Evolution of the Structural-Phase State of a Titanium Alloy of the System Ti–Al–V–Mo During Formation of an Ultrafine-Grained Structure Using Reversible Hydrogenaтion

Russian Physics Journal - Using methods of electron-microscopy and x-ray structural analysis, we have investigated peculiarities of the evolution of the structural-phase state of an alloy of the...     

Development of Superplastic Deformation in Ultrafine-Grained α–β-Titanium Alloys with a Large Content of β-Phase

Russian Physics Journal - The features of the development of superplastic deformation and the evolution of structural-phase states of ultrafine-grained VT22 and VT35 alloys under tension in the...     

Investigation of grain-boundary diffusion of nickel in molybdenum by auger electron spectroscopy

The dependence of the grain-boundary diffusion coefficient of nickel in molybdenum on annealing temperature was investigated. Possible causes are analyzed for differences in the values of the grain-boundary diffusion coefficients and the activation energies for this process from those obtained by earlier researchers.Institute of the Physics of Strength and Materials Science, Siberian Branch, Russian Academy of Sciences (SO RAN). Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 28–31, July, 1992.     

High-temperature creep of nickel under conditions of grain-boundary diffusion of impurities from the surface

Comparative investigations of the effect of diffusion streams of copper atoms (a weakly segregating impurity) and silver atoms (a strongly segregating impurity) from the surface in the high-temperature plastic deformation of nickel have been carried out. It has been established that in the high-temperature plastic deformation of nickel, when there are diffusion streams of copper and silver from the surface, there is a reduction in the creep resistance of nickel due to an increase in the contribution of grain-boundary slip to the overall deformation. Two stages, characterized by different values of the rate sensitivity factor m, are observed on the curve of the stress against the rate of deformation over a certain temperature range for each impurity. In the region of deformation rates of sec⁻¹, m≊0.2, and for sec⁻¹, m becomes less than 0.05. Institute of Physics of the Strength and Study of Materials. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 119–125, July, 1997.     

Variation of apparent creep activation energy in plastic deformation of molybdenum in diffusion contact with nickel

The variation of the apparent creep activation energy as a function of the state of grain boundaries is investigated in the deformation of molybdenum in the presence of diffusion fluxes of nickel at the grain boundaries. It is shown that this energy varies in the same way as in the plastic deformation of classical superplastic materials.Physics Institute of Strength and Materials Science, Siberian Branch, Russian Academy of Sciences. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 110–113, May, 1993.     

Peculiar effects of plastic deformation by cold rolling on structure and mechanical properties of submicrocrystalline and titanium alloys

Using titanium VT1-0 and VT6 alloys as an example, peculiarities of the effect of plastic deformation by rolling at room temperature on the structure and mechanical properties of metallic materials in submicrocrytalline states are investigated. It is shown that this treatment can result in both hardening and softening of these alloys. It is established that variations in the behavior of their mechanical properties is controlled by the relation between structure parameters such as grain size, uniformity of their size distribution, and volume fraction of fine grains in the course of dicreasing dislocation density.