𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Atomistic simulations of hard and soft films under nanoindentation

✍ Scribed by Cheng-Liang Liu; Te-Hua Fang; Jen-Fin Lin

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
827 KB
Volume
452-453
Category
Article
ISSN
0921-5093

No coin nor oath required. For personal study only.

✦ Synopsis

Three-dimensional molecular dynamics (MD) simulation is used to investigate the atomistic mechanism of nanoindentation process under different indentation loads, temperatures and loading rates. Diamond and gold were selected as the hard and soft materials. The results showed that when the loads and the loading rates increased, both Young's modulus and the hardness of the films were increased. When the nanoindentation was operating under high temperatures, the thermal softness behavior took place causing a reduction in Young's modulus. The hardness for diamond and gold films was approximately 90-100 GPa and 3-5 GPa, while the present MD analysis for diamond and gold films was found to be 84-107 GPa and 5-7 GPa, respectively. Young's modulus for the diamond and gold films were approximately 1002-1100 GPa and 110-130 GPa, while the present MD analysis for diamond and gold films was found to be 1199-1862 GPa and 78-129 GPa, respectively. Both Young's modulus and the hardness were slightly higher than those in the experiments. The discrepancy between the MD analysis and the experiments will be further discussed in this paper.

πŸ“œ SIMILAR VOLUMES

Atomistic simulations of incipient plast
Atomistic simulations of incipient plasticity under Al(1 1 1) nanoindentation
✍ Youngmin Lee; Jong Youn Park; Sung Youb Kim; Sukky Jun; Seyoung Im πŸ“‚ Article πŸ“… 2005 πŸ› Elsevier Science 🌐 English βš– 773 KB

Atomistic simulations are performed for the study of defect nucleation and evolution in Al single crystal under nanoindentation. Methodologies employed include the molecular dynamics and molecular mechanics simulations with embedded-atom potentials. Simulated is the indenting process on Al(1 1 1) su

Estimation of Macromolecular Configurati
Estimation of Macromolecular Configurational Properties from Atomistic Simulations of Oligomers under Nonequilibrium Conditions
✍ Frederick E. Bernardin III; Gregory C. Rutledge πŸ“‚ Article πŸ“… 2008 πŸ› John Wiley and Sons 🌐 English βš– 202 KB

## Abstract Multi‐scale modeling requires the selection and preservation of information crucial to understanding the behavior of a system at appropriate length and time scales. For a full description of processed polymers, such a model must successfully link rheological properties with atomic‐level

Nanoindentation of single-crystalline go
Nanoindentation of single-crystalline gold thin films: Correlating hardness and the onset of plasticity
✍ Marianne Dietiker; Ralph D. Nyilas; Christian Solenthaler; Ralph Spolenak πŸ“‚ Article πŸ“… 2008 πŸ› Elsevier Science 🌐 English βš– 578 KB

Understanding the mechanical properties of materials with external dimensions on the nanometer scale is crucial for the design and fabrication of nanoelectronics and nanosystems. Metal thin films exhibit a size-dependent hardening effect that scales inversely with the film thickness down to 200 nm.

Local switching behavior and electrical
Local switching behavior and electrical polarization of ferroelectric thin films under nanoindentation
✍ V. Koval; J. Dusza; A.J. Bushby; M.J. Reece πŸ“‚ Article πŸ“… 2007 πŸ› Elsevier Science 🌐 English βš– 157 KB

The local polarization state and switching behavior of ferroelectric thin films under external mechanical loading were investigated. A nanoindentation technique has been devised to impose local mechanical stress. The results are presented for a 700 nm thick, Pb(Zr 0.30 Ti 0.70 )O 3 (PZT), film prepa