期刊
ADVANCED MATERIALS
卷 32, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201906458
关键词
diamond; mechanical deformation; molecular dynamics; nanopillars; nanotechnology
类别
资金
- Australian Research Council [DP180100077, DP190101058, LP170100150]
- Asian Office of Aerospace Research and Development Grant [FA2386-17-1-4064]
- Office of Naval Research Global [N62909-18-1-2025]
- Australian Government Research Training Program Scholarship
- Australian Government
- Government of Western Australia
Diamond is known to possess a range of extraordinary properties that include exceptional mechanical stability. In this work, it is demonstrated that nanoscale diamond pillars can undergo not only elastic deformation (and brittle fracture), but also a new form of plastic deformation that depends critically on the nanopillar dimensions and crystallographic orientation of the diamond. The plastic deformation can be explained by the emergence of an ordered allotrope of carbon that is termed O8-carbon. The new phase is predicted by simulations of the deformation dynamics, which show how the sp(3) bonds of (001)-oriented diamond restructure into O8-carbon in localized regions of deforming diamond nanopillars. The results demonstrate unprecedented mechanical behavior of diamond, and provide important insights into deformation dynamics of nanostructured materials.
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