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SUPERPLASTICITY AND SOLID STATE BONDING OF TITANIUM ALLOYS

R. Ya. Lutfullin , O.A. Kaibyshev , R.V. Safiullin , O.R. Valiakhmetov and M.H. Mukhametrahimov Institute for Metals Superplasticity Problems , Russian Academy of Sciences , Ufa 450001 , Russia

金属学报(英文版)

Experimental results related to solid state weldability of superplastic titanium alloys are presented. A correlation between superplastic flow and enhanced solid state weldability was established. It has been experimentally shown that a drop in the lower superplastic flow temperature with decreasing mean grain size provides an opportunity to decrease the temperature at whicmethods for titanium alloys.

关键词: superplasticity , null , null

MATHEMATICAL SIMULATION OF HEAT AND MASS TRANSFER IN PULSED ARC WELDING BY MELTING ELECTRODE

O.I.Shpigunova , S. V. Shpigunov , Yu.N. Saraev (Institute of Strength Physics and Materials Science , Siberian Branch , Russian Academy of Sciences , Tom- sk , Russia)

金属学报(英文版)

In this paper the processes of melting and transfer of an electrode metal to the molten pool, hydrody- namics of molten pool in controlled pulsed arc welding in carbon dioxide have been investigated.The process of pulsed arc welding with systematic short - circuits of the arc gap is realized by adaptive algo- rithms of pulsed control over main energetic parameters of welding - arc current and voltage,arc heated efficiency,peak,short - circuiting current, which provide the dosage of energy for energy for melting and transfer of every for of an electrode metal, the control over fluidity of the weld pool. Physica and mathematical models describing such processes in CO2, origind software hare been developed.The re- sults of physical simulation and mathemaical modelling permit to determine the influence of energetic parameters of the process on the condition of the "power source-electrode-arc-molten pool" electrodynamic system at each moment of time.

关键词: pulse , null , null , null

Many-body Interatomic Potentials for Computer Simulation of Physical Processes in Metals and Alloys

V.M.Kuznetsov , G.E.Rudenskii , R.I.Kadyrov and P.Kaminskii (The Institute of Strength Physics and Material Science , Russian Academy of Sciences , Siberian Branch. Academicheskii av. 2/1 , 634048 Tomsk , Russia)

材料科学技术（英）

A model of binding forces in metals and alloys, based on the density functional theory and accounted effects of the many-body interactions, was proposed. The developed method can be easily applied for study of metals and alloys by the molecular dynamics simulation. The potentials of interatomic interactions have been found by the proposed method and applied for calculations of equation of state, elastic moduli and phonon dispersion in metals Ni, Al, alloys NiAl and Ni3Al. Results of the calculations are in good agreement with known experimental data both for pure metals and alloys.

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Dissipation of Solitary Waves in Aluminum with Grain Boundary

S.G.Psakhie , K.P.Zolnikov and D.Yu. Saraev (Institute of Strength Physics and Materials Science , Russian Academy of Sciences , Siberian Branch , Akademicheskii pr.2/1 , 634021 Tomsk Russia)

材料科学技术（英）

The behaviour of passing solitary waves through the region of grain boundary has been investigated on the basis of the molecular dynamics method. It has been shown that solitary waves initiated by compression and shear loading have a different interaction with the grain boundary region. The possibilities of using solitary waves for nondestructive testing of materials, in particular, for testing the quality of coatings, for testing of accumulation of microdamages, etc. have been noted.

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State-of-the-Art and Perspectives in the Field of Particulate Nanostructured Materials

R.A.Andrevski(Institute of New Chemical Problems , Russian Academy of Sciences , Chernogolovka , Moscow Region , 142432 Russia)

材料科学技术（英）

A great attention has been paid to the research and development of nanostructured materials.The main preparation methods of ultrafine particles and nanostructured materials have been summarized. The applications of zone typical nanostructured materials have also been reviewed.The peculiar characteristics and properties. such as density, grain size, hardness, superplasticity,magnetic and catalytic properties have been discussed

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Calculation of Surface Energy of Metals and Alloys by theElectron Density Functional Method

VM.Kuznetsov , R.I.Kadyrov and G.E.Rudenskii (Institute of Strength Physics and Material Science , Russian Academy of Sciences , Siberian Branch.Academicheskii av. 2/1 , 634048 Tomsk , Russia)

材料科学技术（英）

The surface energy values of (100), (110), (111) surfaces in Ni. Al and ordered alloys NiAl and Ni3Al have been calculated within the framework of methodology based upon the electron density functional method. The results of calculations are in good agreement with the known for pure metals experimental data and in case of Ni3Al allop There is also a good agreement with the results obtained by calculation using the embedded atom method. The investigation has been carried out in this work to show that the surface energy σ of alloys can not be interpreted as an averaged concentration σ of pure metals. For NiAl, the obtained resulsts reveal considerable distinctions in anisotropy of a in comparison to the anisotropy of surface energy in pure matals.

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