Anomalous entropy-driven kinetics of dislocation nucleation.

ABSTRACT: The kinetics of dislocation reactions, such as dislocation multiplication, controls the plastic deformation in crystals beyond their elastic limit, therefore critical mechanisms in a number of applications in materials science. We present a series of large-scale molecular dynamics simulations that shows that one such type of reactions, the nucleation of dislocation at free surfaces, exhibit unconventional kinetics, including unexpectedly large nucleation rates under compression, very strong entropic stabilization under tension, as well as strong non-Arrhenius behavior. These unusual kinetics are quantitatively rationalized using a variational transition state theory approach coupled with an efficient numerical scheme for the estimation of vibrational entropy changes. These results highligh

SUBMITTER: Bagchi S 

PROVIDER: S-EPMC11751456 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature