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MSE Seminar - Dr. Martin Glicksman, Florida Institute of Technology
Monday, February 29, 2016 - 4:00pm
Title: "Thermodynamics of Autogenous Pattern Formation"
Centimeter-length needle crystals melt self-similarly in microgravity, but then exhibit the on-set of rapid shape change as melting reduced their size below about 5mm. The ellipsoidal crystallites’ large axial ratios (typically 10-15) fell by an order-of-magnitude when they spheroidized. The cause of that surprising shape change, and its radical departure from self-similar melting, was investigated using the Reynolds transport theorem. Leibniz-Reynolds analysis shows that where capillary energy is released, normal interface speed accelerates during melting and slows during growth. Conversely, where capillary energy is removed from an interface, its speed slows during melting and accelerates during growth. Irrespective of whether a crystal melts or grows, autogenous speed modulations are found to reverse direction where the capillary energy release itself changes sign. When these countervailing perturbations occur on morphologically unstable interfaces, inflection and ‘curling’ result, which promote the onset of branching and pattern complexity. Dynamic simulations of interface patterns using phase field and other numerical methods confirm quantitatively that inflection/branching initiates precisely at the locations of ‘Laplace points’ predicted analytically from the Reynolds theorem and field theory.
Martin E. Glicksman is currently Dean of Engineering at Florida Institute of Technology. Prior to joining Florida Tech, (2006-2011) Glicksman was a Florida 21st Century Scholar and Professor of Materials Science and Engineering at the University of Florida. He served for 31 years at Rensselaer Polytechnic Institute as Department Head, Materials Science & Engineering, and as John Tod Horton Professor of Materials and Chemical Engineering. Glicksman received his B. Met. E. (1957) and Ph.D. (1961) from Rensselaer, and was selected for a National Academy of Sciences Postdoctoral Associateship (1961-63), during which he studied electronic transport in liquid metals, and the growth of alloy single crystals. In 1963 he joined the Metallurgy Division, Naval Research Laboratory (NRL), Washington, DC, where from 1967-1975 he established and ran NRL’s Transformations and Kinetics Branch. His research concentrated on kinetic studies of solid–liquid and solid state transformations, and the processing and properties of A15 superconductors. Glicksman is known for research contributions in the fields of solidification kinetics, crystal growth, interface science, and microstructure evolution (over 300 papers). He pioneered techniques using in situ methods to observe and measure dendritic growth, phase coarsening, grain growth, and other important diffusion-limited microstructure changes. His recent textbooks, Diffusion in Solid, Field Theory and Applications, (J.Wiley, 2000) and Principles of Solidification (Springer 2011) were successfully introduced into undergraduate materials engineering courses and into graduate courses on atomic diffusion and crystal growth.
Dr. Glicksman held visiting professorships at universities in the US, Germany, Spain, Greece and Israel. He is a Fellow of the Metallurgical Society (TMS), the American Society for Materials (ASM), and the American Association for the Advancement of Science (AAAS), and the American Institute for Aeronautics and Astronautics (AIAA). For research accomplishments in the field of solidification of metals Glicksman received the S.P. Rockwell medal, the Kent van Horn Award, and ASM’s Marcus Grossman Award. His successful execution of the Isothermal Dendritic Growth Experiment in 1994, 1996, and 1997 aboard space shuttle Columbia led to his NASA Award for Technical Excellence and to the National Space Processing Award and Medal from the AIAA. In 1996 he was elected as a member of the National Academy of Engineering. In 2002 and 2003 Glicksman was in residence at the Institute for Metal Physics, RWTH-Aachen, Germany, as an Alexander von Humboldt senior research scholar. In 2003 he received ASM’s International Gold Medal for his career-long contributions to materials research and teaching. From 1987-2005 Glicksman served as Director of Microgravity Science and Applications for the Universities Space Research Association (USRA), and currently is a technical advisor for the Center for Advancement of Science in Space (CASIS) and participates on panels and boards for the US government, including the Space Studies Board and the National Materials Advisory Board of the National Research Council (NRC). and advises several colleges and universities.