Publication

Dislocations 2016

2016
Talks

Abstract

Dislocation dynamics are important to understand material plasticity in small-sized materials. In case of face-centered cubic crystalline systems, densities of initial dislocations, dislocation nucleations and starvations processes influence material strengths at micro- and nano-scales [1]. To model these multi-scale physics in concurrent manners, 2D Coupled Atomistic and Discrete Dislocation dynamics (CADD) [2] is the only available computational tool. However, in CADD, the described dislocation dynamics are limited to 2 dimensional systems. In this presentation, we propose a new method for coupling MD and DD simulations in 3D (CADD3D) to resolve the limitations of CADD. We introduce its required building blocks (core templates [3] and mobility law) and the coupling-communication scheme. The dynamics of a hybrid dislocation, which is a dislocation structure composed of atomic and discrete dislocations, will be shown to demonstrate the workability of the proposed communication scheme. Furthermore, several applications will be presented using CADD3D such as an expanding dislocation loop nucleated from a Frank-Read source.

Official source

https://infoscience.epfl.ch/entities/publication/c841b706-07ea-46f1-8246-c200bf28d649

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2016
Talks

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c841b706-07ea-46f1-8246-c200bf28d649

About this result

Related concepts (32)

Dislocation

In materials science, a dislocation or Taylor's dislocation is a linear crystallographic defect or irregularity within a crystal structure that contains an abrupt change in the arrangement of atoms. The movement of dislocations allow atoms to slide over each other at low stress levels and is known as glide or slip. The crystalline order is restored on either side of a glide dislocation but the atoms on one side have moved by one position. The crystalline order is not fully restored with a partial dislocation.

Cross slip

In materials science, cross slip is the process by which a screw dislocation moves from one slip plane to another due to local stresses. It allows non-planar movement of screw dislocations. Non-planar movement of edge dislocations is achieved through climb. Since the Burgers vector of a perfect screw dislocation is parallel to the dislocation line, it has an infinite number of possible slip planes (planes containing the dislocation line and the Burgers vector), unlike an edge or mixed dislocation, which has a unique slip plane.

Precipitation hardening

Precipitation hardening, also called age hardening or particle hardening, is a heat treatment technique used to increase the yield strength of malleable materials, including most structural alloys of aluminium, magnesium, nickel, titanium, and some steels, stainless steels, and duplex stainless steel. In superalloys, it is known to cause yield strength anomaly providing excellent high-temperature strength. Precipitation hardening relies on changes in solid solubility with temperature to produce fine particles of an impurity phase, which impede the movement of dislocations, or defects in a crystal's lattice.

Related publications (3)

Dislocations 2016

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Evaluation of the Work-Hardening Behavior of AISI 304L and AISI 904L Austenitic Stainless Steels by Miniature Testing Techniques

Longitudinal-neutron-polarization-analysis study of the spin dynamics in Sr14Cu24O41

H-aggregation and correlated absorption and emission of a merocyanine dye in solution, at the surface and in the solid state. A link between crystal structure and photophysical properties