The Stress-Dependent Activation Parameters for Dislocation Nucleation in Molybdenum Nanoparticles.

ABSTRACT: Many specimens at the nanoscale are pristine of dislocations, line defects which are the main carriers of plasticity. As a result, they exhibit extremely high strengths which are dislocation-nucleation controlled. Since nucleation is a thermally activated process, it is essential to quantify the stress-dependent activation parameters for dislocation nucleation in order to study the strength of specimens at the nanoscale and its distribution. In this work, we calculate the strength of Mo nanoparticles in molecular dynamics simulations and we propose a method to extract the activation free-energy barrier for dislocation nucleation from the distribution of the results. We show that by deforming the nanoparticles at a constant strain rate, their strength distribution can be approximated by a n

SUBMITTER: Chachamovitz D 

PROVIDER: S-EPMC5834640 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature