Materials Literature
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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…
Abstract The decomposition of cellulose, in the absence and presence of additives, has been studied in a combined DTA‐TGA (differential thermal analysis — thermogravimetric analysis) system, in which both determinations were carried out simultaneously and on the same sample. The overall process was found to be endothe…
Simultaneous measurements of the recovery of stored energy and electrical resistivity were performed in a differential heat flux calorimeter after neutron irradiation at 4.6 °K (linear rising of temperature from 6 °K to 250 °K, with variable velocity between 0.3°K/min - 2°K/min). At each main recovery stage the heatin…
Silver decamolybdate, Ag6MO10O33, has a layer structure where infinite sheets of edge and cornershared MoO6 octahedra are held together by silver ions.
Beautiful green pyromorphite and yellow mimetite crystals were found from the Otaru-Matsukura barite mine, Hokkaido. The physical and chemical properties of these minerals were investigated. Pyromorphite, mimetite and intermediate solid solutions were synthetized, and their physical properties were compared with those…
Because does not absorb at wavelengths longer than about 2000Aå, the rare earth phosphates, , where Ln is any rare earth (other than La, Pm, or Lu), represent an ideal system for the study of rare earth absorption. Reflectance spectra of all compounds are presented for wavelengths between 2000 and 8000Aå. Only and pro…
The eflect of porosity on the thermal conductivity of sintered ThO2 of densities ranging from 90 to 95% of theoretical density was investigated at 20°C. The thermal conductivity was determined by means of laser pulse. Discrepancies were observed between the experimental results and the relation derived by Loeb. This d…
The remanent magnetic properties of single-domain grains under uniaxial compression are easily interpreted by a graphical method based on the Néel thermal fluctuation theory, provided the stress σ and the magnetic field H are parallel. The change in remanence resulting from a change in magnetic field, stress, or tempe…
Cylindrical single crystals of nickel were prepared and their thermal expansion and Young’s modulus were measured over the temperature range of 0°∼500°C by a dilatometer and by means of an electrostatic type vibrator-controlled oscillator system, respectively. Then, from the measured values, the elastic parameters Sij…
The relative energies of the d-orbitals in tetragonal copper(II) complexes with ammonia and ethylenediamine are discussed in terms of a simple empirical theory. The d-orbital splitting is considered to arise from both σ-antibonding and electrostatic effects. The former is calculated from angular overlap considerations…
Abstract Sarverogenin is most probably a 3β, 11β, 14β‐trihydroxy‐7, 8β‐epoxy‐12‐oxo‐5β‐card‐(20:22)‐enolide ( 3 ). This follows from IR., NMR., and mass spectra together with former chemical results.
Titanium alloys stress corrosion cracking /SCC/ from metallurgical-mechanical viewpoint, discussing phase transformations, dislocation arrangements, crack propagation, etc
Abstract
A new choice of unit layer proposed by Sadanaga & Takeda (1968) has been found useful for explaining the two characteristic features of the X-ray diffraction pattern of the mica, namely, the periodic intensity distribution and the partial enhancement of symmetry. The recognition of the fact that the symmetry of the ne…