Preparation of nanoporous CoCr alloy by dealloying CrCoNi medium entropy alloys
Preparation of nanoporous CoCr alloy by dealloying CrCoNi medium entropy alloys
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DOI：
10.1016/j.jmrt.2020.01.018
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发表时间：
2020-05-01
影响因子：
6.4
通讯作者：
Liang, Tongxiang
中科院分区：
文献类型：
--
作者：
Zeng, Longfei;You, Chaoping;Liang, Tongxiang
高/中熵合金（H/MEAs）代表了一种新的材料设计策略，其性能上级传统合金。在这里，我们展示了一个新的应用领域，其中H/MEA中的多个主要元素的均匀混合物被用来通过去合金化来创建新型纳米多孔合金。以等原子CrCoNi膜电极作为原型系统，采用液态金属去合金化方法制备了由等原子比单相固溶体组成的三维双连续开放纳米多孔CoCr合金.通过控制脱合金时间，可以调整韧带和孔隙的形貌和尺寸。纳米多孔CoCr合金在脱合金过程中的结构演变可以很好地描述为表面光滑化和韧带夹断介导的粗化过程。该研究为新型纳米多孔合金-纳米多孔高熵合金的开发开辟了一条新的途径，纳米多孔高熵合金由于其独特的纳米多孔结构和高熵效应的协同作用，有望获得前所未有的结构和功能特性。(C)2020年，任作家。由爱思唯尔公司出版
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. (C) 2020 The Authors. Published by Elsevier B.V.