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- Title
Dimension-dependent mechanical features of Au-nanocrystalline nanofilms.
- Authors
Ma, Lijun; Du, Lena; Wang, Shu; Wang, Qing; Xue, Shifeng; Zhu, Hanxing; Liu, Qian
- Abstract
For metal nanofilms composed of nanocrystals, the multiple deformation mechanisms will coexist and bring unique and complex elastic-plastic and fracture mechanical properties. By successfully fabricating large quantities of uniform doubly-clamped suspended gold (Au) nanobeams with different thicknesses and nanograin sizes, we obtain full-spectrum mechanical features with statistical significance by combining atomic force microscopy (AFM) nanoindentation experiments, nonlinear theoretical model, and numerical simulations. The yield and breaking strengths of the Au nanobeams have a huge increase by nearly an order of magnitude compared with bulk Au and exhibit strong nonlinear effects, and the corresponding strong-yield ratio is up to 4, demonstrating extremely high strength reserve and vibration resistance. The strong-yield ratio gradually decreases with decreasing thickness, identifying a conversion of the failure type from ductile to brittle. Interestingly, the Hall–Petch relationship has been identified to be still valid at the nanoscale, and K in the equation reaches 4.8 Gpa·nm1/2, nearly twice of bulk nanocrystalline Au, which is ascribed to the coupling effect of nanocrystals and nanoscale thickness.
- Subjects
NANOFILMS; ATOMIC force microscopy; NANOINDENTATION; MECHANICAL alloying; NANOCRYSTALS; STATISTICAL significance; COMPUTER simulation
- Publication
Nano Research, 2023, Vol 16, Issue 12, p13400
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-023-6091-2