Jason Sebastian

From Northwestern University Center for Atom-Probe Tomography
Jump to navigation Jump to search
Jason Sebastian
(Dubrovnik, 2003)
Research: Materials Science
Education: BS, Ceramic Engineering, with highest honors (UIUC)
BA, Philosophy, summa cum laude (UIUC)
CPGS, Materials Science and Metallurgy (Cambridge University, UK)
PhD, Materials Science and Engineering (Northwestern University)
Publications: Publications by Sebastian in our database


Dr. Jason Sebastian
QuesTek Innovations, Evanston, IL
Phone: QuesTek Innovations, Evanston, IL
Fax: QuesTek Innovations, Evanston, IL
3DAP analysis of Au segregation at a CdO/Ag metal/ceramic heterophase interface.
A Particle Accelerator RF Cavity (copper).
Fine-scale dispersion of M2C strengthening carbides in a prototype steel developed by QuesTek for Navy landing gear applications. LEAP data collected by QuesTek at NUCAPT.
Atomic reconstruction of an MgO ceramic precipitate in a Cu metal matrix (the matrix atoms are omitted for the sake of clarity). From J. Ruesing, J. T. Sebastian, O. C. Hellman, and D. N. Seidman, "Three-Dimensional Investigations of Ceramic/Metal Heterophase Interfaces by Atom-Probe Microscopy," Microscopy and Microanalysis, 6 445-451 (2000). Data collected using the 3DAP and rendered using Apex.

I did my undergraduate work at the University of Illinois at Urbana-Champaign (B.S. and B.A) from 1991-1996, and a year of graduate study at the University of Cambridge, UK (Churchill College) from 1996-1997.

During my graduate school years at Northwestern (1997-2001), my Ph.D. research (under the supervision of Prof. Seidman) was supported by a National Defense Science and Engineering Graduate (NDSEG) Fellowship. My research focused on the nanoscale analysis of solute segregation at ceramic/metal interfaces (Ceramic/Metal Interfaces), and, more generally, on the study of early-stage phase separation and precipitation phenomena. Efforts were also directed towards the construction and commissioning of the Seidman Group three-dimensional atom-probe (3DAP, the predecessor to the lab's LEAP) and towards 3DAP data analysis (APEX).

After graduate school I worked in the Seidman Group as a Postdoctoral Fellow (2004-2005). I engaged in materials research related to improving the breakdown and dark current behavior of particle accelerator RF cavities. I oversaw upgrades to the lab's pulsed laser atom-probe (PLAP), and I was also involved in nanoscale materials research related to NUCAPT's newly-acquired (at the time) local-electrode atom-probe (LEAP). I was supervised jointly by Prof. Seidman and Dr. Jim Norem of Argonne National Lab.

From 2005-2006, I was a Staff Scientist in the Application Development and Engineering groups of Imago Scientific Instruments (Madison, WI; now a part of CAMECA, a Division of AMETEK, Inc.), where I worked on local electrode R&D, and on atom-probe application development (in particular, magnetic multilayer and semiconductor [Si-based] material applications).

I now (2006-present) work as the President at QuesTek Innovations (Evanston, IL), where I am a specialist in the fields of nanosturctural materials characterization and computational materials design. My work at QuesTek has focused on the development of high-strength steels for structural and gear applications, nickel superalloy development, high-strength/low-friction copper alloy development, advanced soft magnetic materials, advanced shape memory alloys, low-cost castable titanium alloys, and high-performance aluminum alloys. My work continues to be involved with advanced characterization techniques including LEAP atom-probe tomography and advanced serial-sectioning tomographic reconstruction analyses. I live in Chicago, IL with my wonderful wife Tania and my two kids (Sofia and Johnny).