Materials Literature
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Instrumented Taylor anvil-on-rod impact tests have been conducted on oxygen-free electronic copper to validate the accuracy of current strength models for predicting transient states during dynamic deformation events. The experiments coupled the use of high-speed digital photography to record the transient deformation…
The Landau theory of phase transition has been successfully applied to solve a number of important problems in the dynamics of martensitic phase transformations in alloys. On the other hand, although a precise mathematical description of the microstructures is known within the framework of Cauchy-Born hypothesis, its…
An intermetallic compound of nominal composition Tb0.3Dy0.7Fe1.95 was conventionally cast in the form of cylindrical rods of 8mm diameter and directionally solidified by zoning at three different growth rates. Compounds of the same nominal composition were also directionally solidified in the form of cylindrical rods…
Abstract Fatigue behaviour and mechanical properties of peak-aged AA6063T6 with ultra-fine grain size, produced by equal channel angular extrusion, were evaluated with special emphasis on the microstructure before and after cyclic loading. The strength significantly increased with grain size reduction and is described…
This is the first study applying Weibull statistics to the strength distribution of a thermoelectric (TE) material and to determine the fracture strength of a member of the LAST-T (lead–antimony–silver–tellurium–tin) family of high-temperature TE compounds. The p-type TE material Ag0.9Pb9Sn9Sb0.6Te20 was cast from the…
The complex two-dimensional (2D) model developed in Part 1 to predict pipeline steel corrosion rate under a disbonded coating with or without cathodic protection (CP) has been simplified in this work for easy application of this model. It has been found that steel corrosion under a disbonded coating due to dissolved o…
Charges accumulate on the spacecraft surface through various processes such as conduction, irradiation, ionization, and polarization. These charges can affect the space system operations via an electric current flowing in the structure or a locally generated electric field. This paper is focused on the analysis of ele…
The effects of tin substitution on the phase formation, the Curie temperature, and the magnetic entropy change of the monoclinic Gd5Si1.95Ge2.05 alloy have been investigated. Five Sn-doped Gd5Si1.95−xGe2.05−xSn2x samples were prepared with 2x=0, 0.01, 0.03, 0.05, and 0.10, respectively. Experimental results show that…
An electromagnetic analysis of wave propagation in planar anisotropic transmission-line metamaterials is presented. It is shown that a planar square-celled grid, series-loaded with orthogonal inductors and capacitors and positioned over a ground plane, is magnetically anisotropic and may be described in terms of a dia…
Work on dielectric spectroscopy of epoxy resin filled with nano-SiO2at different relative humidities and temperatures is reported. Above the glass-transition temperature (Tg), dc-like imperfect charge transport (QDC or LFD) dominates the low frequency dielectric spectrum. Another mid-frequency relaxation process was f…
The effect of composition distribution on microphase-separated structures of AB diblock and BAB triblock copolymers was investigated at the molecular level by measurements of neutron reflectivity. Monodispersed three poly(styrene)- d 8 - block -poly(2-vinylpyridine) (DP) and three labeled triblock copolymers (PDP) and…
Abstract Alkene and nitrophenyl molecules have been covalently bonded to single crystal diamond using photochemical and electrochemical techniques. The surface density of electrochemically grafted nitrophenyl groups is about 5% of a monolayer (8 × 10 13 molecules/cm 2 ) on initially H‐terminated diamond. Covalently‐bo…
The crystal structure and thermoelectric properties of type-I clathrate compounds in the Ba–Ga–Ge system have been investigated as a function of Ga content. The solid solubility of Ga in the type-I clathrate compounds is determined to be X=16 when expressed with the formula of Ba8GaXGe46−X. As the Ga content increases…
The nano powders of LaCrO3 were prepared by a sol-gel route. The heat capacity of LaCrO3 nano powders from 350 to 550 K was measured by DSC method and expressed as: Cp(LaCrO3) (±0.112) = 166.844 − 8.500 × 10−3T − 1.022 × 106T−2 (J/(mol·K)) (350–550 K). An EMF measurement assembly was developed with CaF2 as an electrol…
An experimental study of the melt densification of polyethylene powders filled with natural fibres is presented. The aim was to understand the underlying principles applicable to the consolidation of thermoplastic polymer-natural fibre systems processed by rotational moulding. This process has been developed at POLYCO…
Double condensation of 2-acetylpyridine with 1,3-diaminobenzene-4,6-dicarboxaldehyde affords 2,7-bis(2-pyridyl)-1,8-diazaanthracene, which was subsequently oxidized to the corresponding quinone. Electrochemical studies indicate two reversible reduction processes corresponding to semiquinone and hydroquinonate formatio…
We have studied the influence of the methane gas ( CH 4 ) flow rate on the composition and structural and electrical properties of nitrogenated amorphous carbon ( a - C : N ) films grown by surface wave microwave plasma chemical vapor deposition (SWMP-CVD) using Auger electron spectroscopy, X-ray photoelectron spectro…
Magnesium-neodymium based alloys were prepared by induction melting in an alumina crucible under protection of pure argon atmosphere. XRD patterns show that the as-melted Mg-Nd and Mg3NdNi0.1 diffraction peaks can be excellently indexed with DO3 structure (BiF3 type, space group Fm3m). The lattice constant of Mg3Nd ph…
Mixed oxide nanoparticles of 80 mol.-% cerium and 20 mol.-% samarium with rod like morphology were synthesised via a chemical coprecipitation technique. X-ray diffraction (XRD) and high resolution TEM characterisation showed homogeneous distribution of both rare earth metal oxides throughout individual particles.
Abstract Kinetic ordering of the cations in (Sr,Pb)(NO 3 ) 2 and (Ba,Pb)(NO 3 ) 2 solid solutions with anomalous birefringence was studied by means of single crystal X-ray diffraction. The crystal structures of two samples of (Sr 0.62 Pb 0.38 )(NO 3 ) 2 and (Ba 0.20 Pb 0.80 )(NO 3 ) 2 , respectively, taken from the {1…