Dimitri Chauraud

Max Planck Institute for Iron Research GmbH | MPIE · Department of Computational Materials Design

In Laves phases, synchroshear is the dominant basal slip mechanism. It is accomplished by the glide of synchro-Shockley dislocations. However, the atomic-scale mechanisms of motion of such zonal dislocations are still not well understood. In this work, using atomistic simulations, two 30{\deg} synchro-Shockley dislocations with different Burgers ve...

We report investigations on gold single crystals carried out with the help of an original experimental set-up, combining a scanning tunneling microscope and a compression device under ultra high vacuum, that allows for in situ observations of stressed surfaces at the atomic scale. It is observed that a macroscopic compression strain may induce a re...

The identification of defects in crystal structures is crucial for the analysis of atomistic simulations. Many methods to characterize defects that are based on the classification of local atomic arrangement are available for simple crystalline structures. However, there is currently no method to identify both, the crystal structures and internal d...

The identification of defects in crystal structures is crucial for the analysis of atomistic simulations. Many methods to characterize defects that are based on the classification of local atomic arrangement are available for simple crystalline structures like face-centered cubic or body-centered cubic crystals. However, there is currently no metho...

L’évolution de la reconstruction de surface de l’Au(111) sous contrainte-déformation a été étudiée dans le cadre d’une approche, à la fois expérimentale par microscopie à effet tunnel sous environnement ultra-vide couplée à un dispositif en compression, et numériquement par simulations en dynamique moléculaire. Dans un premier temps, nous avons étu...

We report investigations of gold single crystals carried out with the help of an original apparatus combining ultrahigh vacuum scanning tunneling microscopy and a compression device for in situ observations. It is demonstrated that the herringbone reconstruction on Au(111) is highly influenced by the appearance of slip traces that result from the e...

The effect of steps on the herringbone pattern appearing at the Au(111) surface is explored. Scanning tunnelingmicroscopy investigations show that the number of alternating fcc and hcp regions decreases with the decreasingwidth of the terrace, in fair agreement with atomistic simulations. It is demonstrated that the steps locally releasethe tensile...