Superconducting Cu/Nb nanolaminate by coded accumulative roll bonding and its helium damage characteristics
Author(s)
Gao, Rui; Jin, Miaomiao; Han, Fei; Wang, Baoming; Wang, Xianping; Fang, Qianfeng; Dong, Yanhao; Sun, Cheng; Shao, Lin; Li, Mingda; Li, Ju; ... Show more Show less
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A very broad distribution of microstructural length scales spanning few nm- to the μm-scale has proven effective to achieve exceptional materials properties. Here, we fabricate a Cu/Nb two-phase composite made of a hierarchically layered structure by modifying the conventional accumulative roll bonding (ARB) technique, where fresh Nb sheets are inserted and bonded during a repeated stacking and rolling process. This barcode-like multilayer with a designed hierarchical length scale distribution possesses densely distributed phase boundaries and rich interfacial structures. The composite demonstrates similar superconductivity characteristics as pure Nb, but is 3 × stronger, has theoretically better oxidation resistance, and retains considerable ductility. Under the helium irradiation environment, the unique interfacial structures featuring chemical intermixing zones (3-dimensional) are more immune to the formation of large helium clusters than atomically sharp interfaces (2-dimensional), screening them from radiation damage and improving their long-term mechanical integrity. This work signifies an effective strategy of constructing hierarchical laminates to achieve high-performance materials, which holds promise in fusion and fission energy applications.
Date issued
2020-09Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Department of Materials Science and EngineeringJournal
Acta Materialia
Publisher
Elsevier BV
Citation
Gao, Rui et al. Superconducting Cu/Nb nanolaminate by coded accumulative roll bonding and its helium damage characteristics, Acta Materialia, Volume 197 (September 2020): 212-223.
Version: Author's final manuscript
ISSN
1359-6454