|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Hall-Petch-like Relationship in Metallic Glasses
||Yucong Gu, Lin Li, Xiao Han, Feng Yan
|On-Site Speaker (Planned)
Metallic glasses (MGs) have high strength but minimal ductility. To improve ductility, it is suggested that tuning the nanoscale heterogeneity can be exploited to distribute localized flow. In this study, a mesoscale shear transformation zone dynamics model has been developed by incorporating elastic and plastic heterogeneities of deformation units in CuZr MGs. The spatial correlation of elastic heterogeneity leads to the formation of nanoscale soft spots that exhibit a great propensity to carry the plastic flow. The modeling results reveal a Hall-Petch-like relationship between the yield stress and spatial correlation length of heterogeneity. Furthermore, the slope of the Hall-Petch relationship scales with the standard deviation of the elastic heterogeneity. From modeling data, a multivariate nonlinear regression composite function is derived and used to explain the experimental results of MGs with various heterogeneities. The regression function can be further applied to guide the design of the nanoscale heterogeneity in amorphous nanostructures.
||Mechanical Properties, Modeling and Simulation, Computational Materials Science & Engineering