High/Medium entropy alloys (H/MEAs) represent a new strategy for the design of materials with properties superior to those of conventional alloys. Here, we show a new field of application where the uniform mixtures of multiple principal elements in H/MEAs is utilized to create new type nanoporous alloys by dealloying. By using equiatomic CrCoNi MEAs as a proto-type system, we developed three-dimensional bi-continuous open nanoporous CoCr alloys composed of single-phase solid-solution with equiatomic ratios by liquid-metal dealloying methods. The morphology and size of ligaments and pores could be tailored by controlling dealloying time. Structural evolution of the nanoporous CoCr alloy during dealloying can be well described by surface smoothening and ligament pinch-off mediated coarsening process. This study opens up a new promising pathway for development of new type nanoporous alloys-nanoporous high entropy alloys, which are expected to have unprecedented structural and functional properties due to a unique synergistic combination of nanoporous structure and high-entropy effect.

高/中熵合金（H / MEA）代表了一种设计性能优于常规合金的材料的新策略。在这里，我们展示了一个新的应用领域，其中通过在H / MEA中使用多个主要元素的均匀混合物，通过脱合金来制造新型纳米多孔合金。通过使用等原子态的CrCoNi MEA作为原型系统，我们通过液-金属脱合金方法开发了具有等原子比的单相固溶体组成的三维双连续开孔纳米多孔CoCr合金。韧带和孔的形态和大小可以通过控制脱合金时间来调整。纳米多孔CoCr合金在脱合金过程中的结构演变可以通过表面平滑和韧带夹断介导的粗化过程很好地描述。