Upcoming Interdisciplinary Materials Seminars

Friday, October 10, 2008, from 12PM to 1PM in HEC 104:
Prof. Lei Zhai, Nanoscience and Technology Center, UCF
Title: Dispersing Carbon Nanotubes Using Conjugated Block Copolymers

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Friday, October 31, 2008, from 12PM to 1PM in HEC 104:
Prof. Ryan S. Elliott, Dept. of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis
Title:   Atomistic Molding of Martensitic Transformation in Shape Memory Alloys: Theoretical and
Computational Techniques

Abstract:

Some of the most interesting and technologically important solid-solid transformations are the first-order diffusionless (martensitic) transformations that occur in certain ordered multi-atomic crystals. These include the reconstructive martensitic transformations, where no group-subgroup symmetry relationship exists between the phases, found in steel and ionic compounds such as CsCl. Additionally, there are the reversible proper martensitic transformations, where group-subgroup relationships exist, that occur in shape memory alloys (SMAs) such as NiTi. SMAs are especially interesting, for engineering applications, due to their strong thermomechanical (multi-physics) coupling. The mechanism responsible for these stress-induced transformations is a change in stability of the crystal’s lattice structure as the applied load is varied.

The aim of this research is to understand the mechanisms that lead to the existence of these transformations. This is achieved by studying how simple atomic force models and exact crystalline geometry can give rise to truly complex properties of the bulk material. In this work, a continuum-level thermoelastic energy density for a perfect bi-atomic multilattice crystal is derived from an atomistic Effective Interaction Potential (EIP) model. Cauchy-Born kinematics is used to ensure, by the introduction of internal atomic shifts, that each atom is in equilibrium with its neighbors. In order to identify any stress-induced martensitic transformations predicted by the EIP model the equilibrium equations are solved as a function of an applied load. Thus, a numerical branch-following technique is used to determine the quasi-static stress-strain behavior of the crystalline material. In addition, an asymptotic bifurcation analysis is used to identify paths that emerge from all bifurcation points (simple and ”multiple”) that are encountered. The stability of each equilibrium configuration against all possible bounded perturbations is determined by calculating the phonon spectra of the crystal.

One critical advantage of this approach is that the stability criterion includes perturbations of all wavelengths instead of only the long wavelength information that is available from the stability investigation of homogenized continuum models. This allows one to capture the important “translation symmetry breaking” martensitic transformations often found in SMAs. The above described theory and methods will be reviewed and results will be presented that clearly demonstrate the EIP model’s ability to simulate stress-induced transformations such as those found in common SMAs.

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Friday, November 7, 2008, from 12PM to 1PM in HEC 104:
Prof. James Hickman, Nanoscience and Technology Center, UCF
Title:   Integration of Cells and Proteins with Silicon Devices via Surface Microengineering for the Creation
of Functional In Vitro Systems

Past Interdisciplinary Materials Seminars (Fall 2008)

Monday, Sept. 15, 2pm in room ENG 288 (joint seminar with MMAE)

Professor Henning Zoz, 
Zoz Group, D-57482 Wenden, Germany, CIITEC-IPN, Instituto Politecnico Nacional, Mexico City, C.P. 02250 México, D.F.
Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
Title:   Nanostructured Materials by HKP (high kinetic processing) in Commercial Manufacturing (proper
conditions + innovation = success)

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Wednesday, September 10, 11AM in CREOL room 102
(joint seminar with NSTC)
Dr. Qi Zhang, Penn State University, State College, PA
Title:   Analytical electron microscopy techniques for probing nanostructures

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Past Interdisciplinary Materials Seminars
(from Summer 2007 to Spring 2008)

Friday, April 11
Prof. Alp Sehirlioglu, NASA Glenn Research Center and Case Western Reserve University
Title:  Next Generation Materials for Piezoelectric Actuators

Friday, March 28
Drs. Nori Okano, William McClellan, and Linda Sikel,
Olympus Industrial
Title:  Microscopy for Today’s Applications: 3D Visible and IR Confocal Imaging and Metrology - Standard
Image Forming Techniques

Tuesday, March 18
Dana S. Meyer, Dr. Kemal O. Pasamehmetoglu,
Idaho National Laboratory
Title:  U.S. Domestic Reactor Conversion Program and Transmutation Fuel Development for Global
Nuclear Energy Partnership

Friday, March 7 (joint with NSTC, FSEC)
Dr. Ana Arias, Palo Alto Research Center
Title:  Solution Processed Materials for Flexible Large Area Electronics

Friday, February 15
Officer Jeannette Emert, UCF Police Department
Title:  Raising awareness of problems with theft and personal safety

Friday, February 8 (joint with NSTC, Chemistry)
Prof. Francesco Stellacci, Massachusetts Institute of Technology
Title:  Supramolecular Nano-Materials and Lithography

Tuesday, November 27
(joint with School of Electrical Engineering and Computer Science)
Dr. Leonidas Ocola, Argonne National Laboratory
Title:  Nanofabrication at the Center for Nanoscale Materials

Friday, November 9
(joint with School of Electrical Engineering and Computer Science)
Prof. Donald Gardner, Intel
Integrated On-Chip Inductors Using Magnetic Materials

Friday, September 28 (joint with NSTC)
Prof. John Texter, Eastern Michigan University, Ypsilanti
Title:  Advanced Porous Materials From Ionic Liquid-Based Copolymers

Friday, September 28
Prof. Paul Holloway, University of Florida
Title:  Synthesis, Luminescence, and Applications of Nanophosphors

Friday, September 28 (joint with NSTC)
Prof. Ramki Kalyanaraman, Washington University
Title:  Self-organization from fast laser-induced dewetting of ultrathin metal films