The high-entropy alloy (HEA) design strategy is effective for ultra-coarsening-resistant 3D interconnected materials developed by liquid metal dealloying (LMD). However, the fundamental understanding of the dealloying mechanism and structural evolution of multi-principal elements 3D structured materials is still missing. In this study, the microstructural evolutions of 3D interconnected HEAs in Mg matrix were investigated using two types of multiphase precursors, namely, arc-melted and homogenized ones. The precursors' microstructure greatly influences dealloying kinetics and dealloying mechanisms what, in its turn, determines the final morphology of the 3D interconnected HEAs in Mg matrix. First, the prior fcc phase was dealloyed faster than any other precursor phases at dealloying temperatures from 600 to 900 °C. Second, the dealloying kinetics was faster along precursor grain boundaries (GB) as compared with grain interior. This led to the formation of a unique layered composite structure due to the inhomogeneous dealloying along the fine lamellars’ GB of the homogenized precursor. Moreover, governing orientation relationship between precursor and dealloying product depends on the LMD conditions, and it significantly affects the 3D interconnected grain structure. The fundamental understanding of the dealloying mechanisms will pave the way for customized morphology design of the 3D interconnected HEAs in metallic matrix with improved thermal stability and physical properties.

高熵合金 (HEA) 设计策略对于通过液态金属脱合金 (LMD) 开发的超抗粗化 3D 互连材料是有效的。然而，对多主元 3D 结构材料的脱合金机制和结构演化的基本理解仍然缺乏。在这项研究中，使用两种类型的多相前驱体，即电弧熔化和均质化前驱体，研究了镁基体中 3D 互连 HEAs 的微观结构演变。前驱体的微观结构极大地影响了脱合金动力学和脱合金机制，进而决定了 Mg 基体中 3D 互连 HEAs 的最终形态。一、先验fcc在 600 至 900 °C 的脱合金温度下，相的脱合金速度比任何其他前体相都快。其次，与晶粒内部相比，沿前体晶界 (GB) 的脱合金动力学更快。由于沿均匀前体的细层状 GB 的不均匀脱合金，这导致形成独特的层状复合结构。此外，前驱体和脱合金产品之间的取向关系取决于 LMD 条件，它显着影响 3D 互连晶粒结构。对脱合金机制的基本理解将为金属基体中 3D 互连 HEA 的定制形态设计铺平道路，并具有更高的热稳定性和物理性能。