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Microalloyed medium-entropy alloy (MEA) composite nanolattices with ultrahigh toughness and cyclability
Materials Today ( IF 24.2 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.mattod.2020.10.003
Xiaobin Feng , James Utama Surjadi , Rong Fan , Xiaocui Li , Wenzhao Zhou , Shijun Zhao , Yang Lu

Abstract Three-dimensional nanolattices have recently emerged as an effective strategy to achieve high strength at low densities, by harnessing the combination of rationally designed topologies and nanoscale size effects [1] , [2] , [3] , [4] , [5] . However, most metallic and ceramic nanolattices show an ineludible deterioration of mechanical properties upon repeated loading due to localized brittle fracture. Here, by development and deposition of CoCrNiTi0.1 microalloyed medium-entropy alloy (MEA) with extra low stacking fault energy, we fabricated ultratough MEA-coated nanolattices that can exhibit unprecedented surface wrinkling under compression. Particularly, nanolattices with alloy film thickness ∼ 30 nm can repeatedly withstand strains exceeding 50% with negligible strut fracture, while the elastic polymer core promotes recoverability and structural integrity. Furthermore, owing to the high strength of the metallic film, our MEA composite nanolattices exhibited high energy absorption (up to 60 MJ m−3) and specific strength (up to 0.1 MPa kg−1 m3), offering a plethora of robust micro/nano-mechanical and functional applications.

中文翻译:

具有超高韧性和循环性的微合金化中熵合金(MEA)复合纳米晶格

摘要 通过利用合理设计的拓扑结构和纳米尺寸效应的结合,三维纳米晶格最近成为一种在低密度下实现高强度的有效策略 [1] , [2] , [3] , [4] , [5] ]。然而,由于局部脆性断裂,大多数金属和陶瓷纳米晶格在重复加载时表现出不可忽视的机械性能劣化。在这里,通过开发和沉积具有超低堆垛层错能的 CoCrNiTi0.1 微合金化中熵合金 (MEA),我们制造了超韧的 MEA 涂层纳米晶格,在压缩下可以表现出前所未有的表面起皱。特别是,合金膜厚度约为 30 nm 的纳米晶格可以反复承受超过 50% 的应变,而支柱断裂可忽略不计,而弹性聚合物核心促进可恢复性和结构完整性。此外,由于金属膜的高强度,我们的 MEA 复合纳米晶格表现出高能量吸收(高达 60 MJ m-3)和比强度(高达 0.1 MPa kg-1 m3),提供了大量坚固的微/纳米机械和功能应用。
更新日期:2020-11-01
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