Disclination-dislocation based model for grain boundary stress field evolution due to slip transmission history and influence on subsequent dislocation transmission

Role of interfaces on the mechanical response of accumulative roll bondednanometallic laminates investigated via dislocation dynamics simulations

“…Further, the aforementioned body of work has yet to consider the potential effects out of equilibrium state of interfaces. In recent work by Bamney et al [74], it was found that the resistance to slip transmission in interfaces (symmetric tilt grain boundaries in this case) that are far from a minimum energy equilibrium state (e.g., interfaces that have been impacted by dislocations) can be significantly lower from that of minimum energy equilibrated interfaces. Therefore, for ARB-processed NMLs, it is unclear how plasticity will proceed and evolve as the interface state (i.e.…”

“…The underlying DDD-FDM method uses a node-based approach, where the nodal positions are updated based on the calculated nodal forces [58,74,76,77,80]. Herein, only the critical attributes of the newly developed transmission kinematics are discussed.…”

Dislocation pileups in small grains

“…Secondly, DPUs do exist and interact with GBs in many interesting ways (Shen et al, 1988;Clark et al, 1992;Zhang et al, 2021;Bamney et al, 2022;Zhou et al, 2019;Murr, 2016;Zhao et al, 2020;Li et al, 2021;Liu et al, 2022a;Liu et al, 2022b;Britton and Wilkinson, 2012;Guo et al, 2014;Soer et al, 2004;De Hosson et al, 2006;Kondo et al, 2016;Piao and Khanh, 2021;Ruggles et al, 2020;Huang et al, 2019;Li et al, 2022). TEM observations do not allow to determine the length of dislocation segments in a bulk grain, but as the dislocation forest can be expected to be the main contributor for dislocations piling up at the GB (Mecking and Kocks, 1981;Gil-Sevillano et al, 1991;Schouwenaars, 2012), relatively short segments can be expected.…”