Adsorption of Ni(II), Cu(II), and Zn(II) ions by natural alumosilicate modified with <Emphasis Type="Italic">N</Emphasis>,<Emphasis Type="Italic">N</Emphasis>'-<Emphasis Type="Italic">bis</Emphasis>(3-triethoxysilylpropyl)thiocarbamide

Immobilization of N,N'-bis(3-triethoxysilylpropyl)thiocarbamide on the surface of natural alumosilicates from Eastern Transbaikal has been carried out. Adsorption isotherms of Ni(II), Cu(II), and Zn(II) ions on modified adsorbents have been plotted. The experimental data have been treated using the Langmuir, Freundlich, BET, and Dubinin–Radushkevich models. The constants of these equations have been determined. It has been shown that adsorption on alumosilicates modified with N,N'-bis(3-triethoxysilylpropyl)thiocarbamide is described in the best way by the Freundlich and Langmuir adsorption models. The Dubinin–Radushkevich model has been employed for the calculation of free energy of adsorption. For all the specimens under study, the free energy of adsorption indicates the presence of an ion-exchange mechanism, while the adsorption of heavy-metal ions has a chemical nature.     

Hard and Corrosion-Resistant Ni-<Emphasis Type="Italic">x</Emphasis>Al-<Emphasis Type="Italic">y</Emphasis>Ti Nanocomposite Coatings for CNT/Al Composites

The ternary Ni-xAl-yTi (x, y in wt.%) nanocomposite protective coatings were electroplated on carbon nanotubes (CNT)/Al composite by the co-deposition of Al and Ti particles at several current densities. The dependences of microstructure, microhardness, residual stress, and corrosion resistance of the ternary nanocomposite coating on current density were investigated. The results showed that the embedded Al and Ti particles caused the crystallite refinement and the decrease of [200] fiber texture of nanocrystalline Ni matrix when current density decreased. The microstructure evolution endowed the ternary nanocomposite coating with high microhardness and corrosion resistance. The surface residual stress of the ternary nanocomposite coating increased with decreasing current density.     

X-ray diffraction determination of root-mean-square displacements of atoms in <Emphasis Type="Italic">B</Emphasis>2 and <Emphasis Type="Italic">R</Emphasis> phases of titanium nickelide

Intensities of 15 fundamental and 11 superlattice reflections of the B2 phase have been measured in a titanium nickelide single crystal using X-ray Mo Kα radiation. Structure factors for these reflections and root-mean-square displacements of nickel and titanium atoms from the crystal-lattice sites have been calculated. The mean squared displacements of nickel atoms are equal to 〈u ²〉_Ni=0.087 ± 0.006 Ų; those of titanium atoms, 〈u ²〉_Ti = 0.039 ± 0.003 Ų. The temperature dependence of root-mean-square displacements in the B2 phase and in the temperature range of the B2 → R transformation has been determined. Root-mean-square atomic displacements in the R phase have been calculated. The Debye temperature has been determined and the root-mean-square atomic displacements in the B2 phase have been separated into static and dynamic ones.     

<Emphasis Type="Italic">Recent Developments in</Emphasis> zinc blast-furnace technology

Improved zinc blast-furnace techniques—including the development of updraft sulfide sintering and utilization of charges containing up to 25% Pb—are reported. The installation and operational results of a new, large-furnace installation at Swansea, Wales, are described. Details of a vacuum method for improving the purity of the zinc—with lead impurities indicated to be as low as 0.4%—are included.     

<Emphasis Type="Italic">Development of</Emphasis> an iron-base beryllium-strengthened alloy

The possibilities of beryllium-strengthened iron-base alloys have been pursued to achieve a commercial low-density, high-strength alloy for service to 1400°F.     

<Emphasis Type="Italic">An evaluation of</Emphasis> disposable hot tops

The development of disposable hot tops has enabled a major steel producer to satisfy customer demands for wide killed-steel strip without having to resort to uneconomical practices.     

Electrochemical characteristics of amorphous MgTixNi （x = 0,0.1, and 0.2） hydrogen storage alloys

MgTi _x Ni (x = 0, 0.1, and 0.2) alloys were successfully prepared by mechanical alloying (MA), and the influence of milling time on the electrochemical characteristics of the electrodes was discussed. MgTi _x Ni alloys after 90 h milling displayed the best electrochemical performance. The X-ray diffraction patterns showed that the alloy ball-milled for 90 h was amorphous with a widened diffraction peak. The charge-discharge tests indicated that these alloys had good electrochemical activation properties, and the MgTi_0.2Ni alloy electrode exhibited the best cycle performance. The initial discharge capacity of the MgTi_0.2Ni alloy reached up to 401.1 mAh·g⁻¹, and the retention rate of capacity was 31.0% after 30 cycles, much higher than that of MgNi (17.3%). The Tafel polarization curves revealed that Ti addition could enhance the anticorrosion performance of these alloys in alkali solution, which was responsible for the ameliorated cyclic stability of these alloy electrodes.     

<Emphasis Type="Italic">An evaluation of</Emphasis> maraging steel sheet

Results of investigations into the metallurgical and mechanical behavior of 18Ni-9Co-5Mo maraging steel—one of a series of tough, high-strength alloys in a period of rapid development.     

Levitation melting …… <Emphasis Type="Italic">A Survey of the State-of-the-Art</Emphasis>

The unique advantages of levitation melting have led to its steady development as a laboratory tool, and promise even wider application to a variety of metallurgical and physicochemical studies in the future.     

Influence of the Size and Structural Factors on the Magnetism of Multilayer Films Based on 3<Emphasis Type="Italic">d</Emphasis> and 4<Emphasis Type="Italic">f</Emphasis> Metals

This work has presented some data on the layer structuring of films of 3d and 4f metals and their alloys, which have potential for practical use in magnetic sensors. The decrease in the thickness of magnetic layers with this structuring entails natural worsening of the crystallinity and leads to a degradation of magnetic ordering. However, the manifestation of these tendencies depends to a great extent on the conditions of preparation, the composition, and the sequence of the deposition of the contacting layers in the multilayer structures. The combination of these factors makes it possible to realize an optimum composition and optimum structural states of the films, which in a number of cases lead to the appearance of new combinations of functional properties.     

Mechanism of infiltration <Emphasis Type="Italic">of porous powder-metallurgy parts</Emphasis>

This article discusses the history, mechanism, and theory of infiltrating porous powder-metallurgy parts with molten metal.