Abstract
Disordered materials, like metallic glasses or silicate glasses, have an atomistic amorphous structure preventing the formation of extended defects such as dislocations. Irreversible deformation in these materials is thus localized, but can organize along shear bands. In this brief review, based on recent publications, we will see if local plasticity can be measured and predicted in disordered atomic assemblies, and in what conditions it can be related to preexisting structural defects. We will then draw a general picture of the plastic mechanical behaviour within the theoretical framework of mechanical instabilities. Finally, we will focus our attention on different scenarii for shear banding in glasses.
Highlights
Amorphous materials are disordered at all scales, meaning that they do not exhibit any characteristic structural lengthscale despite the average interatomic distance
Disordered materials, like metallic glasses or silicate glasses, have an atomistic amorphous structure preventing the formation of extended defects such as dislocations
Irreversible deformation in these materials is localized, but can organize along shear bands. In this brief review, based on recent publications, we will see if local plasticity can be measured and predicted in disordered atomic assemblies, and in what conditions it can be related to preexisting structural defects
Summary
Amorphous materials are disordered at all scales, meaning that they do not exhibit any characteristic structural lengthscale despite the average interatomic distance. The signature of plasticity is not always visible neither in the structure factor, due to the fact that, in amorphous materials, the related structural changes if any are far from being homogeneously distributed, and because plasticity in amorphous samples does not always induce recognizable structural changes [6] In this context, numerical simulations at the atomic scale [7,8,9,10,11,12,13,14] combined. Despite the general belief that amorphous materials like glasses are brittle, they all develop plasticity, either at small or large scale, depending on the temperature, and on the applied load (pressure, strain rate). It was measured already in the sixties that silica glasses exhibit plasticity without volume conservation [22]. We will conclude by discussing the possibilities to measure the amount of plastic deformation in an amorphous material knowing only its initial and final configurations, as well as to predict the shape and position of plastic rearrangements before they occur
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