|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XV
||G-17: Correlation Between Structural Heterogeneity and Serrated Flow Behavior of Zr-based Metallic Glass
||LeHua Liu, ZhiYuan Liu, PeiJie Li
|On-Site Speaker (Planned)
Physical correlation between structural heterogeneity and plastic flow of metallic glasses (MGs) is crucial for the understanding of MGs’ deformation mechanism. In this work, different degrees of structural heterogeneity are introduced into Zr-based MGs through different cooling rates casting. The effect of structural heterogeneity on serrated flow behavior of the MG was studied. The findings demonstrate that serration flow dynamics of the MGs transforms from a chaotic state to a self-organized critical state with increased inhomogeneity. Furthermore, it is found that the serration event is generated by connecting randomly distributed internal localized loose structure namely flow units in shear layer, and its dynamics behavior is a process controlled by the flow units: higher degree of structural heterogeneity causes a wider distribution of activation energy of flow units, facilitates a larger trend of interaction and multiplication of shear bands by increasing nucleation sites, and then promotes serrated flow behavior to be more homogeneous in time and space, thereby induces transformation of dynamics behavior, thus brings a larger plastic deformation ability. The established correlation between structural heterogeneity and serrated flow behavior sheds light on deformation mechanism of plastic flow and provides a new insight into the plasticity of MGs.
||Planned: Supplemental Proceedings volume