Materials Literature
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This paper presents a method of evaluating the embrittling effect of hydrogen on metals by measuring the pressure required to burst a small metal disk. The metal disks are clamped, and the system is pressurized until failure occurs. Embrittlement is expressed by the inverse ratio of the rupture pressures of a hydrogen…
The various known effects of the depth of penetration on needled-fabric structure and tensile properties are considered. New experiments are introduced that involve needling the same web by using needles having differing numbers of barbs. These experiments show changes in fabric tenacity related to alterations in barb…
Equilibrium partial oxygen pressure of SrFe 18O 27 ferrite phase was determined between 1250° and 1460°C by flowing CO2-O2 mixed gas or in air. In air this phase is stable in the temperature between 1400° and 1460°C. At 1350°C the partial oxygen pressure ranges from 6×10-2 to 3×10-2 atm, and at 1300°C from 4 × 10-2 to…
Passsivity of the alloy series in solutions is evaluated by means of potentiostatic polarization curves and by measurements of critical pitting potential. Passivity is observed only in alloys of >40% Ni, the actual critical Ni content depending on Cl − concentration, sulfate concentration, and p H. Pitting of Ni‐Cu al…
The electrical characteristics of metal/amorphous Si/crystalline Si (M/a Si/c Si) structures have been investigated and found to depend strongly on whether the M/aSi contact is Ohmic or blocking. Evaporated 1000-Å-thick Cu and Sb films were found to form Ohmic contacts to aSi after proper annealing. With these contact…
The crystal structure of the title compound has been determined from X-ray data measured on a four-circle diffractometer. The crystals are monoclinic, space group P21/c, with a= 13·938, b= 12·882, c= 20·220 Å, β= 112·87°, Z= 4. 3459 Reflections were measured of which 2492 exceeded 2·5σ, and were used in the analysis.…
Studies have demonstrated versatility of PMR approach for tailor making polyimide matrix resins with side range of flow characteristics. By simply adjusting molar ratio of reactants in monomer mixture, resins having flow values of as much as 20% can be achieved.
A trial has been made to formulate the surface tension of pure liquid metals by use of basic physical quantities from a practical standpoint. The effective interatomic potential was given in a simple form as a function of the melting point and atomic volume by use of Lindemann’s formula under the assumption which cons…
Wettability, as indic.atedby contact angle with water, of phellogen and old phloem surfaces of loblolly pint: (Pinus taeda) rhytidome was determined after extraction, heating, and aging.These two tissnes are the predorilinant surfaces exposed after riiilling pine bark into srnall particles.Contact angles rileas~ired f…
The growth of tantalum carbide fiber by an a‐c discharge method was studied. Maximum growth rates of up to 40 mm/min were obtained under the, following conditions: the discharge current (60 Hz) was 0.4–0.6 mA; the concentrations of hydrogen, argon, tantalum pentachloride, and propylene were 4.9, 94.4, 0.2, and 0.5%, r…
An empirical relation between the lattice constant and the magnetic moment was found in binary solid solutions of 3d transition metals expressed as a(x)=aA(1-x)+ aB x + C <|µ|>, where x is the atomic fraction, aA, aB and C are parameters, <|µ|> the average magnitude of atomic magnetic momen…
Fragilaria oceanica the dominant component in a mixed bloom of diatoms and a blue green alga which occurred near Mangalore in August 1972 showed a density of 36.8 x 106 cells/l and constituted 92% of the total number of cells in the bloom. The components of the bloom were Rhizosolenia sp. Pleurosigma sp. Coscinodiscus…
Abstract not Available.
Abstract A method which allows the rapid and accurate determination of specific surface area for materials from a single point on the nitrogen adsorption isotherm is described. The calculation is made from a single adsorption point which can lie almost anywhere on the isotherm. The method does not suffer from the theo…
We have succeeded in growing single crystals of MnBi which are essentially free of excess bismuth. We report here on magnetization measurements on such single crystals from 4.2 K to 635 K in magnetic fields up to 21 kOe using a vibrating sample magnetometer. The magnetization at 4.2 K is 3.84±0.03 μB/Mn atom and is pe…
Under the experimental conditions employed, and especially for highangle grain boundaries, the penetration distance, the diffusion coefficient and the activation energy for the diffusion of zinc along tilt boundaries in aluminum strongly depend on the misorientation. For a given boundary, the previously mentioned quan…
We have shown that it is possible to grow a uniform Ta oxide film up to a thickness of 1500Å by plasma oxidation. The average speed of growth was 0.1 Å/sec, which is comparable to earlier studies. Our experiments show that there is no significant contamination of the oxide due to sputtering from the cathode and that t…
Measurements have been carried out of the parallel and perpendicular magnetostriction of a polycrystalline equi-atomic FeRh alloy. Measurements were made in pulsed magnetic fields up to 15 T in the antiferromagnetic phase and at the antiferro-ferromagnetic transition induced by the field. The perpendicular antiferroma…
With new techniques of crystal growth new problems have been encountered with the platinum apparatus used in crystal production. Some of these difficulties are discussed in this paper, including attack by bismuth oxide, Bi 2 O 3 , and dissolution of the platinum in the leaching acids, together with methods of prolongi…
The use of hydrogen as a rocket fuel has been successfully established; however, it has also been established that many metals are degraded in one or more of their properties by environmental gaseous hydrogen. The degree of degradation may range from slight to extreme, depending on the metal being analyzed and the typ…