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Materials Science and Engineering Seminar

Dr. Amy Clarke

John Henry Moore Endowed Chair of Metallurgy
George S. Ansell Department of Metallurgical and Materials Engineering, Colorado School of Mines

Abstract

Large temperature gradients, high solidification velocities, and repeated cycles of heating and cooling are typically experienced during additive manufacturing (AM). Combinations of thermal gradient and solid/liquid interface velocity are known to impact microstructure development, including potential grain refinement produced by the columnar to equiaxed transition. Thus, a deeper understanding of solidification (and solid state phase transformations, when appropriate) under AM conditions is needed to guide alloy design matched to AM processes. State-of-the-art, multiscale characterization of solidification dynamics and resulting microstructures in the context of the local conditions experienced during AM is needed to achieve this aim. New insights into microstructure development under AM conditions obtained by in-situ/ex-situ characterization of conventional alloys, model alloys, and alloys designed for AM are highlighted. Multiscale in-situ/ex-situ characterization is compared to process modeling and solidification theory and modeling, which will enable the prediction and control of metallic alloy solidification dynamics by advanced manufacturing.

Bio

Amy J. Clarke is a Professor and John Henry Moore Endowed Chair of Metallurgy, Co-Director of the Center for Advanced Non-Ferrous Structural Alloys, and a faculty member with the Advanced Steel Processing and Products Research Center in the George S. Ansell Department of Metallurgical and Materials Engineering at the Colorado School of Mines (Mines). She holds joint appointments with Pacific Northwest National Laboratory in the Nuclear Sciences Division and Los Alamos National Laboratory (LANL) in the Materials Science and Technology Division and is a Guest Scientist in Sigma Division at LANL. She received her MS and PhD degrees from Mines and her BS degree at Michigan Technological University in Metallurgical and Materials Engineering. Her research focuses on physical metallurgy and making, measuring, and modeling metallic alloys during processing to realize advanced manufacturing. Amy serves on The Minerals, Metals & Materials Society (TMS) Foundation Board of Trustees, has served on the TMS and Association for Iron & Steel Technology Boards of Directors, and is an Editor for Metallurgical and Materials Transactions A. She is a recipient of the Presidential Early Career Award for Scientists and Engineers (nominated by the U.S. Department of Energy and the National Nuclear Security Administration’s Defense Programs), an Office of Naval Research Young Investigator Program, and U.S. Department of Energy Office of Science Early Career Research Program, is a TMS Brimacombe Medalist, and a Fellow of ASM International.