Materials Literature
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Dynamic mechanical behaviors of 45 steel have been studied with the split Hopkinson pressure bar(SHPB) and static material test system over a wide range of strain rates and temperatures.The Johnson-Cook constitutive relationship parameters are determined through these experiments.The parameters are validated by compar…
In an accompanying article, we have described a methodology for the simulation of dislocations in structurally complex materials. We illustrate the applicability of this method through studies of screw dislocations in a structurally simple ionic ceramic (MgO), a molecular ionic mineral (forsterite, Mg2SiO4), a semi-io…
This paper addresses the issue of determining the level of defect that is likely to cause the failure of solid dielectric transmission class cables. It also proposes methods for predicting the level of defect that is likely to cause failure and to provide a simple analytic approximation for doing so in the case of con…
A micromechanical model is developed for the elastic continua with virtual multi-dimensional internal bonds. The basic idea of the presented model is that materials are discretized into mass particles and these mass particles are connected with randomized normal and shear bonds. Based on the Cauchy-born rules and the…
Metallothionein fusion proteins allow for site-specific, orthogonal functionalization of proteins to a variety of nanoparticles.
The intercalation of phenol into p-[2-(2-hydroxyethyldimethylammonio)ethoxy]azobenzene–clay (montmorillonite, synthetic saponite and fluor-tetrasilicic mica) intercalation compounds induced by UV irradiation is reported. Phenol was intercalated into the interlayer spaces of the azo dye–fluor-tetrasilicic mica (the cat…
The amount of electronic charge transferred between gold particles and polyaniline depends not only on the electron affinity of the two materials but also on the size of the gold particles. As measured by X-ray photoelectron spectroscopy, for particles < approximately 5 nm the binding energy of the electrons is size d…
We have prepared polycrystalline n-type Ba8CuxGayGe46−x−y (x=0–5, y=16−3x) clathrate compounds by arc melting and spark plasma sintering techniques and investigated the effect of Cu substitution for Ge on their thermoelectric properties. The Hall carrier concentration for Cu-substituted compounds is almost constant at…
Two-dimensional nanowalls of GaS and GaSe are obtained by thermal exfoliation around 900 degrees C, and transformed to Ga2O3 and GaN nanowalls upon reaction with air and ammonia respectively at 800 degrees C, while maintaining dimensional integrity.
The catalytic activity for Au/TiO2 for CO oxidation can be significantly enhanced by the addition of nitrates and this may relate to the variable catalyst performance observed in many studies.
The fluorescence of two divalent europium-activated oxonitridoaluminosilicates, namely SrSi5AlO2N7 and SrSiAl2O3N2, is reported in this work. The powder sample was synthesized by sintering at 1800°C (SrSi5AlO2N7) or 1600°C (SrSiAl2O3N2) for 2 h under 0.5 MPa N2. A single broadband blue-green emission is observed for b…
Hydrogen absorption into high strength steel bolts and its effects on delayed fracture susceptibility have been investigated, by means of thermal hydrogen analysis on exposed bolts and hydrogen permeation tests under atmospheric exposure. Thermal hydrogen analysis on small parts of exposed bolts showed hydrogen locali…
As the novel Eu-doped phosphors were synthesized by solid-state method, their characterization and luminescent properties were also investigated. X-ray dirraction results revealed that the ions are well dissolved into the host below . The ions preferred to occupy the distorted octahedral sites in the structure making…
The international Phebus FP programme, initiated in 1988 is one of the major research programmes on light water reactors severe accidents. After a short description of the facility and of the test matrix, the main outcomes and results of the first four integral tests are provided and analysed. Several results were une…
The damping property tanφ of Cu-Al-Mn-based alloys, where tanφ is nearly equal to internal friction Q−1, was investigated using a Dynamic Mechanical Spectrometer (DMS). It was found that the dependences of frequency and strain amplitude on tanφ are significantly different between the parent + martensite two-phase and…
The study of localized corrosion is hindered by the inability to characterize electrolyte compositions inside crevices and pits during the corrosion process. This paper describes the development of a microelectrode system for in situ monitoring of the pH in artificial crevices and small recesses. This system permits d…
Annealing behaviors of hot-deformed magnesium alloy AZ31 were studied at temperatures of 373 to 673 K by optical and SEM/EBSD metallographic observation. The hot-deformed alloy had fine-grained structures developed by grain fragmentation due to continuous dynamic recrystallization (cDRX). Temperature dependence of the…
Using a single interferometric lithography patterning step along with self-aligned pattern-definition techniques, uniform, large-area metallic coaxial arrays with ~ 100-nm toroidal gaps are fabricated. Enhanced (5x) mid-infrared (4 mum) transmission through these sub-wavelength coaxial arrays is observed as compared w…
Pure titanium is expected to be used in high-speed ships in light of its corrosion resistance, high specific strength, ability to reduce ship-dismantling costs, and recyclability. Titanium rudder forgings, each of which is an integrated combination of a rudder plate and a rudder stock, have been used for high-speed sh…
The molecular and electronic structures of the electron transfer series of four-coordinate square-planar nickel complexes with the ligand o-phenylenebis(N'-methyloxamidate), [NiL]z (z = 2-, 1-, 0), have been evaluated by DFT and TDDFT calculations, and most of their experimentally available structural and spectroscopi…