Computational Study on Mechanical Properties of Atomic-Cluster-Assembled Structure (1st Report, Lattice Defects Generated between Atomic Clusters)

2004 ◽  
Vol 70 (690) ◽  
pp. 183-190
Author(s):  
Ken-ichi SAITOH ◽  
Noboru SHINKE
Keyword(s):  
Mechanical Properties ◽  
Computational Study ◽  
Atomic Clusters ◽  
Lattice Defects ◽  
Atomic Cluster

scholarly journals Is Superplasticity in the Future of Nanophase Materials?

1990 ◽  
Vol 196 ◽  
Author(s):  
R. W. Siegel
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Room Temperature ◽  
Grain Boundary Sliding ◽  
Atomic Clusters ◽  
Diffusional Creep ◽  
Ultrafine Grain ◽  
Grain Sizes ◽  
Nanophase Materials ◽  
Boundary Sliding

ABSTRACTThe ultrafine grain sizes and high diffusivities in nanophase materials assembled from atomic clusters suggest that these materials may have a strong tendency toward superplastic mechanical behavior. Both small grain size and enhanced diffusivity can be expected to lead to increased diffusional creep rates as well as to a significantly greater propensity for grain boundary sliding. Recent mechanical properties measurements at room temperature on nanophase Cu, Pd, and TiO2, however, give no indications of superplasticity. Nonetheless, significant ductility has been clearly demonstrated in these studies of both nanophase ceramics and metals. The synthesis of cluster-assembled nanophase materials is described and the salient features of what is known of their structure and mechanical properties is reviewed. Finally, the answer to the question posed in the title is addressed.

Global Optimization of Atomic Cluster Structures Using Parallel Genetic Algorithms

2005 ◽  
Vol 894 ◽  
Author(s):  
Ofelia Oña ◽  
Victor E. Bazterra ◽  
María C. Caputo ◽  
Marta B. Ferraro ◽  
Julio Facelli
Keyword(s):  
Global Optimization ◽  
Density Functional ◽  
Atomic Clusters ◽  
Medium Size ◽  
Atomic Cluster ◽  
Approximate Methods ◽  
Functional Theory ◽  
Parallel Genetic Algorithms ◽  
Applied Technology ◽  
Optimization Schemes

AbstractThe study of the structure and physical properties of atomic clusters is an extremely active area of research due to their importance, both in fundamental science and in applied technology. For medium size atomic clusters most of the structures reported today have been obtained by local optimizations of plausible structures using DFT (Density Functional Theory) methods and/or by global optimizations in which much more approximate methods are used to calculate the cluster’s energetics. Our previous work shows that these approaches can not be reliably used to study atomic cluster structures and that approaches based on global optimization schemes are needed. In this paper, we report the implementation and application of a parallel Genetic Algorithm (GA) to predict the structure of medium size atomic clusters.

DSC and TEM analysis of lattice defects governing the mechanical properties of an ECAP-processed magnesium alloy

2007 ◽  
Vol 42 (5) ◽  
pp. 1477-1482 ◽  
Author(s):  
B. Mingler ◽  
O. B. Kulyasova ◽  
R. K. Islamgaliev ◽  
G. Korb ◽  
H. P. Karnthaler ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Lattice Defects ◽  
Tem Analysis

scholarly journals Mechanical anisotropy of two-dimensional metamaterials: a computational study

2019 ◽  
Vol 1 (8) ◽  
pp. 2891-2900 ◽  
Author(s):  
Ning Liu ◽  
Mathew Becton ◽  
Liuyang Zhang ◽  
Keke Tang ◽  
Xianqiao Wang
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Computational Study ◽  
2D Materials ◽  
Mechanical Anisotropy ◽  
Coarse Grained ◽  
Two Dimensional ◽  
Geometrical Factors ◽  
Dynamics Simulations

Mechanical properties, especially negative Poisson's, of 2D sinusoidal lattice metamaterials based on 2D materials depends highly on both geometrical factors and tuned mechanical anisotropy according to our generic coarse-grained molecular dynamics simulations.

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