Journal ArticleDOI
Length-scale effects in the nucleation of extended dislocations in nanocrystalline Al by molecular-dynamics simulation
TLDR
In this paper, the authors studied the nucleation of extended dislocations from the grain boundaries in nanocrystalline aluminum by molecular-dynamics simulation and found that the length of the stacking fault connecting the two Shockley partials that formed the extended dislocation depends not only on the stacking-fault energy but also on the resolved nucleation stress.About:
This article is published in Acta Materialia.The article was published on 2001-08-16. It has received 369 citations till now. The article focuses on the topics: Grain boundary strengthening & Grain boundary.read more
Citations
More filters
Journal ArticleDOI
Mechanical properties of nanocrystalline materials
TL;DR: The mechanical properties of nanocrystalline materials are reviewed in this paper, with emphasis on their constitutive response and on the fundamental physical mechanisms, including the deviation from the Hall-Petch slope and possible negative slope, the effect of porosity, the difference between tensile and compressive strength, the limited ductility, the tendency for shear localization, fatigue and creep responses.
Journal ArticleDOI
Mechanical behavior of nanocrystalline metals and alloys
TL;DR: In this article, the authors present an overview of the mechanical properties of nanocrystalline metals and alloys with the objective of assessing recent advances in the experimental and computational studies of deformation, damage evolution, fracture and fatigue, and highlighting opportunities for further research.
Journal ArticleDOI
Deformation twinning in nanocrystalline materials
TL;DR: In this paper, a review of deformation twinning in nanocrystalline materials is presented, including deformation twins observed by molecular dynamics simulations and experiments, twinning mechanisms, factors affecting the twinning, analytical models on the nucleation and growth of deformations, interactions between twins and dislocations, and the effects of twins on mechanical and other properties.
Journal ArticleDOI
Dislocation processes in the deformation of nanocrystalline aluminium by molecular-dynamics simulation.
TL;DR: It is demonstrated that, in contrast to coarse-grained Al, mechanical twinning may play an important role in the deformation behaviour of nanocrystalline Al, and large-scale molecular-dynamics simulations are used to elucidate this intricate interplay during room-temperature plastic deformation of model nanocrystaline Al microstructures.
Journal ArticleDOI
Grain boundary-mediated plasticity in nanocrystalline nickel.
Zhi-Wei Shan,Eric A. Stach,Jörg M.K. Wiezorek,James Arthur Knapp,David M. Follstaedt,Scott X. Mao +5 more
TL;DR: Observations of nanocrystalline nickel films with an average grain size of about 10 nanometers show that grain boundary–mediated processes have become a prominent deformation mode, and trapped lattice dislocations are observed in individual grains following deformation.
References
More filters
Book
Computer Simulation of Liquids
Michael P. Allen,D. J. Tildesley +1 more
TL;DR: In this paper, the gear predictor -corrector is used to calculate forces and torques in a non-equilibrium molecular dynamics simulation using Monte Carlo methods. But it is not suitable for the gear prediction problem.
Book
Theory of Dislocations
John Price Hirth,Jens Lothe +1 more
TL;DR: Dislocations in Isotropic Continua: Effects of Crystal Structure on Dislocations and Dislocation-Point-Defect Interactions at Finite temperatures.
Journal ArticleDOI
Crystal structure and pair potentials: A molecular-dynamics study
TL;DR: In this paper, it was shown that different pair potentials lead to different crystal structures, with the use of a Lagrangian which allows for the variation of the shape and size of the periodically repeating molecular-dynamics cell.
Journal ArticleDOI
Nanostructured materials: basic concepts and microstructure☆
TL;DR: In this article, the authors summarize the basic physical concepts and the microstructural features of equilibrium and non-equilibrium nanostructured materials (NsM) and make an attempt to summarize their properties.