Materials Literature
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Intergranular embrittlement induced by equilibrium segregation of solutes is now recognized in a number of engineering alloys, particularly in ferrous systems. In such multicomponent systems, grain-boundary segregation effects can be quite complex, with competitive interactions among a number of surface-active species…
Electrodeposition of metallic coatings for decorative purposes is such an extensive topic that it is intended to review in detail only the most important metals. Some indication of types of plating solutions and general formulations is given, but voluminous patent literature exists on this subject. The physical and me…
Platinum group metal catalysts are incorporated in the Cataheat flameless combustion systems designed by Matthey Bishop to burn hydrocarbon fuels. These systems are safer and more efficient than radiant heaters with an open flame. They are used in portable heaters for a wide range of agricultural, industrial and recre…
This paper deals with an examination of the hypothesis for striation thickness by Mohr. The effect of viscosity ratio on striation thickness is examined in a cone rotor-type mixer as a uniform shear system, and it is concluded that the effect of the viscosity ratio might be negligible in a system where a minor compone…
Abstract After n‐irradiation of CaWO 4 up to a dose of 3 × 10 19 nvt a spectrum consisting of 12 narrow lines is observed. The angular variation of the spectrum shows that a centre with S = 3/2 located at four magnetically inequivalent sites in the structure is involved. The data are consistent with a spin Hamiltonian…
As a part of a major AGARD project concerning thermophysical properties of solid materials at high temperatures, cooperative thermal expansion measurements up to 1000°C were carried out using pushrod techniques. Sixteen laboratories have contributed results. Parallel samples having the same history were used for all t…
É descrita a técnicade criação de balanus amphitrite var. amphitrite em laboratório, sob condições controladas, que permitem observações das mudas, do número de estágios e, ainda são apresentadas as características de cada estágio. Balanus amphitrite amphitrite é criado pela primeira vez em laboratório com sucesso. Do…
The physical properties, i.e. magnetostriction, magnetization, electrical resistivity and density, of Fe-Si alloys in the composition range of 0～24% Si, were studied with regard to the effects of two kinds of thermal treatments, viz. the furnace cooling and the water quenching, both after annealing at 1100℃ for 2 hour…
Viscosity of liquid Pb-Sn alloys has been measured by the oscillating crucible method in the temperature ranges from the liquidus to about 800°C. By a careful experiment, it has been possible to obtain results which are accurate to within ±1.0 pct. The variation of viscosity with temperature followed the Arrhenius-typ…
Liquid iron-titanium-oxygen equilibria has been established by equilibrium measurements between liquid iron-titanium alloys and synthesized titanium oxide crucibles and by the thermodynamic data reported previously by the authors.The results obtained are summerized as follows:1) It has been shown to be necessary to co…
Abstract Far infrared reflectivity of Cdas 2 bulk crystals in polarized light has been measured at room and liquid‐nitrogen temperature in the 30 to 400 cm −1 frequency range. It is shown that the model of classical non‐interacting oscillators represents the experimental curves adequately. The results are in agreement…
It is well-known that no permanent distribution of free charge can exist in a conductor. A common development of a "relaxation time" concludes that a charge distribution imposed in a conductor will decay exponentially with a time constant ε/σ. This development utilizes Ohm's law, J = σE, with σ constant, which is inap…
Factors which affect the texture and microstructure of Zr-2.5 wt % Nb extruded tubes have been investigated. The major factor that determines th~ texture is the way the metal flows, which is controlled by the die shape, the extrusion ratio and the lubricant. The microstructure is controlled by the temperature during e…
THERE HAS BEEN A NEED FOR A NONDESTRUCTIVE, DYNAMIC TECHNIQUE FOR EVALUATING CERTAIN ELASTIC CONSTANTS OF ASPHALT PAVING MATERIALS. IN THIS STUDY, A METHOD IS DEVELOPED BY WHICH THE DYNAMIC E-MODULUS, G-MODULUS, AND POISSON'S RATIO OF COMPACTED ASPHALT- AGGREGATE SPECIMENS ARE DETERMINED FROM MEASUREMENT OF THE PROPAG…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation A. Tauber, R. O. Savage, M. D. Grebenau; Magnetic Properties of Single Crystal Ba5Me2Ti3Fe12O31,…
Sodium metaphosphate glasses containing chromium, manganese, cerium, copper, uranium, molybdenum, vanadium and titanium were equilibrated with air at different temperatures. The relative proportions of the oxidised and reduced forms were determined. Spectral absorption of glasses containing each of the above colouring…
Oxidation, cooling, dissolution, and annealing flexure measurements were performed on thin coupons of niobium presaturated with oxygen. Oxidation was done near 425°C in dry oxygen, dissolution in hydrofluoric acid, cooling and annealing in vacuum. From curvature measurements during each process, bending stresses were…
Recent research on solid lubricants for use at high temperatures in air and other gaseous environments is presented. The characteristics of oxide and fluoride lubricants at temperatures to 1,700 F are described. Data is presented for fluoride coatings with silicate and other additives incorporated to give improved wea…
On étudie dans ce mémoire l'énergie de liaison du complexe exciton-donneur-neutre, ainsi que l'influence des effets de polarisation sur cette dernière, en utilisant un potentiel d'interaction déduit des théories du N-corps et du polaron. On s'est de plus placé dans le cadre de l'approximation de Born Oppenheimer, la r…
Abstract Aus lichtoptischen Messungen der Gleitbanddichten, ‐längen, ‐stufenhöhen und ‐ausbreitungsgeschwindigkeit im Temperaturbereich von 245 bis 427 °C an Oberflächen von plastisch verformten Einkristallen der intermetallischen Verbindung MgZn 2 in Abhängigkeit von der Abgleitung werden Schlußfolgerungen für das Ve…