Download Atomistic and Continuum Modeling of Nanocrystalline by Mohammed Cherkaoui;Laurent Capolungo PDF

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By Mohammed Cherkaoui;Laurent Capolungo

Atomistic and Continuum Modeling of Nanocrystalline Materials develops a whole and rigorous cutting-edge research of the modeling of the mechanical habit of nanocrystalline (NC) fabrics. between different key subject matters the cloth makes a speciality of the unconventional recommendations used to foretell the habit of nanocrystalline fabrics. specific cognizance is given to fresh theoretical and computational frameworks combining atomistic and continuum methods. additionally, the main correct deformation mechanisms governing the reaction of nanocrystalline fabrics are addressed and mentioned in correlation with on hand experimental facts.

Drawing upon years of useful and educational event and utilizing quite a few examples, authors Mohammed Cherkaoui and Laurent Capolungo hide a large spectrum of fabric, together with:

New modeling suggestions and their power purposes and attainable extensions, reminiscent of molecular dynamics, pressure gradient dependent finite aspect simulations, and novel micromechanical schemes

Novel types describing plastic deformation techniques happening in nanocrystalline fabrics together with grain boundary dislocation emission

How to build and use a molecular dynamics code for functional use within the modeling of NC fabrics

Atomistic and Continuum Modeling of Nanocrystalline fabrics is vital e-book for researchers in addition to graduate scholars who're both coming into those fields for the 1st time, or these already carrying out learn during this sector and aspiring to expand their wisdom of nanocrystalline materials.

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Extra resources for Atomistic and Continuum Modeling of Nanocrystalline Materials: Deformation Mechanisms and Scale Transition

Example text

Hence, substantial microstructural changes are to be expected from such large strains. Microstructure Grain refinement during HPT occurs in a similar fashion as in ECAP. From an experimental standpoint, TEM observations exhibit SAD (selected area diffraction) patterns evolving, with increasing number of turns, from a nonuniform elongated spot-like figure to a more uniform and clearly defined SAD pattern. Hence, the evolution in microstructure can be described as follows. 1 One-Step Processes 9 subgrains joined by low-angle grain boundaries are formed.

The same conclusion was reached on samples fabricated by several different processes. Let us note that the lattice strain is typically more pronounced in the vicinity of grain boundaries and triple junctions. 1 Dislocations Dislocation density measurements have been subject to controversial debate with reported values of dislocation density varying from 1015 mÀ2 to zero. 2 presents high-resolution transmission electron microscopy (HRTEM)image of electrodeposited Ni with average grain size of $30 nm prior to deformation [5].

34 2 Applications of Nanocrystalline Materials Fig. 4 Evolution of the stacking fault parameter with strain for UFG PD (in bold) and nanocrystalline IGC Pd Although this will be described in detail in Chapter 5, let us briefly discuss here the modeling of grain boundaries in coarse-grained polycrystalline materials. Grain boundaries can be regarded as particular groups of geometrically necessary dislocations. Indeed, dislocations can generally be put into two categories: (1) statistically stored dislocations, and (2) geometrically necessary dislocations.

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