Highlights
Apr 30, 2009
Crack Interaction With Grain Boundaries in Zinc Bicrystals
D. Catoor, K.S. Kumar, A.F. Bower, Y. Wei and W.M. Curtin
Grain boundaries are inherent defects in most materials of technological
relevance. Understanding how a growing crack interacts with them will enable design of microstructures to enhance the material toughness, a
Apr 30, 2009
Kinetic model of whisker growth in Sn films
E. Buchovecky, A.F. Bower, E. Chason, S. Kumar Division of Engineering, Brown University
The spontaneous growth of whiskers from Pb-free Sn solder films on Cu
substrates poses a serious threat to the reliability of electronic circuits.
Researchers at Brown are using experiments and computer simulations
to understand the mechanisms for the formation of Sn whiskers. As part
Apr 30, 2009
BrownOut: Engineering Educational Outreach
J. Blume, Division of Engineering
Classroom Visits Program
J. Blume, Division of Engineering
Brown undergraduates and faculty visit local science/math classes or youth programs to present engineering topics to students in Grades K-12. Presentations are developed by students and faculty based on current research or topics covered in the Brown
curriculum.
Student groups, such as the National Society of Black Engineers Student Chapter, Engineers without Borders, and th FSAE Care Team participate.
Example Presentations
Apr 29, 2009
Mechanics of crack deflection at a twist grain boundary
Yujie Wei, Allan F. Bower, Huajian Gao
Heterogeneous brittle solids such as ceramics, lamellar intermetallics, and olycrystalline hexagonal-close-packed (hcp) metals such as Zr, Zn and Cd are echnologically important and broadly used. Zirconium, for example, has a low bsorption cross section for neutrons, and is therefore used in nuclear energy pplications. Titanium aluminide (TiAl) is a candidate material for many
Apr 23, 2009
Johns Hopkins University
Multiple States of Nanoring Magnetic Tunnel Junctions
Background: The geometry of a nanoring magnet provides unique magnetic configurations of onion, vortex, and twisted, which can be exploited in nanoring magnetic tunnel junctions (NRMTJs) .
Apr 20, 2009
University of Chicago
Granular materials in a Hele-Shaw Cell
Xiang Cheng (University of Chicago) Lei Xu (Harvard University) Aaron Patterson (Morehouse College) Heinrich Jaeger (University of Chicago) Sidney Nagel (University of Chicago)
A Hele-Shaw system was used by University of Chicago MRSEC researchers, Sidney Nagel and Heinrich Jaeger and their research groups, to explore the zero-surface-tension properties of granular "fluids."Â’ Theoretically, it was determined by Paul Wiegmann, also at the University of Chicago, that fluid fingering in the zero-surface-tension limit should lead to singular cusp structure locally and fractal geometry globally.Â’ Granular flow provides the first experime
Apr 20, 2009
University of Chicago
Charge transport in arrays of multicomponent nanostructures
Jong-Soo Lee (University of Chicago) Elena V. Shevchenko (Argonne National Laboratory) Dmitri V. Talapin (University of Chicago)
Researchers, Dmitri Talapin and collaborators, at the University of Chicago MRSEC have been studying electronic properties of new nanoscale materials consisting of both magnetic and semiconducting components (FePt and PbS).Â’ These components are integrated into individual nanostructures forming multicomponent quantum-confined objects.Â’ The core-shell morphology maximizes the interaction between the components and provides a convenient platform for studying
Apr 1, 2009
University of Nebraska - Lincoln
Stripes are Stars! Pt Helps Fe to Stay Magnetized
A. Enders, R. Skomski (Nebraska MRSEC), J. Honolka, K. Kern, K. Fauth, G. Schuetz (MPI Stuttgart, Germany), P. Varga (TU Vienna, Austria) and H. Ebert (LMU Munchen, Germany)
The magnetic anisotropy energy is among the most important functional properties of magnetic elements. It determines the orientation and stability of the magnetization as well as the mechanisms and the dynamics of the magnetization reversal.
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