The mechanical performance and structural integrity of structural materials is often intimately linked to the internal microstructure. Small angle scattering of both neutrons and high-energy x-rays provides a valuable probe of structural variations on length scales ranging from 0.5-200nm in these materials in bulk samples and allows for in-situ measurements. In this seminar I will provide a cursory introduction to the application of small-angle scattering to the study of these materials with examples of different types of analysis possible, briefly discussing thermal aging effects in high temperature superalloys used in power-generation turbines, precipitate-strengthened industrial steels, precipitate ordering in welds in precipitate strengthened alloys, and in-situ diagenesis and metamorphism in sedimentary rocks.
EDUCATION
1990 – 1997 Ph.D. (Physics: Neutron Interferometry), University of Missouri-Columbia (USA).
1989 –1990 M.S. (Physics), University of Maryland Baltimore County (USA).
1985 – 1989 B.A. cum laude (Physics and Mathematics, dual major),
University of Maryland Baltimore County (USA).
Member ... (physics), ... (math), and ... national honor societies
PROFESSIONAL EXPERIENCE
2006–Present Staff Scientist, HFIR CG2 General-Purpose SANS Lead Instrument Scientist, Neutron
Scattering Sciences Division, Oak Ridge National Laboratory, USA.
2000–2006 Neutronics and Instrument Scientist, Intense Pulsed Neutron Source, Argonne National Laboratory, USA.
1997–2000 Postdoctoral Research Fellow in Small Angle Neutron Scattering, Intense Pulsed Neutron Source, Argonne National Laboratory, USA.
EXPERTISE AND INTERESTS
The development of beamline optics and design improvements for neutron scattering instrumentation including the development of focusing and magnetic optics with a non-exclusive emphasis on small-angle neutron scattering (SANS) and ultrasmall angle neutron scattering (USANS) techniques. The application of SANS to study the structure and assembly of macromolecules in solution, structure and dynamics of catalytic systems, structure of multicomponent or composite and complex-fluid systems.
MEMBERSHIPS AND PROFESSIONAL ACTIVITIES
Member and 2009 SAS SIG Chair ACA, Member of and facility representative to CANSAS, Member TOF-USANS instrument development team steering committee for SNS, USA and SANS design working groups for D33 at ILL, France, SANS2d, ZOOM, and Larmor instruments at ISIS 2nd target station, UK, and Quokka, ANSTO replacement reactor, Australia, and the SANS
instruments at JAEA. Collaborating Scientist with image and information division at RIKEN for work on neutron optics and detectors 2002–2006. Instructor for SANS experimental section of the Argonne X-ray/Neutron scattering school 2001–2005 and ANL/ORNL Joint X-ray/Neutron scattering school 2008–2009. Organizing committee member of IConUSAS 2003, PNCMI 2004, ACA session chair and organizer 2005, 2007, 2008, and 2009 (2 sessions). Proposal reviewer for NIST and IPNS. Reviewer for JAC, NIMA, Physica B, JCIS, JCP, and Energy & Fuels journals and for U.S. Government Department of Energy SBIR funding proposals.
