|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Effect of Surface and Internal Defects on the Mechanical Properties of Metallic Glasses
||Sunghwan Kim, Seunghwa Ryu
|On-Site Speaker (Planned)
Despite the significance of surface effects on the deformation behaviors of small-scale metallic glasses, systematic investigations on surface states are lacking. In this work, by employing atomistic simulations, we characterize the distributions of local inhomogeneity near surfaces created by casting and cutting, along with internal distributions in pristine and irradiated bulk specimens, and investigate the effects of inhomogeneity on the mechanical properties. The cast surface shows enhanced yield strength and degrees of shear localization in contrast to the cut. Correspondingly, plastic deformation is initiated near the cut surface, but far from the cast surface. We reveal that improved local symmetry promotes strengthening in cast surfaces due to faster diffusion near the surface. However, a significant correlation among local symmetries, and the degree of shear localization is found for the pristine and irradiated bulk materials. Our findings reveal the sensitivity of the surface state to the surface preparation methods.
||Planned: Supplemental Proceedings volume