Materials Literature
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Using the Cottrell-Bilby kinetics model for solute atoms, evolution of the solute concentration around dislocation line has been investigated with respect to the strain rate. Three types of interactions between dislocation and solutes were obtained: At low strain rates, the dislocation is effectively pinned by its con…
Reduced activation ferritic/martensitic steels (RAFs), such as F82H (Fe-8Cr-2W-0.2V-0.04Ta-0.1C), are the leading candidates for structural materials of fusion reactors, and it is essential for the development of RAFs to assure its good for fusion application. In this study, the influence of Ti on impact property was…
The growth of ettringite crystal by combining calcium hydroxide and aluminum sulfate solutions including some admixtures have been investigated using the microscope with high magnifications up to 3000 degrees. The nucleation, growth rate and morphology of ettringite were observed to clear the effect of admixtures.
Abstract Ammonium magnesium phosphate monohydrate NH 4 MgPO 4 ·H 2 O was prepared via solid state reaction at room temperature and characterized by XRD, FT‐IR and SEM. Thermochemical study was performed by an isoperibol solution calorimeter, non‐isothermal measurement was used in a multivariate non‐linear regression a…
The use of the boundary element method (BEM) in simulating steady‐state experiments of scanning electrochemical microscopy in feedback mode and in generation‐collection mode using complex three dimensional geometries has been shown in previous papers. In the context of generation‐collection mode experiments, catalytic…
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The influence on the growth morphology of the spherical crystal in the undercooled melt imposed by the far field flow is studied by the asymptotic method. It is shown that the far field flow leads to convection in the melt such that the front interface of a growing spherical crystal grows into the undercooled melt in…
A new tungsten heavy alloy with hybrid structure was manufactured for the kinetic energy penetrator. The tungsten heavy alloy is composed of two parts: core region is molybdenum added heavy alloy to promote the self-sharpening; outer part encompassing the core is conventional heavy alloy to sustain severe load in a mu…
The encapsulated induction melting and hot pressing were employed to prepare the Fedoped CoSb3 skutterudites and their thermoelectric properties were investigated. Single phase δ- CoSb3 was successfully obtained by the subsequent heat treatment at 773K for 24 hours. Iron atoms acted as electron acceptors by substituti…
The method of moments (MoM), physical optics (PO) and geometrical optics (GO) are compared for analysis of dielectric lenses. It is found that MoM can be used (with normal computers) for diameters of the lens up to 15 λ, λ being the wavelength, whereas the approximate methods PO and GO must be used at higher frequenci…
Conventional powder metallurgy processing can produce copper green compacts with density less than 8.3 g/cm3 (a relative density of 93%). Performances of these conventionally compacted materials are substantially lower than their full density counterparts. Warm compaction, which is a simple and economical forming proc…
The effect of the pore size of microfilters installed in a supercritical (SC-) CO2 bubbling device on the concentration of CO2 dissolved in the solution was investigated. Dissolved CO2 concentration in the solution treated with a microfilter was approximately 27% higher than that without a microfilter for lower CO2/sa…
There are two main goals of this thesis: to investigate the flow-induced crystallization behaviour of Polybutene-1 (PB-1 samples, and to study the effects of molecular parameters on the crystallization behaviour While flow-induced crystallization is not a
The present paper reviews the development and current technology status of solid oxide fuel cells(SOFCs);and the materials selection,stack design,cell and stack fabrication as well as perform- ance evaluation of SOFCs are discussed in detail according to the author's understanding and experience.
A propagation model for spectral beam combining is set up in this paper. First, using ray tracing method, the phase change induced by the blazed grating is expressed with the optical path differences in the groove and between grooves and the calculation model for the phase change of the beam obliquely incident on the…
This study examined the effects of monomer composition, original filler content, and application of centrifugal force on the resulting filler loading of composites. Either Bis-MPEPP or UDMA was mixed with TEGDMA at a molar ratio of 1 : 1. Silane-treated silica (14-20 wt%) was added to each mixture. After the mixtures…
One-photon and two-photon absorption properties of a double-conjugated-segment molecule (BSBAB) composed of two single-conjugated-segment molecules are studied by using density functional theory at ab initio level. The optimized geometrical structure shows that the two single-conjugated-segment parts in molecule BSBAB…
The effects of weathering on the surface properties of wood-plastic composites (WPC) were examined. High-density polyethylene (HDPE) based WPCs made from modified wood flour (untreated, extractives free, and holocellulose (delignified) fibers) were subjected to accelerated (xenon-arc) weathering. Colorimetry and Fouri…
Alloys 617 and 230 are currently identified as two leading candidate metallic materials in the down selection for applications at temperatures above 760°C in the Gen IV Nuclear Reactor Systems. Qualifying the materials requires significant information related to Codification, mechanical behavior modeling, metallurgica…
work evaluation of influence of porosity and microstructure on mechanical properties of AZ91 alloy coming from three suppliers was done. It was found that the structural factors influence the AZ91 alloy's strength properties are: the pores' area fraction, the area fraction of the Mg17Al12 phase of massive and lamellar…