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Displaying 1 - 25 of 46

Cavitation Creep in the Next Generation Silicon Nitride

October 12, 2021
Author(s)
F Lofaj, Sheldon M. Wiederhorn, Gabrielle G. Long, P R. Jemian, M Ferber
X-ray scattering (A-USAXS). Failure strains were around 0.5 %. The creep resistance of this grade was found to be up to two orders of magnitude better than that of other silicon nitrides. The corresponding stress exponents were higher than 6. Creep damage

High-efficiency Coherence-Preserving Harmonic Rejection with Crystal Optics

September 1, 2018
Author(s)
Fan Zhang, Andrew J. Allen, Lyle E. Levine, Gabrielle G. Long, Ivan Kuzmenko, Jan Ilavsky
We report a harmonic rejection scheme based on the combination of Si (111) monochromator and Si (220) harmonic-rejection crystal optics. This approach is of importance to a wide range of X- ray applications in all three major branches of modern X-ray

New Synchrotron X-Ray Techniques for In-Situ Deformation Studies

February 19, 2017
Author(s)
Lyle E. Levine, R Thomson, Gabrielle G. Long, David R. Black
Many types of defects contribute to local and long-range stresses and strains in materials. These include vacancies, voids, prismatic loops, interstitials, inclusions, and dislocations. In most cases, dislocations play the dominant role in minimizing long

Versatile USAXS (Bonse-Hart) Facility for Advanced Materials Research

February 19, 2017
Author(s)
J Ilavsky, P Jemain, Andrew J. Allen, Gabrielle G. Long
The USAXS facility at UNICAT Sector 33 at the Advanced Photon Source (APS) is a world-class resource for advanced materials research emphasizing full-range charactrization of nanometer-scale to micrometer-scale microstructures. Receiving photons from an

An Ordered Metallic-Glass Solid-Solution Phase That Grows From the Melt Like a Crystal

January 1, 2014
Author(s)
Lyle E. Levine, Karena Chapman, Leonid A. Bendersky, Gabrielle G. Long, John W. Cahn, Peter Chupas, Judith K. Stalick, Frederic Mompiou
We used high-energy synchrotron-based X-ray scattering to investigate the structure of an isotropic AlFeSi metallic glass that nucleates and grows from the melt during rapid cooling like a crystal. The glass is a noncrystalline homogeneous metastable phase

A highly ordered non-crystalline metallic phase

July 5, 2013
Author(s)
Gabrielle G. Long, Karena Chapman, Peter Chupas, Leonid A. Bendersky, Lyle E. Levine, Frederic Mompiou, John W. Cahn, Judith K. Stalick
We report the characterization of an ordered non-crystalline isotropic metallic solid that, during rapid cooling of an Al-Fe-Si melt, forms by nucleation, followed by growth along a moving interface between the solid and melt with partitioning of the

Structure and Dynamics Studies of Concentrated Micrometer-Sized Colloidal Suspensions

January 7, 2013
Author(s)
Fan Zhang, Andrew J. Allen, Lyle E. Levine, Jan Ilavsky, Gabrielle G. Long
We present an experimental study of the structural and dynamical properties of concentrated suspensions of a series of different sized polystyrene microspheres dispersed in glycerol for volume fraction concentrations between 10 % and 20 %. The static

High-energy Ultra-Small Angle X-ray Scattering Instrument at the Advanced Photon Source

December 1, 2012
Author(s)
Andrew J. Allen, Lyle E. Levine, Fan Zhang, Gabrielle G. Long, Jan Ilavsky, Pete R. Jemian
This paper reports recent tests performed on the Bonse-Hart-type ultra-small angle X-ray scattering (USAXS) instrument at the Advanced Photon Source with higher-order reflection optics — Si (440) instead of Si (220) — and with X-ray energies greater than

Complementary Experimental Techniques for Multi-Scale Modeling of Plasticity

October 16, 2008
Author(s)
Lyle E. Levine, Gabrielle G. Long, David R. Black
Some recently-developed experimental techniques, such as in situ ultra-small-angle X-ray scattering (USAXS), have demonstrated a capability for measuring aspects of dislocation structure evolution that are inaccessible to other experimental methods

