Atomic-scale insight into non-crystallographic slip traces in body-centred cubic crystals

Benjamin Douat (1) , Christophe Coupeau (1, 2) , Joel Bonneville (1, 3) , Michel Drouet (1) , Loranne Vernisse (1, 2) , Ladislas P. Kubin (4)

1 PPrime [Poitiers] - Institut Pprime [UPR 3346]
2 SIMAC - Surface, Interfaces et MAtériaux sous Contrainte [Institut Pprime]
3 PDP - Physique des Défauts et de la Plasticité [Institut Pprime]
4 LEM, UMR 104 CNRS-ONERA, Université Paris Saclay (COmUE) [Châtillon]

At low and moderate temperatures, dislocation motion propagates plastic flow in crystals through the shearing of dense crystallographic planes by an elementary translation. Almost one century ago, it was discovered that body-centred cubic metals behave differently and slip may occur in 'non-crystallographic' planes. Till now slip trace examinations were performed using current imaging and diffraction techniques. A homemade deformation device coupled to a scanning tunneling microscope made it possible to examine (as here shown in niobium crystals) slip traces with atomic resolution. The traces consist of several atomic step combinations, of which the related crystallographic planes were identified.

Mots clés: bcc crystals; Scanning tunneling microscopy; Pencil glide; Niobium crystals; Slip traces

Domaines: Mécanique des fluides [physics.class-ph]; Matériaux et structures en mécanique [physics.class-ph]; Vibrations [physics.class-ph]; Physique mathématique [math-ph]; Physique Quantique [quant-ph]; Acoustique [physics.class-ph]; Biomécanique [physics.med-ph]; Matériaux; Polymères; Acoustique [physics.class-ph]; Automatique / Robotique; Electromagnétisme; Milieux fluides et réactifs; Energie électrique; Thermique [physics.class-ph]

Benjamin Douat, Christophe Coupeau, Joel Bonneville, Michel Drouet, Loranne Vernisse, et al.. Atomic-scale insight into non-crystallographic slip traces in body-centred cubic crystals. Scripta Materialia, 2019, 162, pp.292-295. ⟨10.1016/j.scriptamat.2018.10.032⟩. ⟨hal-02282805⟩