|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Influence of medium range ordering on the deformation behavior and mechanical properties of metallic glasses
||Yuchi Wang, Pengyang Zhao, Soohyun Im, Jinwoo Hwang, Yunzhi Wang
|On-Site Speaker (Planned)
Medium range ordering (MRO) is an important nanoscale structural heterogeneity in metallic glasses (MGs) that has been observed experimentally and shown direct correlation with the mechanical properties. Using a heterogeneously randomized STZ model with direct input on MRO structures from experiments, we explore the relationship between MRO and shear band formation in MGs. Based on experimental characterization using 4-D STEM, different types, sizes, and spatial distributions of MRO domains are considered in the simulations. MRO having different symmetries are assumed to have different shear modes, activation energy barriers, transformation strains, and softening behaviors from each other and from the glassy matrix. The simulation results indicate that the “strain frustration” mechanism helps to explain the correlation between the MRO structure and ductility, while “hard” or “soft” MROs show different responses during deformation. This experimentally informed parametric study provides the MRO-properties relationship of MGs, shedding light on future design of ductile MGs.
||Modeling and Simulation, Mechanical Properties, Other