Date(s) - 10/22/2020
5:00 pm - 6:30 pm
Hosted by UF American Nuclear Society Chapter
Dr. Dalong Zhang
Materials Scientist, Advanced Materials and Manufacturing
Pacific Northwest National Laboratory
From Advanced Characterization to Advanced Manufacturing – Seeing the Unseeable, Making the Impossible
Neutron irradiation at elevated temperatures leads to nano-sized features including dislocation loops and precipitates, which dictate mechanical behavior in metallic nuclear materials. Advanced characterization techniques, including scanning transmission electron microscopy (STEM) based dislocation imaging and chemical mapping, help to reveal these nano-sized features and how they behave upon deformation. “Homogeneous” dislocation cells versus localized dislocation channels are highlighted. Atom probe tomography (APT) is another shiny tool in the toolbox, “seeing” irradiation-induced nano precipitates/clusters, as well as “pre-clustering” of solute atoms in as-fabricated/as-welded materials even before irradiation. Finally, I will touch upon the exciting advanced manufacturing using PNNL’s own ShAPE machine, and the unprecedent properties we can achieve, and the impossible materials we can make, including my own forthcoming ARPA-E project.
Dalong Zhang, Ph.D., is a Materials Scientist in the Advanced Materials and Manufacturing Group at Pacific Northwest National Laboratory (PNNL). He obtained his Ph.D. in Materials Science at UC Davis in 2016, focusing on deformation mechanisms in Mg and Mg alloys. After postdoctoral training at Oak Ridge National Laboratory working on nuclear materials, particularly FeCrAl-based accident tolerant fuel cladding materials, he joined PNNL in 2019. His research interests spans across advanced manufacturing for Mg alloys and nuclear/fusion materials, advanced characterization, and radiation effects.
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