Microalloyed medium-entropy alloy (MEA) composite nanolattices with ultrahigh toughness and cyclability
Volume 42, Issue , Page 10–16
| 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.
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DOI: 10.1016/j.mattod.2020.10.003
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