Dislocations in amorphous materials
نویسندگان
چکیده
2014 The general aim of this paper is to provide a better understanding of amorphous materials, with special reference to glassy and granular systems, indicating areas where the behaviour of these two may be similar. We lay special emphasis on granular systems, as befits their importance as a newly emerging field of study in physics, and present a review of recent progress in understanding their statics and dynamics. The underlying connection between the latter in the form of transmission of stress leading to flow, is discussed, and speculations are made as to the possible mechanism of this transmission. J. Phys. France 50 (1989) 2489-2503 15 SEPTEMBRE 1989, Classification Physics Abstracts 05.20 05.40 05.60 05.90
منابع مشابه
Amorphous intergranular films as toughening structural features
The ability of amorphous intergranular films to mitigate damage formation at grain boundaries is studied with molecular dynamics simulations. We find that such films can alter both crack nucleation and crack growth rates by efficiently absorbing dislocations, with thicker films being more effective sinks. Local plastic strain brought by incoming dislocations is diffused into a triangular region...
متن کاملA Note on the Kinematics of Dislocations in Crystals
A part of the theory of dislocations in crystals is revised with the aim to fit it into the framework of the nonlinear theory of plasticity initially designed for amorphous glassy materials. Dislocations provide a microscopic mechanism explaining the plasticity of crystals. The idea of dislocations suggested by Taylor and Orowan in 1934 is illustrated on the first two figures. Fig. 1.1 and Fig....
متن کاملElectrical wind force-driven and dislocation-templated amorphization in phase-change nanowires.
Phase-change materials undergo rapid and reversible crystalline-to-amorphous structural transformation and are being used for nonvolatile memory devices. However, the transformation mechanism remains poorly understood. We have studied the effect of electrical pulses on the crystalline-to-amorphous phase change in a single-crystalline Ge(2)Sb(2)Te(5) (GST) nanowire memory device by in situ trans...
متن کاملDuctile crystalline-amorphous nanolaminates.
It is known that the room-temperature plastic deformation of bulk metallic glasses is compromised by strain softening and shear localization, resulting in near-zero tensile ductility. The incorporation of metallic glasses into engineering materials, therefore, is often accompanied by complete brittleness or an apparent loss of useful tensile ductility. Here we report the observation of an excep...
متن کاملMicromechanical modelling of nanocrystalline and ultrafine grained metals: A short overview
An overview of micromechanical models of strength and deformation behaviour of nanostructured and ultrafine grained metallic materials is presented. Composite models of nanomaterials, polycrystal plasticity based models, grain boundary sliding, the effect of nonequilibrium grain boundaries and nanoscale properties are discussed and compared. The examples of incorporation of peculiar nanocrystal...
متن کامل