Modeling plasticity of MgO by 2.5D dislocation dynamics simulations

• DOI: 10.1016/j.msea.2017.02.092
• Publication Date: 2017-02-25T03:15:16Z
• Authors: Riccardo Reali; Francesca Boioli; Karine Gouriet; Philippe Carrez; Benoit Devincre; Patrick Cordier
• Keywords: Climb; Atmospheric temperature range; Tension (geology)

In this study, we model the plasticity of MgO (periclase) using a 2.5-dimensional (2.5D) dislocation dynamics (DD) simulation approach. This allows us to incorporate climb in DD simulations creep behavior at high-temperature. Since 2D formulation cannot capture some important features activity (e.g. those involving line tension), local rules are introduced take these into account (this is 2.5D approach). To ensure validity such approach, applied over wide temperature range with view lower regimes where newly mechanism (climb) not active, benchmark our against previous 3D and experimental data. Thus consider successfully low (T≤600 K) regime dominated by glide thermally activated regime; an intermediate (T=1000 dislocation-dislocation interactions; high-temperature (1500≤T≤1800 which actual goal present study governed controlled recovery (climb being considered here). We show that, taking oxygen self-diffusion coefficients available literature, able describe properly MgO.