X-Ray Imaging with Ultra-Small-Angle X-Ray Scattering as a Contrast Mechanism

October 1, 2004
Author(s)
Lyle E. Levine, Gabrielle G. Long
A new transmission X-ray imaging technique based upon ultra-small-angle X-ray scattering (USAXS) is described. Images are formed from angle-filtered X-rays that are scattered by electron density variations within the sample. Stereo USAXS imaging provides

Microstructure-Property Correlations in Industrial Thermal Barrier Coatings

July 1, 2004
Author(s)
A Kulkarni, A N. Goland, H Herman, Andrew J. Allen, J Ilavsky, Gabrielle G. Long, C A. Johnson, J A. Ruud
This paper describes the results from multidisciplinary characterization/scattering techniques employed for the quantitative characterization of industrial thermal barrier coating (TBC) systems used in advanced gas turbines. While past requirements for

X-Ray Topography

February 4, 2004
Author(s)
David R. Black, Gabrielle G. Long
The study of the interrelationships between processing, structure and properties of materials is fundamental to the field of materials science and engineering. The need to understand the microstructure of materials has driven the development of a wide

Comprehensive Microstructural Characterization and Predictive Property Modeling of Plasma-Sprayed Zirconia Coatings

May 1, 2003
Author(s)
A Kulkarni, Z G. Wang, T Nakamura, S Sampath, A N. Goland, H Herman, Andrew J. Allen, J Ilavsky, Gabrielle G. Long, J Frahm, R W. Steinbrech
Quantitative microstructure characterization to better understand processing-microstructure-property correlations is of considerable interest in plasma sprayed coating research. This paper quantifies, by means of small-angle neutron scattering (SANS) data

Comprehensive Microstructural Characterization and Predictive Property Modelling of Plasma-Sprayed Zirconia Coatings

May 1, 2003
Author(s)
A Kulkarni, Z G. Wang, T Nakamura, S Sampath, A N. Goland, Gabrielle G. Long, H Herman, J. Allen, J Ilavsky, G J. Long, J Frahm, R W. Steinbrech
hieving control of the microstructure of plasma-sprayed thermal-barrier coating (TBC) systems offers an opportunity to tailor coating properties to demanding applications. Accomplishing this requires a fundamental understanding of the correlations between

Small-Angle Neutron Scattering Study of the Role of Feedstock Particle Size on the Microstructural Behavior of Plasma-Sprayed Yttria-Stabilized Zirconia Deposits

March 1, 2003
Author(s)
H Boukari, Andrew J. Allen, Gabrielle G. Long, J Ilavsky, Jay S. Wallace, C C. Berndt, H Herman
The microstructures of thick plasma-sprayed yttria-stabilized (8% mass) zirconia deposits have been studied in a series of Porod small-angle neutron scattering (SANS) and multiple small-angle neutron scattering (MSANS) experiments. Three main void

Recent Developments in the Characterization of Anisotropic Void Populations in Thermal Barrier Coatings Using Ultra-Small Angle X-ray Scattering

January 1, 2003
Author(s)
Gabrielle G. Long, T A. Dobbins, Andrew J. Allen, J Ilavsky, P Jemain, A Kulkarni, H Herman
Thermal barrier coatings (TBC) have complex void microstructures which control their in service properties. In the research reported here, ultra-small-angle X-ray scattering (USAXS) has been used to characterize anisotropic void populations in TBC s. A new

Multiple Small-Angle Neutron Scattering Studies of Anisoptropic Materials

December 1, 2002
Author(s)
Andrew J. Allen, Norman F. Berk, J Ilavsky, Gabrielle G. Long
Various authors have recognized the power of multiple small-angle neutron scattering (MSANS) analysis in providing information on coarse, concentrated microstructures involving micrometer length-scales larger than are accessible in conventional small-angle