Separating Geometric and Diffusive Contributions to the Surface Nucleation of Dislocations in Nanoparticles.

ABSTRACT: While metal nanoparticles are widely used, their small size makes them mechanically unstable. Extensive prior research has demonstrated that nanoparticles with sizes in the range of 10-50 nm fail by the surface nucleation of dislocations, which is a thermally activated process. Two different contributions have been suggested to cause the weakening of smaller particles: first, geometric effects such as increased surface curvature reduce the barrier for dislocation nucleation; second, surface diffusion happens faster on smaller particles, thus accelerating the formation of surface kinks which nucleate dislocations. These two factors are difficult to disentangle. Here we use in situ compression testing inside a transmission electron microscope to measure the strength and deformation be

SUBMITTER: Ding R 

PROVIDER: S-EPMC10851666 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature