加合金元素（V 或 Cr）会改变 GB 特性以及 γ _sl前体合金。因此，这会显着影响脱合金材料的脱合金机制和最终形态。目前的研究结果证明了 GB 工程在前体材料中的重要性，对于液态金属脱合金技术在先进结构和功能材料的合成中的应用。