This presentation will provide an overview of various alloy design activities at Northwestern University enabled by atom-probe tomography (APT), specifically the LEAP 5000XS instrument available at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). We combine microstructural and chemical information obtained on a sub-nanoscale by APT with results from other advanced characterization tools and theoretical methods (Ab initio and CALPHAD thermodynamic calculations and strength modeling) to design and study structure and properties of new alloys for conventional and additive manufacturing processes. Specific focus is given to high-temperature aluminum alloys and high-strength steels, showcasing our innovative design and characterization approaches.
Available on demand here.
About the presenter:
Amir R. Farkoosh
Post-Doctoral Researcher
Northwestern University
Materials Science and Engineering
Amir joined the Materials Science and Engineering department at Northwestern University in 2017, where he works as a research associate with Prof. David N. Seidman. His current research primarily focuses on designing advanced heat-resistance aluminum alloys and high-strength steels for additive manufacturing, using a combination of experimental and theoretical methods. Prior to joining Northwestern, he performed his doctoral research at McGill University in Quebec, Canada, where he studied the physics of creep resistance in high-temperature aluminum alloys.
Figure caption: A nano-scale Ti-rich oxide precipitate associated with a Ti(N,C) nano-carbide observed in an additively manufactured 17-4 stainless steel. The complex nanostructure is revealed by a sequence of cross-sections, displaying isoconcentration surfaces for Ti, N, O and C at different concentration levels, see legend. Dataset was acquired on a LEAP 5000XS in NUCAPT.