|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XV
||Influence of Nanoscale Structural Heterogeneity on Shear Banding in Metallic Glasses
||Pengyang Zhao, Ju Li, Jinwoo Hwang, Yunzhi Wang
|On-Site Speaker (Planned)
The correlation between structural heterogeneity at nanoscale (e.g., medium-range order, MRO) with plastic deformation in metallic glasses (MGs) is investigated in this study. We first propose a correlation between the properties of shear transformation zone (STZ) and the local structural information at the MRO length scale. As revealed by experiments, the MRO exhibits different types of atomic order and symmetry in MGs depending on the processing and service history. We then carry out STZ dynamics simulations to document effects of volume fraction and symmetry of dissimilar STZs (derived from experimental characterization of the MRO) on shear banding dynamics and stress-strain behavior. In particular, a “precipitate-hardening” effect is observed and “strain frustration” is introduced to explain and better understand the influence of nanoscale structural heterogeneity on mechanical behavior of MGs. This work provides a fundamental understanding of the relationship between the mechanical properties of MGs and their MRO-level structural heterogeneities.
||Planned: Supplemental Proceedings volume