|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||STZ-vortex Unit – The Key to Understand and Control Shear Banding in Metallic Glasses
||Daniel Sopu, Xudong Yuan, Jürgen Eckert
|On-Site Speaker (Planned)
The ability to control plastic deformation of MGs is based on the capacity to influence the activation and percolation of shear transformation zones (STZs) that ultimately leads to shear band formation. Here, by calculating the atomic strain and simultaneously occurring directional rotation fields, a novel and more complete perspective of STZ activation is proposed, highlighting its Eshelby-like inclusion characteristics. The novel STZ-vortex mechanism provides an atomistic description of deformation mechanisms like shear band formation and propagation, shear band branching and multiplication or shear band blocking and deflection. Additionally, STZ-vortex mechanism has of primary importance for understanding the brittle-to-ductile transition from cracking to localized shear banding and homogeneous deformation. Through the proper control of the STZ-vortex sequence, one could handle the shear band dynamics and avoid runaway instability, thereby improving the plastic deformability of metallic glasses at room temperature.
||Modeling and Simulation, Mechanical Properties, Computational Materials Science & Engineering