Plastic Deformation of Single‐Crystal Diamond Nanopillars
Abstract
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 sp3 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 28, 2020
- Source ID
- 10.1002/adma.201906458
Entities
People
- Alireza Aghajamali
- Blake Regan
- Igor Aharonovich
- Irene Suarez‐martinez
- James Bishop
- Johannes Froech
- John D. Scott
- Julie Cairney
- Milos Toth
- Nigel A. Marks
- Toan Trong Tran
- Ying Liu
Organizations
- Australian Research Council
- Curtin University
- Office of Naval Research Global
- University of Sydney
- University of Technology Sydney