Graduate Seminar Series
March 24, 2023
10:00 a.m. ET
Extrusion 3D-Printing: from Oxide Inks to Metallic Micro-lattices
To create metallic scaffolds or microlattices with sub-millimeter strut architectures, we develop a new method, Extrusion 3D-Printing, consisting of two simple steps. First, metal oxide particle suspensions (inks) are extruded, in air and at ambient temperature, into linear struts creating self-supporting lattices. Second, the oxides are hydrogen-reduced to metal and sintered into dense metallic microlattices.
We describe here micro-lattices made of pure metals – copper, iron, nickel or tungsten - created from inks consisting of the respective metal oxides. In all cases, thermochemical reduction and sintering of the 3D-printed oxide scaffolds results in large shrinkages (up to 80% by volume) but without cracking or distortion, as investigated via in-situ x-ray tomography.
We also demonstrate metallic alloys, using blends of oxides: Fe-20Ni-5Mo (a steel) and Co-Cr-Fe-Ni (a high-entropy alloy) and study, via in-situ x-ray diffraction, the interdiffusion resulting in homogenous alloys. Finally, we present more complex tungsten geometries, i.e., gyroids with triply periodic minimal surfaces.
David Dunand, Professor of Materials Science and Engineering, Northwestern University
David Dunand received his BS/MS degree at the Swiss Federal Institute of Technology (ETH, Zurich) in 1986 and his Ph.D. from the Massachusetts Institute of Technology (MIT) in 1991, both in materials science and engineering. After serving on the MIT faculty, he joined Northwestern University (NU) in 1997 where he is Professor in the Department of Materials Science and Engineering. His research focuses on the processing, microstructure and mechanical properties of metallic alloys, composites, and foams. Dunand is a fellow of TMS and ASM International, the recipient of the 2009 Distinguished Scientist/Engineering Award (Structural Materials Division of TMS), the 2012 winner of the Materials Science & Engineering A Journal Prize, and twice a departmental Teacher of the Year at NU. He is co-founder of NanoAl, LLC, a start-up aluminum company which was acquired in 2018 by Unity Aluminum, now part of Steel Dynamics, Inc.
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April 19 2024
10:00 AM ET
Materials Science and Engineering
Artificial Intelligence Driven Discovery Connects Scales, Disciplines, and Modalities, presented by Markus J. Buehler, Massachusetts Institute of Technology
Doherty Hall 2210
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April 25 2024
12:00 AM ET
Materials Science and Engineering
Anisotropic Attack of YA1O3 Model Environmental Barrier Coatings by Molten CaO-MgO- Al2O3-SiO2 Deposits, presented by Amanda Velazquez Plaza
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April 25 2024
10:30 AM ET
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Elucidation of the Effect of Chain Dispersity on Microstructure and Mechanical Properties of Brush Particle Assembled Materials, presented by Ayesha Abdullah
140 Roberts Hall
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April 26 2024
10:00 AM ET
Materials Science and Engineering
Presented by Noa Marom, Carnegie Mellon University
Doherty Hall 2210
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May 15 2024
2:00 PM - 3:00 PM ET
Bosch Spark Conference Room, Scott Hall