Materials Literature
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A Type 348 stainless steel in-pile tube irradiated to a fluence of 3 × 1022 neutrons/cm2 (E > 1 MeV), 57 displacements per atom, was destructively examined. The service had resulted in a maximum total creep of 1.8 percent at the high fluence. The metal temperature ranged between 623 and 652 K, hence the thermal…
Four grades of high strength maraging steel were tested in air and aqueous solutions for susceptibility to stress corrosion cracking and hydrogen embrittlement. Electrochemical methods were used to characterize each alloy and to control the test conditions during slow strain rate tensile tests. Environment sensitive f…
We have studied the 19F NMR of the TlSn2F5 compound at various temperatures and frequencies. While the measured T1 shows a classical behaviour for T < 358 K, as is generally observed in ionic conductors, it undergoes a sudden increase at T ∼ 358 K corresponding to a change in the crystallographic space group. For high…
Conference International Conference on Surface and Colloid Science, International Conference on Surface and Colloid Science, ICSCS, Surface and Colloid Science, Fourth, Jerusalem, Israel, 1981-07-05–1981-07-10 Published Online: 2009-01-01 Published in Print: 1981-01-01 © 2013 Walter de Gruyter GmbH, Berlin/Boston
Effects of certain solute elements on the recrystallization temperature of copper have been studied by X-ray, micro-hardness and electrical resistivity measurements. Specimens of copper alloys containing solute elements of 0.01–0.3 at% were melted and cast in vacuo, and cold rolled to 90% reduction. The recrystallizat…
Two types of twins are frequently found in naturally and experimentally deformed kyanite. Structural models based on periodic shears are proposed to account for these mechanical twins. The structure of kyanite is then regarded as layered, the limits of each layer being easy glide planes for dislocations. The shear pla…
Thermodynamic activity measurements of the components in the CaTiO3-Ti2O3-TiO2 ternary system were performed by differential mass spectrometry at about 2150 K. Observed pressures for gaseous species Ca, TiO and TiO2 were used to calculate Ti, TiO, Ti2O3, TiO2 and CaTiO3 activities in the studied liquid mixtures. These…
Abstract On the basis of the investigation of the influence of Ca concentration on yield point at different strain rates it is revealed the nature of the obstacles for dislocations overcomed with and without thermal activation.
Elastic after-effects in Wsingle crystals with various orientations were measured below 50 K after fast neutron irradiation at about 5 K. Two prominent relaxation peaks were observed at 5.5 K and 17.6 K (relaxation time of about 2 min). These two peaks correspond, respectively, with the 8 K and 27 K internal friction…
The HeI photoelectron and ultraviolet absorption spectra of the oximes and O-methyloximes of a series of conjugated Schiff bases have been determined. The importance of the low ionization potentials of these compounds is stressed, especially in connection with the chromophore of visual pigments. The location of the (π…
Coupon specimens of 20Cr-25Ni-Nb-stabilized stainless steel have been annealed at 1273 K in dynamic vacuum for periods of from 1 to 1000 h. It is shown that manganese and chromium both evaporate readily over this period with kinetics which are consistent with the rate of loss from the surface being proportional to the…
Preliminary studies have been carried out on charging characteristics of two epoxy powders and a polytetrafluoroethylene (PTFE) by measuring charge-to-mass ratios (Q/m). The epoxy powders were charged by corona current and the PTFE by triboelectric. The results indicate that for the PTFE powder, the mean Q/m is invers…
The upper part of the Montesano Formation near Aberdeen, Washington, contains early late Miocene marine diatoms of Schrader’s North Pacific Diatom Zones XIII and XIV and Subzone b of combined Zones XV–XVI as modified by Barron. Silicoflagellates are referable to Bukry’s Distephanus pseudofibulaZone and support the dia…
The correlation between the phase change and the appearance of ferromagnetism in Ni75−xMnxSn25 alloy was studied. There appeared three kinds of phases with the DO19-type hexagonal, the DO3- and the Heusler (L21)-type cubic structures in this alloy. In each phase, the ferromagnetic Curie temperature, Tc, had a tendency…
The modification B-Nb2O5, theoretically the stable polymorph below ca. 940 K, undergoes no transformation to the high-temperature stable H-Nb2O5 under oxidising conditions, below ca. 1 220 K. Reducing conditions facilitate the transformation. At or below 1 020 K, B-Nb2O5 is reduced directly to NbO2, without traversing…
The thermal decomposition and the glass transition temperature of poly p-methoxystyrene (PpOMeS) were studied with a (DSC-2) differential scanning calorimeter. The undecomposed and decomposed polymers were analyzed by gel permeation chromatography for molecular weight distributions and by DSC-2 for changes in the poly…
Uranium-plutonium mixed monocarbide pellets, which had densities over 90% T.D. and near-stoichiometric compositions, were fabricated in the gloveboxes of the atmosphere of purified Ar. The carbide powder was first synthesized by reducing mechanically blended oxides with graphite at 1,510°C in a vacuum of 0.2 Pa. This…
Kinichilite, a new mineral from the Kawazu mine, is hexagonal with a=9.419 Å, c=7.666 Å, space group P63 or P63⁄m. The empirical formula derived from the chemical analysis is: (Fe2+1.13Mg0.47Zn0.43Mn2+0.17)Σ2.20(Te2.97Se0.03)Σ3.00 O9.00(H1.38Na0.22)Σ1.60·3.2H2O, corresponding to Fe2+ dominant analogue of zemannite.It…
An artificial crevice has been developed which enables the measurement of the pH and potential to be made at three locations in the crevice. Experiments have been conducted using the steel BS 4360 50D in 3·5% NaCl and in artificial sea water. The crevice specimen was coupled to a steel section of much larger area loca…
Abstract The effect of the partial pressure of gaseous ammonia on differential thermal analysis and thermogravimetric curves of ammonium nitrate has been determined. Observed variations of the thermal effect and decomposition rate constitute a basis for considering the factors which determine the decomposition and equ…