Current Research Interests
Origins of the mechanical properties of bulk and nanoscale metals:
Dislocation structure evolution (statistical physics theory), stresses in dislocation structures (X-ray microbeam experiments, theory, modeling), slip band evolution (in situ atomic force microscopy), nanoindentation multiscale modeling (finite element and classical atomistic), nanowire deformation (classical atomistic and quantum simulations).
Synchrotron X-ray scattering and diffraction:
Ultra-small-angle X-ray scattering (USAXS) from dislocation structures (experiment and theory), co-developer of USAXS imaging which is available for general users at the Advanced Photon Source, spatially resolved stress measurements using depth resolved sub-micrometer X-ray beams
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Position:
Physicist
Metallurgy
Materials Performance
Employment History:
Professional Background
1997 - present: Staff Position, Materials Science and Engineering Laboratory, NIST
- Project Leader, Fundamentals of Deformation (1997-present)
- Program Leader, Forming of Lightweight Materials (2001 - 2007)
- Project Leader, Ballistic Performance of Frangible Bullets and Protective Gear (2004 - 2007)
1995 - 1997: Research Associate at Washington State University, working as NIST Guest Scientist
- Fundamentals of deformation
- USAXS from dislocation structures
1993 - 1995: Visiting Assistant Professor of Physics at Washington University in St. Louis
- Quasicrystals (transmission electron microscopy)
1991 - 1993: Postdoctoral Position, IBM T. J. Watson Research Center
- Developed in situ ultra-high vacuum, scanning tunneling microscopy of electromigration processes
Organizing Activities
- Founded the Dislocations Conference Series (2000), permanent member of international organizing committee.
- Plasticity Conference Symposia (2003, 2005)
- MRS Symposia (2001, 2003, 2004, 2006)
- TMS Symposia (2007)
- APS Focus Sessions (1997, 1998
- Workshops and Short Courses (2 in 1998, 2 in 2006)
NIST Outputs
- Invited talks: 77
- Books edited: 3
- Review chapters: 2
- Road maps: 2
Major Awards
NIST Allen V. Astin Measurement Science Award (2004) - For advancements in the measurement of dynamic material properties, leading to the first ever stress-strain measurements at high strain-rate and heating-rate
Education:
Ph.D. Washington University in St. Louis 1990 Physics
M.A. Washington University in St. Louis 1987 Physics
B.S. California Institute of Technology 1983 Physics
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