September 15, 2006
Hosted by: Jeffrey Kysar - CISE
Speaker: Frans Spaepen, Harvard University
The basics of glass science (structure, formation, thermodynamic stability, relaxation and atomic transport) as they apply to metallic alloys are reviewed. The essential phenomenololgy of mechanical behavior is presented: stiffness, homogeneous deformation (creep), inhomogeneous deformation (shear bands), and fracture (ductile and brittle). All of these phenomena can be understood based on ordering and disordering processes on the atomic scale. Experiments on colloidal glasses allow a direct look at the atomic scale mechanisms.
Frans Spaepen is the John C. and Helen F. Franklin Professor of Applied Physics at Harvard University Division of Engineering and Applied Sciences. 1971 received undergraduate degree in Metallurgical Engineering at the University of Leuven; and in 1975 received Ph.D. in Applied Physics from Harvard University. He joined the faculty of DEAS in 1977. From 1990 through 1998 he was Director of the Harvard Materials Research Laboratory/MRSEC. His research interests span a wide range of experimental and theoretical topics in materials science, such as amorphous metals and semiconductors (viscosity, diffusion, mechanical properties), the structure and thermodynamics of interfaces (crystal/melt, amorphous/crystalline semiconductors, grain boundaries), mechanical properties of thin films, and the perfection of silicon crystals for metrological applications. He is a Fellow of the American Physical Society (Chairman, Division of Materials Physics, 1992), a Fellow of TMS-AIME, a Foreign Member of the Vlaamse Academie voor Wetenschappen en Kunsten, and a member of ASM, and the Materials Research Society (Councillor: 1986-89; 1990-93; Chairman, Program Committee, 1993-2000). In 1988 he was Chairman of the Gordon Research Conference on Physical Metallurgy, and in 1990 he co-chaired the Fall Meeting of the MRS in Boston. He is co-editor of Solid State Physics, Principal editor of the Journal of Materials Research, and an editorial board member of a number of materials science journals.