Statistical behaviour of interfaces subjected to curvature flow and torque effects applied to microstructural evolutions

Sebastian Florez (1) , Karen Alvarado (1) , Brayan Murgas (1) , Nathalie Bozzolo (1) , Dominique Chatain (2) , Carl E Krill (3) , Mingyan Wang (3) , Gregory S Rohrer (4) , Marc Bernacki (1)

1 CEMEF - Centre de Mise en Forme des Matériaux
2 CINaM - Centre Interdisciplinaire de Nanoscience de Marseille
3 Universität Ulm - Ulm University [Ulm, Allemagne]
4 CMU - Carnegie Mellon University [Pittsburgh]

The movement of grain boundaries in pure metals and alloys with a low concentration of dislocations has been historically proved to follow curvature flow behavior. This mechanism is typically known as grain growth (GG). However, recent 3D in-situ experimental results tend to question this global picture concerning the influence of the curvature on the kinetics of interface migration. This article explains, thanks to 2D anisotropic full-field simulations, how the torque effects can complicate these discussions. It is then illustrated that neglecting torque effects in full-field formulations can have a significant effect on the overall rate of GG, the shape of grains and grain boundaries as well as their local kinetics. The apparent reduced mobility can be much more complex than expected without necessarily questioning the influence of the curvature on the local kinetic equation.

Mots clés: Grain growth; anisotropy; torque effects; reduced mobility; curvature flow

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Sebastian Florez, Karen Alvarado, Brayan Murgas, Nathalie Bozzolo, Dominique Chatain, et al.. Statistical behaviour of interfaces subjected to curvature flow and torque effects applied to microstructural evolutions. Acta Materialia, 2022, 222, pp.117459. ⟨10.1016/j.actamat.2021.117459⟩. ⟨hal-03425706⟩