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Winter 2008 Seminar Series
Friday, February 8, at 3:30 p.m.
Room 264 MacQuigg Labs
John J. Lewandowski
Leonard Case, Jr., Professor of Engineering
Director Center for Mechanical Characterization of Materials
Department of Materials Science and Engineering
Case Western Reserve University
Flow and Fracture Behavior of Bulk Metallic Glasses
Abstract
Bulk metallic glasses and their composites possess an interesting combination of properties under quasi-static, cyclic, and dynamic test conditions. A brief introduction to the evolution of this class of materials will be presented, followed by an overview of the mechanical behavior of metallic glasses and their composites. In addition to covering aspects related to the strength and pressure sensitivity of this class of materials, the effects of changes in alloy composition and mixed mode loading on the damage tolerance (i.e. toughness) will be described. Included in the presentation will be very recent experiments conducted to determine the effects of changes in test temperature and loading rate on some of these properties. Testing at strain rates in excess of 10,000/sec has also been conducted, while high speed video has been used to record the deformation and fracture events operating under these extreme conditions.
Bio
John J. Lewandowski received his B.S., M.E., and Ph.D. in Metallurgical Engineering and Materials Science at Carnegie Mellon University where he was a Hertz Foundation Fellow. He subsequently spent two years as a NATO Postdoctoral Fellow in the Department of Materials Science and Metallurgy at Cambridge University, England, working with Prof. John F. Knott, FRS, on fracture and fatigue of engineering materials. Upon returning to the U.S., he joined the faculty of the Department of Materials Science and Engineering at Case Western Reserve University as an Assistant Professor. He is currently the Leonard Case Jr. Professor of Materials Science and Engineering, and Director of the Mechanical Characterization Facility. He has received a number of national and international awards for his teaching and research efforts.
In the area of research, he has received the Allegheny International Research Fellowship at CMU, the HERTZ Foundation Graduate Fellowship at CMU, the NATO/NSF Postdoctoral Fellowship for Research at University of Cambridge, an ALCAN Research Fellowship for Research at University of Cambridge, the NSF Presidential Young Investigator Award, the ASM Research Silver Medal, the Charles Hatchett Award from the Institute of Metals (U.K.) for work on Nb, and was elected an Overseas Fellow at Churchill College, Cambridge University, where he spent a sabbatical year for 2003-04.
In the area of teaching and mentoring, he has received the CTSC Technical Educator Award, the SAE Ralph R. Teetor Educational Award, the ASM Bradley Stoughton Award for Young Teachers, and the John S. Diekhoff Award for Graduate Teaching and Mentoring at CWRU. He has served on a number of panels organized by the National Research Council/National Academy of Sciences as well as the Institute of Mechanics and Materials at the University of California at San Diego. He was elected Fellow of ASM in 1995 and is past Chair of the ASM/TMS Joint Composites Committee. His publications and presentations number in excess of 225 and 500, respectively, and are primarily in the areas of processing/structure/property relationships in ferrous and non-ferrous engineering materials; the effects of superposed pressure on deformation and fracture; fatigue and fracture of intermetallics and composites, bulk metallic glass, and layered/laminated materials; deformation processing; blast-resistant materials; and engineered materials systems.
Please join our speaker for light refreshments in 479 Watts Hall following the talk.
