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MICDE Seminar: Irene Beyerlein, Professor, Mechanical Engineering, University of California, Santa Barbara
November 15, 2019 @ 3:00 pm - 4:00 pm
Bio: Irene J. Beyerlein is a Professor at the University of California at Santa Barbara (UCSB) with a joint appointment in the Mechanical Engineering and Materials Departments. She currently holds the Robert Mehrabian Interdisciplinary Endowed Chair in the College of Engineering. After receiving her Ph.D. degree in Theoretical and Applied Mechanics at Cornell University in 1997, she began a postdoctoral appointment as a J.R. Oppenheimer Fellow at Los Alamos National Laboratory, where she remained on the scientific staff in the Theoretical Division, until 2016, when she joined UCSB. She has published one book, nine book chapters, and more than 300 peer-reviewed articles in the field of structural composites, materials processing, multiscale modeling of microstructure/property relationships, deformation mechanisms, and polycrystalline plasticity. She is an Editor for Acta Materialia and Scripta Materialia and an Associate Editor for Modelling and Simulation in Materials Science and Engineering. In recent years, she has been awarded the Los Alamos National Laboratory Fellow’s Prize for Research (2012), the International Plasticity Young Researcher Award (2013), the TMS Distinguished Scientist/Engineering Award (2018), and the Brimacombe Metal (2019).
A COMPOSITE OF SUPERIOR PROPERTIES WITH NANOSTRUCTURED COMPOSITE MATERIAL
Many future engineering systems will rely on high-performance metallic materials that are several times stronger and tougher than those in use today. In many situations, these superior properties will be desired in harsh environments, such as elevated temperatures, at high rates, and under irradiation. Nanolaminates, built from stacks of crystalline layers, each with nanoscale individual thicknesses, are proving to exhibit a composite of many of these target properties. Examples span from nanotwinned materials to biphase nanolaminates, comprised of alternating nano-thick layers that differ in orientation, chemistry and crystal structure. Studies on these materials report exceptional properties far beyond a volume average value of their constituents, such as strengths that are over five to ten times higher, hardness values that are several orders of magnitude higher, and unprecedented microstructural stability in harsh environments, such as irradiation, sudden impact, or elevated temperatures. While the combination of properties is clearly attractive, one roadblock to applying the nanolaminate concept to any general composite material system is their complex, highly anisotropic deformation behavior, making them less reliable than coarsely structured materials. Critical to designing the material nanostructure to achieve uniformity and reliability is understanding and predicting the strength properties of nanostructure materials based on known conditions and measurable variables, such as basic nanostructure size scales and chemical composition. Multiscale models for conventional coarse-grained materials have been in development for several decades, but analogous versions for nanostructured materials require extensions to explicitly account for the overriding dominance of internal boundaries on these microstructure/property relationships. The computational materials challenge lies in how to represent the discrete and statistical dislocation glide processes in nanostructured materials so that the profound influence of the fine nanoscale crystals can be properly replicated in simulation. In this talk, we will present recent examples of computational techniques and some unanticipated couplings between nanostructural size effects and microstructural evolution and strength that arise from their application.
Prof. Beyerlein is being hosted by Prof. Fan (ME).