Formation of the structure and properties of Cu-Pd alloys during the <Emphasis Type="Italic">A</Emphasis>1-<Emphasis Type="Italic">B</Emphasis>2 phase transformations

The formation of the structure and properties of Cu-Pd alloys during the Al-B2 phase transformations is discussed. The evolution of the microstructure is analyzed, and the temperature dependences of the electrical resistivity, thermopower, and linear thermal expansion coefficient of Cu-Pd alloys in various initial states are studied. The order-disorder-order phase transformations in this system are found to occur in several stages. The possible causes of the discrepancies between the reported data are analyzed.     

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.     

Effect of chloride ions on electrochemical properties of anodized <Emphasis Type="Italic">AV</Emphasis> and <Emphasis Type="Italic">D</Emphasis>16 aluminum alloys in aqueous and glycerin-containing aqueous sodium sulfate solutions

The effect of chloride ions (0.01 N NaCl) on the electrochemical properties of anodized (in chromic anhydride or sulfuric acid) AV and D16 aluminum alloys in aqueous sulfate (0.5% Na₂SO₄) and glycerin-containing aqueous sulfate (0.5% Na₂SO₄, 33% glycerin) solutions is studied. Depending on the conditions of anodizing and the composition of the alloy and environment, currents on the anodized alloys in the passive range are shown to be smaller by one to four orders of magnitude compared to those on nonanodized alloys. Anodizing increases the resistance of alloys against pitting corrosion. Alloys anodized in sulfuric acid and then treated in dichromate are not susceptible to pitting corrosion. Alloys anodized in chromic anhydride are less resistant against pitting.     

Effect of anisotropy in <Emphasis Type="Italic">XXZ</Emphasis> Heisenberg chain on entanglement properties

We study the entanglement of Heisenberg XXZ spin chain using the exact diagonalization method. Increasing parameter of anisotropy makes it possible to increase concurrence, although its maximum value is reached at a nonzero external field. A linear relation between the maximum value of the magnetic field allowing entanglement and the parameter of anisotropy has been established.     

<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">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.     

<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> 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.     

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.     

Phases and processes: <Emphasis Type="Italic">Current research on tungsten</Emphasis>

Although at this time relatively little property data are available on tungsten-base alloys, it is apparent from the extent of current research activities that within a year or two we can look forward to having a much better idea of the real potential of tungsten-base alloys for high temperature applications.     

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.