Chang-Soo Kim

Gregory S Rohrer12
Ted R Massa3
12Gregory S Rohrer
3Ted R Massa
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Electron backscattered diffraction has been used to determine the orientation of WC crystals in a WC-Co composite and atomic force microscopy has been used to measure the shapes of planar sections of the same crystals. A stereological analysis has been used to determine that { } 10 1 0 prism facets and the {0001} basal planes are the WC surfaces that are(More)
The geometric and crystallographic characteristics of interfaces in WC–Co composites with a range of grain sizes and carbide volume fractions have been comprehensively characterized. The carbide crystals are most frequently terminated by (0001) and ð10 10Þ surfaces. The average number of carbide vertices per grain and the basal-to-prismatic face area ratio(More)
To identify factors that might affect capillary driving forces and interface structure-dependent mechanisms for coarsening, we have used a stereological analysis to determine the changes in the morphology of SrTiO 3 crystals in contact with a titania-rich liquid at 15001C. A combination of flat and curved surfaces is observed in contact with the liquid. The(More)
We report the first application of a five-parameter determination of grain boundary types to grain boundary engineered alpha-brass. The most important findings were that the distribution of planes showed a prevalence of <110> tilt boundaries, especially asymmetric tilt types, and the presence of <111> twist boundaries. This distribution resulted from the(More)
This paper analyzes the changes in the five-parameter grain boundary character distribution in a-brass brought about by iterative thermomechanical processing (ITMP). In both reference and ITMP specimens, there was a tendency for boundaries to terminate on {1 1 1} planes. The high incidence of coherent twins and other boundaries terminated on {1 1 1} planes(More)
The five parameter grain boundary character distribution quantifies the relative areas of different types of grain boundaries, distinguished by their lattice misorientation and grain boundary plane orientation. The viewpoint presented in this paper is that this distribution is a sensitive metric of polycrystalline structure that can be related to(More)
The grain boundary character distribution in an Fe-1%Si steel has been measured as a function of lattice misorientation and boundary plane orientation. There is a weak texture in the space of grain boundary planes that favors the {110} orientation. At specific misorientations, the anisotropy is larger. For example, when the lattice misorientation is 60°(More)
Two-dimensional finite element simulations were used to study the effects of orientation texture on the transverse rupture strengths of WC–Co composites. The model incorporates observed microstructural geometries, anisotropic thermal and elastic properties, and a fracture criterion that reproduces the strengths of known specimens. The results show that the(More)
A two-dimensional finite element method (FEM) was used to predict the stress-strain distributions and the fracture strengths of WC-Co composites with carbide grain sizes from 1.4 to 5.3 mm and carbide volume fractions from 0.7 to 0.9. Stress-strain distributions were calculated in plane sections of microstructures mapped by orientation imaging microscopy.(More)
Cardiovascular drug-eluting stents (DES) are widely applied medical products to treat diseased narrowed arteries. Despite their wide application, there still are many clinical adverse effects associated with DES implantation. One of the major issues is that the coatings comprised of drug and polymer phases are often delaminated during the deployment of the(More)