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Article
Open AccessMaterials informatics for the screening of multi-principal elements and high-entropy alloys
The field of multi-principal element or (single-phase) high-entropy (HE) alloys has recently seen exponential growth as these systems represent a paradigm shift in alloy development, in some cases exhibiting u...
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Article
Intentional and unintentional elemental segregation to grain boundaries in a Ni-rich nanocrystalline alloy
Grain boundary segregation is an important phenomenon for nanocrystalline materials as it influences thermal stability and mechanical properties. While several studies have considered effects of single, intent...
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Article
Novel interpenetrating Cu–Al2O3 structures by controlled reduction of bulk CuAlO2
Bulk CuAlO2 with the delafossite structure was processed using two different methods. In one case, stoichiometric CuAlO2 powder was processed using the solution technique, and consolidation was carried out by pre...
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Article
Fabrication of ferrous metallic foams by reduction of ceramic foam precursors
A process has been developed for obtaining closed cell metallic foams using a ceramic foam precursor. In the present study, the major constituent of the ceramic foam precursor was iron oxide (Fe2O3), which was mi...
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Article
Direct measurement of oxygen in lead-based ceramics using the ζ-factor method in an analytical electron microscope
X-ray absorption of oxygen is significant in thin specimens of Pb(Mg1/3Nb2/3)O3-35 mol% PbTiO3 [PMN-35PT] due to the presence of heavy elements such as Pb and Nb. Therefore, direct measurement of the oxygen conce...
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Article
Coble-creep response and variability of grain-boundary properties
A microstructural model of steady-state creep that couples grain-boundary transport, micromechanics, and grain sliding is employed to investigate the grain-boundary diffusional creep response of an idealized m...
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Article
A study of grain-boundary structure in rare-earth doped aluminas using an EBSD technique
Oversized rare-earth dopant ions such as Y3+, Nd3+, and La3+ segregate to grain boundaries and reduce the tensile creep rate of α-Al2O3 by 2-3 orders of magnitude. It has been speculated that these dopant ions ca...
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Article
Structure of Y and Zr Segregated Grain Boundaries in Alumina
Grain boundary segregation of Y and Zr in α-Al2O3 and the atomic structural environment around the Y and Zr atoms have been investigated using high resolution STEM and EXAFS. At dilute concentrations, the Y ions ...
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Article
Effects of Y and Zr Dopants on Grain Boundary Structure in Creep Resistant Polycrystalline Alumina
Dopants Y and Zr at 100 ppm levels in high purity, micron grain-size polycrystalline alumina are mainly segregated to the alumina grain boundaries and strongly reduce high temperature creep. Information about ...
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Article
The use of Hertzian contact in determining coating thickness
Abstracts are not published in this journal
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Article
Evaluation of subgrain formation in Al2O3–SiC nanocomposites
Both theoretical analysis and transmission electron microscopy (TEM) complementary studies have been conducted to evaluate the possible role of subgrain formation as a strengthening mechanism in a nanocomposit...
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Article
Electrochemical Processing of Layered Composite Coatings of Nickel - Aluminum - Alumina / Alumina - Yttria Stabilized Zirconia
Multilayered coatings of single and dual particle metal matrix composites, with or without ceramic overlayers, have been produced by a novel combination of electrochemical deposition (electroplating and electr...
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Article
The effects of particle size distribution and induced unpinning during grain growth
The effect of a second-phase particle size distribution on grain boundary pinning was studied using a Monte Carlo simulation technique. Simulations were run using a constant number density of both whisker and ...
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Article
Deformation mechanism map for creep in YBa2Cu3O7−x
A deformation mechanism map with grain size and stress as variables was constructed for creep in YBa2Cu3O7−xat 850 and 950 °C. Theoretical models of Nabarro-Herring, Coble, and power-law creep were used for the c...
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Article
Fracture behavior of fused quartz with laser-induced internal flaws
Pulsed-laser light was used to generate internal flaws in fused quartz. The size of the flaw produced was proportional to the amount of laser pulse energy above a threshold value of 2.5 mJ. Specimens of differ...
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Article
Mechanical Properties and Grain Growth Inhibition in The System Al2O3 : c-ZrO2
The grain coarsening in a 50:50 volume percent Al2 O3 : c-ZrO2 composite is shown to be severely limited even after long heat treatments at high temperatures (100 hours at 1650°C). The strength behavior, measured...
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Article
Analytical transmission electron microscopy of La2O3-doped Y2O3
Analytical electron microscopy has been used to study the precipitation reactions in sintered samples of 9 mol% La2O3-Y2O3 samples upquenched from the single phase cubic region into the cubic and hexagonal phase ...
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Article
Compositional Control of Ceramic Microstructures: An Overview
A review is given of the controlled use of compositional variation in the sintering of ceramics. The difficulties in determining the mechanisms of operation of sintering additives are outlined and the mechanis...
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Chapter
A++/Ti Nonstoichiometry in Alkaline Earth Titanates, ATi03
Ternary oxides offer the possibility of variations in the ratios of the two metallic constituents as well as in the metal-nonmetal ratios. The extent of this cation-cation nonstoichiometry, and its effect on m...
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Article
Calcium Site Occupancy in BaTiO3
Measurements of the equilibrium electrical conductivity of Ca-doped BaTiO3 indicate a highly acceptor-doped behavior when y > 1 in the general formula (Ba1−xCaxO)yTiO2. It has been suggested that when there is an...
