期刊
NANO LETTERS
卷 22, 期 5, 页码 1897-1904出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c04144
关键词
nanomaterials; strength; dislocations; toughness; interfaces; composite
类别
资金
- DOE BES Office of Science, Basic Energy Sciences [DE-SC0020133]
- DOE NNSA SSGF [DENA0003960]
- NSF through the MRSEC program
- National Science Foundation [CNS-1725797]
- California NanoSystems Institute
- Materials Research Science and Engineering Center (MRSEC) at UC Santa Barbara [NSF DMR 1720256]
- U.S. Department of Energy (DOE) Office of Science [89233218CNA000001, DE-NA-0003525]
- U.S. Department of Energy (DOE) [DE-SC0020133] Funding Source: U.S. Department of Energy (DOE)
By broadening heterophase interfaces into 3D interfaces, the strength-ductility trade-off of two-phase nanolaminates can be overcome. The 3D interfaces prevent flow instability and shear localization by interacting with dislocation pileups.
Two-phase nanolaminates are known for their high strength, yet they suffer from loss of ductility. Here, we show that broadening heterophase interfaces into 3D interfaces as thick as the individual layers breaks this strength-ductility trade-off. In this work, we use micropillar compression and transmission electron microscopy to examine the processes underlying this breakthrough mechanical performance. The analysis shows that the 3D interfaces stifle flow instability via shear band formation through their interaction with dislocation pileups. To explain this observation, we use phase field dislocation dynamics (PFDD) simulations to study the interaction between a pileup and a 3D interface. Results show that when dislocation pileups fall below a characteristic size relative to the 3D interface thickness, transmission across interfaces becomes significantly frustrated. Our work demonstrates that 3D interfaces attenuate pileup-induced stress concentrations, preventing shear localization and offering an alternative way to enhanced mechanical performance.
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