Materials Literature
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A new ordered structure of Au5Sn is determined by X-ray and electron diffraction using single crystals. The unit cell of the hexagonal superstructure contains 15 Au and 3 Sn atoms, having the lattice constants a=\sqrt3 a0 and c=3 c0, where a0∼2.94 Å and c0∼4.78 Å are those of the fundamental hcp cell. The closest inte…
Metallic foreign atoms introduced into the surface layers of aluminum specimens are shown to be mobile during anodic oxidation. The direction of motion depends on whether the initial distribution of the foreign atoms is located in aluminum metal under the natural air‐formed oxide or entirely contained within a thin pr…
films have been prepared by reactive sputtering in an oxygen‐containing glow discharge, by ion‐beam sputtering in an accelerator, and by anodizing with an ethylene‐glycol‐based electrolyte. The sputtered films were amorphous if deposited on or Ta at temperatures from −100° to +200°C, though were crystalline if deposit…
This review gives a survey of the results Of five years† of study in the field of electron fractography conducted at the National Aerospace Laboratory (N.L.R.) to sleek a better understanding of fracture mechanisms. It is largely based on a series of publications l-12 that appeared during these years. In general only…
Hydrogen embrittlement is classified into three types: internal reversible hydrogen embrittlement, hydrogen reaction embrittlement, and hydrogen environment embrittlement. Characteristics of and materials embrittled by these types of hydrogen embrittlement are discussed. Hydrogen environment embrittlement is reviewed…
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Computerized analysis of composite structures formed by the adhesive bonding of materials is presented. The adhesive is considered to be a part of a linearly elastic system whose components are individually characterized by two bulk property elastic constants. Solution is obtained by finite difference minimization of…
The formation of droplets from cylindrical oil films supported by oleophilic filaments has been studied experimentally. In the absence of surfactant, the initial rate of growth of a disturbance on the cylindrical fluid surface was shown to depend on the interfacial tension, the film thickness, cylinder radius and liqu…
Description The symposium on Erosion, Wear, and Interfaces with Corrosion was presented at the Seventy-sixth Annual Meeting of the American Society for Testing and Materials held in Philadelphia, Pa., 24-29 June 1973. Committee G02 on Erosion and Wear sponsored the symposium. A. Thiruvengadam, The Catholic University…
Magnetic circular dichroism (m.c.d.) spectroscopy has been used to measure the angular momentum of the lowest excited state of the phthalocyanine ring as a function both of the central metal ion and of the axial ligands bound to the metal. The magnetic moments have been extracted from experiment using a moments analys…
Collagen fibrils were isolated from the body wall of the sea cucumber, Stichopus japonicrts, and purified by centrifugation. Phase contrast and electronmicroscopy showed elongated, spindle shaped fibrils. Their average diameter was calculated to be 1.44 D, where 1 D = the length of unit striation of the fibril ⋍ 640 Å…
The stress-induced acicular martensites in a Cu-14.2Al-4.3Ni (wt%) alloy were investigated extensively by the method of electron microscopy and selected area electron diffraction. As a result two types of martensites were found; one has the 18R type long period stacking order structure (β1′), and the other the 2H type…
Article Structure and properties of some copper(II) coordination compounds. Distortion isomerism of Cu(II) compounds was published on January 1, 1974 in the journal Pure and Applied Chemistry (volume 38, issue 3).
The iron-electrodeposited zinc diffusion couples were annealed at temperatures from 240 to 410°C. In the diffusion zone, intermediate phases appear in the order of ζ, δ1, and Γ phases. Kirkendall markers exist always at the interface between the ζ and zinc phases. This pronounced Kirkendall effect means that there is…
In this paper, we associate an anisotropic surface energy with a nematic liquid crystal-isotropic fluid interface. Using a variational principle, equations representing the balance of traction and couple at the interface and the interfacial edge conditions are obtained. Finally, two simple experimental situations are…
Abstract
A series of very simple radioactive chemical tests has been carried out to measure reaction of dibenzyl disulfide on steel. By comparing the results with friction experiments under the same conditions, some of the requirements of extreme pressure lubrication have been determined. Current views on the mechanism of reac…
Abstract Poly (dichlorophosphazene) rubber was discovered eighty years ago. Its rapid hydrolysis in moist air has hitherto precluded applications. The polymer was intractable and could not conveniently be modified chemically until Allcock (1965) reported that a soluble form could be obtained by careful control of the…
The applicability of the pseudo-spin model is discussed in relation to the existence of constituents with a restricted number of low-lying energy states. The situation certainly occurs in materials with low-lying electronic levels which undergo co-operative Jahn-Teller phase transitions. The Slater-Takagi model of KDP…
Abstract not Available.