MATERIALS
SEMINAR
Department of Materials
Science & Engineering
Friday, November 21, 2014
3:00 – 4:00 ~ DO 416
Please join us for refreshments at 2:30
Speaker
Dr. Anthony Rollett
Department of Materials Science and Engineering
Carnegie Mellon University, Pittsburgh, PA
approach. Synthetic microstructure generation with
tools such as Dream.3D now includes distributions of
orientation, grain boundary character and grain
morphology, even fitting the tails of distributions.
Examples are given of 3D studies of twin creation
during grain growth as it affects grain boundary
engineering (GBE), experiment-simulation comparisons
of mechanical twinning in Zr, orientation change and
gradients in tensile tests of copper, fatigue crack
initiation in superalloys, spatially varying strain and
orientation gradients in steel, and tin whisker formation.
Education
M.A. in Metallurgy & Materials Science, Cambridge
University, UK, 1976
Ph.D. in Materials Engineering, Drexel University, 1987
Professional Experience
Carnegie Mellon University:
Professor, Department of Materials Science &
Engineering, 1995-present
Professor & Department Head, 1995-2000
Los Alamos National Laboratory:
Deputy Division Director, Materials Science &
Technology Division, 1994-1995
Group Leader, Metallurgy Group, 1991-1995
Technical Staff Member, 1979-1991
Honors
Advances in Modeling and
Simulation of Microstructure, with
an Emphasis on 3D Aspects
There have been substantial advances in modeling and
simulation of microstructure in 3D. These have been
accompanied by equally significant advances in
characterization techniques, with serial sectioning,
synthetic microstructure generation and synchrotron
radiation all contributing strongly.
Image-based
methods for solving elastic, viscoplastic and elastoviscoplastic problems are now available to complement
finite element methods. The image-based methods
sidestep the difficulty of generating meshes that
conform to 3D microstructures while preserving mesh
quality. The FFT-based simulations originated by Pierre
Suquet and Ricardo Lebensohn provide an example.
The resolution available permits many aspects of
heterogeneity in deformation to be investigated.
Materials can also be orientation mapped nondestructively in 3D thanks to penetrating radiation at
synchrotrons, which permits microstructural evolution to
be characterized.
High Energy X-ray Diffraction
Microscopy (HEDM) is a prime example of this
Cyril Stanley Smith Award, TMS, 2014.
Fellow of TMS, 2011.
Fellow of the Institute of Physics (UK), 2005.
Howe Medal for Best Paper in Metallurgical
Transactions A, 2004.
Fellow of ASM-International, 1996.
Award for Technology Transfer from the Federal
Laboratories Consortium, 1989.
Current Research Interests:
Professor Rollett’s research program emphasizes
quantification of microstructure, especially in three
dimensions, and its impact on properties and processing using
both computational and experimental techniques. Important
recent results include the effect of second phase particles on
grain size stabilization in superalloys; investigation of
orientation gradients development in metals; development of
constitutive relations for sheet metal formability; measurement
of anisotropic grain boundary energies and mobilities;
development of methods for synthesizing statistically
representative three dimensional microstructures; measurement
and modeling of texture development during processing
(recrystallization) in aluminum alloys; effect of solute on
boundaries and triple junctions. The ultimate aim is to put
microstructure-properties relationships on a quantitative basis
for the prediction and optimization of materials processing and
application.
Contact – Dr. Kurt Sickafus – kurt@utk.edu