Materials Literature
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Bu çalışma linear polarizasyon metodunun bu günkü durumunu ve bugüne kadar korozyon hızı tayinine uygulanmasını göstermektedir. Bu metodun çok pra¬tik ve faydalı olduğu gösterilmiştir. Metodun genel bir uygulama alanı göstermesi ve uygulanmasının kolay olması büyük bir avantaj sağlamaktadır. Bu metotla ko¬laylıkla kor…
A study was made on the quench sensitivity of Cu-0.3∼1.5%Cr alloys. The time-temperature-precipitation curve (T-T-P curve) was drawn by plotting the electrical conductivity of specimens which were solution treated and then directly quenched over the temperature range of isothermal heat treatment. The quench sensitivit…
Negative corona onset and sparkover voltages in air are shown to be affected by temperature, density, and the pipe-to-wire ratio of radii when using concentric cylindrical electrodes. Use of large wires at high temperatures demonstrates that onset of electrical discharge occurs at voltages significantly less than thos…
Abstract Screw, edge, and mixed dislocations are treated by a new method which is simple to handle. Labour saving equations are derived which further shorten the algebraic processes. The results emphasize the need for anisotropic expressions in the case of common cubic materials, and are presented in a form which show…
Abstract The effect of heavy doping on the reflection spectra of silicon and germanium is investigated by measuring the fractional change in reflectance, Δ R / R , between pure and doped materials. This effect arises from the narrowing of the forbidden gap in heavily doped materials. The form of the Δ R / R spectrum a…
Low-frequency i.r. and Raman spectra of InCl3,2Et2O, InBr3,2Et2O, InCl3,2Et2S, and InBr3,2Et2S are given and interpreted in terms of D3h skeletal symmetry.
Abstract Principal magnetic susceptibilities of single crystal of dysprosium ethylsulfate have been computed in the temperature range of liquid‐nitrogen to room temperature, assuming that the crystal field has C 3h symmetry around the Dy 3+ ion. It is observed that magnetic anisotropy increases with the decrease of te…
Abstract From temperature change experiments (between 260 and 435°C) during secondary creep of the intermetallic compound MgZn 2 an activation enthalpy Δ H = (2.25 ± 0.20) eV for basal slip has been derived. The shear strain rate γ can best be described by the empirical relation γ = 7 × 10 11 s −1 × τ 5.5 ± 1.0 exp (‐…
Abstract not Available.
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Controlled hydrolytic degradation of ultraphosphate glasses at their branching sites has indicated that these compounds, with a ratio of univalent-cation to phosphorus between 0·7–1·0, consist of random arrangements of trimetaphosphate rings, polyphosphate chains, and branched chains. No ring structures larger than tr…
Abstract The effect of Coulomb interaction on the Compton scattering cross‐section (CSCS) of a free electron gas has been calculated theoretically by Ohmura and Matsudaira within the framework of the random phase approximation (RPA). These calculations have shown that plasmon emission during the scattering process dim…
Hardness measurements and microscopic observations by both optical and transmission electron microscopy were carried out mainly on a beryllium-3wt% iron alloy.The alloy was solution-treated at 1150°C, followed by oil-quenching, and aged at 400° to 700°C for a various time. In the quenched specimens, helices and loops…
The bismuth‐tellurium alloy system was investigated by electromotive force measurements, coulometric titrations, x‐ray diffraction, and differential thermal analyses. The thermodynamic properties of the system have been obtained from the electromotive force measurements. The partial molar free energy, enthalpy, and en…
A survey is presented of the fracture topography observed in titanium and titanium alloys. Ductile fracture by microvoid nucleation, growth, and coalescence is of widespread occurrence in these alloys. It is usually possible to qualitatively relate the dimple size to the macroscopic ductility of the alloy. Titanium al…
It was illustratively shown that the use of a definition of the effective diffusivity for a multi -component gaseous reaction system easily gives a sufficiently accurate approximate solution for diffusion through a stagnant gas film. In order to apply the same idea for approximate estimation of the effectiveness facto…
After fast electron irradiation at 80°K graphite exhibits, in its electrical resistivitiy during isochronal annealing, a reverse stage followed by normal stages. These constitute the Austerman and Hove peak. The reverse stage has previously been attributed to the separation of close Frenkel pairs of defects. In the pr…
Boron filament-epoxy composite tubes were evaluated for use as long column members in a spacecraft. Struts, 8 ft long and 3.2 in. in diameter, were designed, fabricated, and tested. After evaluation of test results, three-ply and four-ply laminates were selected to satisfy design load requirements of 5000 and 7000 lb.…
Irradiation of 2,6-diphenyl-p-benzoquinone in benzene gives a dimer whose precise structure is unknown, while irradiation in acetonitrile gives 2-hydroxy-4-phenyldibenzofuran.
Abstract L'étude du contraste a été effectuée en prenant comme modèle le mécanisme de décomposition spinoïdale prévu par Cahn [1 à 3] pour un alliage binaire cubique, dont l'énergie élastique est minimum suivant une direction β parallèle à <100>. Les contrastes effectivement observés au microscope électronique s…