Andrew Minor1,2
University of California, Berkeley1,Lawrence Berkeley National Laboratory2
Andrew Minor1,2
University of California, Berkeley1,Lawrence Berkeley National Laboratory2
This talk will describe our recent results utilizing energy filtered diffraction, 4D-STEM and in situ TEM nanomechanical testing that provide insight into multiscale deformation phenomena in the CrCoNi medium entropy alloy. Using energy-filtered TEM and HRSTEM techniques it is possible to directly image, and therefore quantitatively assess, SRO and its effect on mechanical properties. In order to understand the effect of SRO in terms of the evolution of plasticity at different stages, the technique of 4D-STEM was used during in situ deformation and fracture experiments. 4D-STEM can provide both real-space imaging and diffraction analysis during <i>in situ</i> testing, making it possible to perform strain mapping via diffraction pattern analysis during in-situ deformation in a TEM. The diffraction patterns are used to identify defects and map relative strain, while the images formed by using virtual apertures provide microstructural context for the analysis.