Abstract Liquid metal dealloying is a promising technique for synthesizing non-noble porous materials by preventing oxidation in a metallic melt. This method considers the heats of mixing between precursor elements and a melt element to design miscible and immiscible elements for a precursor. In this study, Ni and Co were selected as the miscible elements in an Mg melt as constituents of (FeCo)100−xNix precursor alloys to understand the complex mechanisms of their dissolution behavior. Dissolution of the second miscible element, Co, was governed by the composition of the Mg melt, because the characteristics of the melt changed in the presence of a high amount of dissolved Ni and its convection. The synthesized FeCo ligaments showed morphology variations depending on the dealloying temperature: the ligaments become more elongated along the dealloying direction at higher temperatures. A double-gyroid-like porous structure with a narrow liquid channel, produced from the (FeCo)70Ni30 precursor, exhibited the highest specific surface area at all processing temperatures from 600 °C to 800 °C. This structure differed completely from that of the typical porous Fe80Cr20 alloy produced under the same liquid metal dealloying conditions. Elongation resulted from time-dependent directional coarsening behavior that was affected by the composition of the Mg melt.

中文翻译：

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通过液态金属脱合金开发多孔 FeCo：多孔形态的演变和韧带与熔体之间相互作用的影响

摘要 液态金属脱合金是一种通过防止金属熔体氧化来合成非贵重多孔材料的有前途的技术。该方法考虑了前体元素和熔融元素之间的混合热，以设计前体的混溶和不混溶元素。在这项研究中，Ni 和 Co 被选为 Mg 熔体中的混溶元素，作为 (FeCo)100-xNix 前体合金的成分，以了解其溶解行为的复杂机制。第二个可混溶元素 Co 的溶解受 Mg 熔体的成分控制，因为在大量溶解的 Ni 及其对流的存在下熔体的特性发生了变化。合成的 FeCo 韧带显示出取决于脱合金温度的形态变化：在较高温度下，韧带沿脱合金方向变得更加伸长。由 (FeCo)70Ni30 前驱体制成的具有狭窄液体通道的双螺旋形多孔结构在 600°C 至 800°C 的所有加工温度下均表现出最高的比表面积。这种结构与在相同液态金属脱合金条件下生产的典型多孔 Fe80Cr20 合金完全不同。伸长率是由受镁熔体成分影响的随时间变化的定向粗化行为引起的。这种结构与在相同液态金属脱合金条件下生产的典型多孔 Fe80Cr20 合金完全不同。伸长率是由受镁熔体成分影响的随时间变化的定向粗化行为引起的。这种结构与在相同液态金属脱合金条件下生产的典型多孔 Fe80Cr20 合金完全不同。伸长率是由受镁熔体成分影响的随时间变化的定向粗化行为引起的。