Justification by electrochemical research the use in practice the granular form of cobalt chrome alloy blanks

With the help of electrochemical studies is proved higher corrosion resistance of the cobalt-chromium alloy, produced in the form of pellets, compared with the traditional form of this alloy in bars.С помощью злектрохимического исследования доказана более высокая коррозионная стойкость сплава КХС, выпускаемого в виде гранул, по сравнению с традиционными заготовками данного сплава виде прутков

Effect of KCl and CsCl on the Electrical Conductivity of Molten LiF–KBr at the Critical Composition

The electrical conductivity was measured from the melting point to 1280 K for molten 0.7 LiF–0.3 KBr (its composition corresponds to the top of the miscibility gap) containing (2.3, 4.4, 6.5, 8.8, and 11.2) mol % KCl or (1.2, 2.5, 5.5, and 10.2) mol % CsCl to establish the influence of this solute on the stability of the two-phase system. These results indicate that the temperature dependences of the conductivity along the saturation lines for all of the mixtures studied herein are similar to one another. Hence, this demonstrates that small additions of KCl and CsCl to the dissolving melt of LiF-KBr do not exert a substantial influence on its type of criticality. In the vicinity of the critical point, the temperature dependence on conductivity differences for melts is investigated and is described by the equation Δκ ≈ (<i>T</i>_c – <i>T</i>)^<i>k</i>, where <i>k</i> is the critical exponent (<i>k</i> = 0.98). The critical temperature changes as a function of the mixture composition and depends on the ion size of the salt added. The critical temperature increases continuously with the addition of CsCl to molten LiF-KBr, whereas it decreases as the fraction as KCl is added. This circumstance must occur during the organization process, as salts accumulate in the dissolving molten mixture, and they prevent the confluence of the phases at a given operating temperature. To interpret the experimental results, the charged hard sphere model for ionic melts in the Debye–Hückel approximation was used with an account of the excluded volume

Peculiarities of the Tectonomagmatic Processes in the Interaction Area between the Icelandic Plume and the Bight Transform Fault (North Atlantic)

Geological and geophysical data collected during the 53rd cruise of the R/V Akademik Sergey Vavilov are presented. It is shown that the lateral distribution of the Icelandic plume material to the south is not bounded by the Bight transform fault and continues further to the south. The Bight FZ affects the processes of crustal accretion and the formation of tectonic structures only in a spreading segment directly adjoining the Bight FZ from the south, i.e., the most distant from the Icelandic plume. The anomalous magnetic field studied made it possible to determine the half-spreading rate (11.7 mm/yr) in the westerly direction for the area between the Bight transform fault and the Modred nontransform fault of up to 3.6 Ma in age. It is shown that the flanks of the Mid-Atlantic Ridge represented a shallow-water area with some areas of land in the recent past

Geological-Geophysical Investigations in the North Atlantic during Cruise 53 of the R/V Akademik Sergey Vavilov

We provide information on geological and geophysical investigations of the structure of the area between the Bight and Charlie Gibbs transform faults in the North Atlantic during cruise 53 of the R/V Akademik Sergey Vavilov in September-October 2021. The structure of the Eastern Tula Rise is also considered. The preliminary results of the expedition are discussed

CRUSTAL ACCRETION ALONG THE NORTHERN MID ATLANTIC RIDGE (52°-57°N): PRELIMINARY RESULTS FROM EXPEDITION V53 OF R/V AKADEMIK SERGEY VAVILOV

This study investigates crustal accretion processes along the northern stretch of the Mid-Atlantic Ridge (MAR) between the Charlie Gibbs (52°-53°N) and Bight (57°N) transforms. These long-lived transform systems, active for more than 40 Ma, bound a ~ 550 km-long MAR segment influenced to the South by the Azores and to the North by the Iceland mantle plumes. The Bight transform is located at the tip of the Reykjanes Ridge, where the spreading direction, influenced by the southward propagation of the Iceland plume, changes from oblique (30° to the axis) to perpendicular to the axis. Four hundred kilometres to the south, the MAR is offset by the Charlie Gibbs transform system consisting of two long-lived right-lateral transform faults linked by a short ~ 40 km-long spreading segment. Previous expeditions surveyed large areas of these two transform systems, defining their main morphological features. Based on these bathymetric data, Expedition V53 of the R/V A.S. Vavilov carried out an intense dredging program coupled with magnetic surveys in an area spanning from 57° to 52°N, covering both the Bight and the Charlie Gibbs transform systems. We collected 1850 kg of rock samples including limestones, basalts, gabbros and mantle peridotites from 27 dredging sites, along with two 6-m long sedimentary cores. The sampled lithologies are globally in agreement with the contrasting morphological features of the two transform faults. We discuss here and compare the geology of these two major transform systems and assess the influence of the Icelandic plume on seafloor morphology at the Bight Fracture Zone