|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Seeing is Believing -- Understanding Environmental Degradation and Mechanical Response Using Advanced Characterization Techniques: An SMD Symposium in Honor of Ian M. Robertson
||In-situ 4D-STEM Imaging of Mechanical Deformation in Medium Entropy Alloy (MEA) and Bulk Metallic Glass (BMG)
||Yang Yang, Sheng Yin, Qin Yu, Ruopeng Zhang, Mark Asta, Robert Ritchie, Andrew Minor
|On-Site Speaker (Planned)
Traditional in-situ TEM experiments record structural information in either real space or diffraction space, but not both, limiting a comprehensive understanding of the nanostructural evolutions. Recently, the combination of four-dimensional scanning transmission electron microscopy (4D-STEM) technique with high-speed electron detectors brought hope to overcome this challenge, enabling in-situ imaging of sub-nanometer resolved mapping of strain, short-range-orders (SROs), and other structural characteristics during mechanical deformation. Here we report the in-situ energy-filtered 4D-STEM studies of the mechanical deformation in CrCoNi medium entropy alloy (MEA) and CuZr bulk metallic glass (BMG). In this presentation, we will show the detailed interactions between the SROs, localized strain, and mechanical loading. The experimental observation is further verified by molecular dynamics (MD) simulations. Our findings demonstrated that the in-situ 4D-STEM technique can provide significant new insights into the deformation mechanisms in metals.
||Characterization, Mechanical Properties, High-Entropy Alloys