Exceptional fracture resistance of ultrathin metallic glass films due to an intrinsic size effect.

ABSTRACT: Metallic glasses typically fail in a brittle manner through shear band propagation but can exhibit significant ductility when the sample size is reduced below a few hundreds of nanometers. To date the size effect was mainly demonstrated for free-standing samples and the role of extrinsic setup parameters on the observed behavior is still under debate. Therefore, in the present work we investigated the mechanical properties of polymer-supported sputtered amorphous Pd₈₂Si₁₈ thin films with various thicknesses. We show that the films exhibit brittle fracture for thicknesses far below 100 nm. A pronounced size effect resulting in extended crack-free deformation up to 6% strain was observed only in films as thin as 7 nm - a thickness which is lower than the typical shear b

SUBMITTER: Glushko O 

PROVIDER: S-EPMC6547732 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature