Materials Literature
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A simple two-dimensional passivation and depassivation model for pitting corrosion has been developed. This model describes corrosion processes that are limited by the diffusion of either a corrosive agent or the diffusion of corrosion products that inhibit the corrosion process. Despite its simplicity, this model exh…
Localized pitting is best described by a characteristic parameter called the pitting potential value (Ep). Although Ep is governed by a number of factors, including alloy composition, metallurgical history, and the corrosive environment, the strongest effect on Ep is produced by certain additives that differ from the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFurther neighbor magnetic exchange interaction in a novel pseudolinear tetramer of copper(II)B. Chiari, O. Piovesana, T. Tarantelli, and P. F. ZanazziCite this: Inorg. Chem. 1993, 32, 22, 4834–4838Publication Date (Print):October 1, 1993Publication History Published online1…
An algorithm is proposed for the solution of non-convex variational problems. In order to avoid representing highly oscillatory functions on a mesh, an associated Young measure, which characterizes such oscillations, is also approximated. Sample calculations demonstrate the viability of this approach.
The corrosion behavior of a series of electrodeposited Al‐Mn alloys has been investigated. Three different microstructures were examined. A supersaturated face‐centered cubic (fcc) structure was produced with up to 5 atomic percent (a/o) Mn. Deposits containing 5–22 a/o Mn were composed of a glassy phase in combinatio…
Principles for the calculation of residual stresses due to thermal expansion mismatch and previous solutions are reviewed. A general model for this subject is proposed. Considering the effective thermoelastic properties of a unidirectional composite in axial and transverse directions allows a more comprehensive treatm…
Abstract We have presented a simple technique for the fabrication of nanocrystals of organic molecules and polymers and have shown that it is possible, using the liquid‐phase technique, to fabricate organic nanocrystals ranging in size from 10 nm to 1 μm by manipulating the preparative conditions. In particular, nanoc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluoride-bridged dimers: binuclear copper(II) complexes and iron(III)-copper(II) assembliesSonny C. Lee and R. H. HolmCite this: Inorg. Chem. 1993, 32, 22, 4745–4753Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 Octo…
The embedded atom method was used for the design of an atomic potential model for the simulation of the alpha - gamma iron interface. The model takes the form of three cubic expressions covering different ranges, and is normalized to give equilibrium to the two-body potential as well as to the embedding function at th…
The purpose of this research was to obtain room temperature fatigue behavior of AZ91E-T6 cast magnesium alloy and to determine if commonly used models that depict fatigue behavior are applicable to this cast alloy. Axial strain-controlled fatigue behavior using cylindrical specimens were employed to determine low cycl…
Abstract Angle‐dependent x‐ray photoelectron spectroscopy (AD‐XPS) measurements have been carried out on thin aluminium oxide layers formed on pure aluminium by oxidation in oxygen at 25°C and at 250°C. The amounts of oxygen of the oxide overlayers were measured by nuclear reaction analysis (NRA). The equipment thickn…
A simple phenomenological model with two coupled structural and ferroelectric order parameters is under consideration. The small-signal dielectric response, dielectric response to a strong electric field (hysteresis phenomena included), and the phase diagram in the presence of the bias field are analyzed in the framew…
ABSTRACT Irreversible intermolecular reaction rates k in dilute polymer solutions and unentangled melts are studied as a function of time, molecular weight, and location of reactive groups along the polymer backbones. As for intramolecular reactions, the kinetics are determined by the reaction exponent 0 (3 + g) / z,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and magnetic properties of a nitronyl nitroxide and of its imino analog. Crystal packing and spin distribution dependence of ferromagnetic intermolecular interactionsFabrice Lanfranc de Panthou, Dominique Luneau, Jean Laugier, and Paul ReyCite this: J. Am.…
Angle calculations are presented for a new type of diffractometer suitable for surface X-ray diffraction. The new geometry results from combining the four-circle and the z-axis geometries and involves six circles. Instruments based on this concept can be operated in different diffraction geometries. Compared to the fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and nonlinear optical properties of donor-acceptor substituted triaryl azole derivativesChristopher R. Moylan, Robert D. Miller, Robert J. Twieg, Kathleen M. Betterton, Victor Y. Lee, Tracy J. Matray, and Cattien NguyenCite this: Chem. Mater. 1993, 5, 10, 1499–1508…
Active oxidation behavior of CVD‐SiC in CO─CO 2 atmospheres was investigated using a thermogravimetric technique in the temperature range between 1823 and 1923 K. The gas pressure ratio, P CO2 / P CO , was controlled between 10 −4 and 10 −1 at 0.1 MPa. Active oxidation rates (mass loss rates) showed maxima at a certai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContact faces of epitaxially crystallized .alpha.- and .gamma.-phase isotactic polypropylene observed by atomic force microscopyW. Stocker, S. N. Magonov, H. J. Cantow, J. C. Wittmann, and B. LotzCite this: Macromolecules 1993, 26, 22, 5915–5923Publication Date (Print):Octob…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of triethoxysilyl-terminated polyoxazolines and their cohydrolysis polymerization with tetraethoxysilaneYoshiki Chujo, Eiji Ihara, Shigeo Kure, and Takeo SaegusaCite this: Macromolecules 1993, 26, 21, 5681–5686Publication Date (Print):October 1, 1993Publication His…
Microspheres made from Y2O3-Al2O3-SiO2 (YAS) glasses, which contain radioactive Y-90, are currently being used to treat liver cancer in humans, where their chemical durability is of prime importance. In deionized water or saline at 37 degrees C, the weight percent Yttrium (Y) dissolved from eight different YAS glasses…