[en] On the basis of the theory of topochemical reactions considered the kinetics of joint formation in solid state. It is supposed that strong joint is being formed by the initiation and further growth of interaction centers called by the author ''centers strong bond''. Kinetic equation of strenght is obtained regarding the possible collisions of growing centres. In the majority of cases the kinetics of the process can not be described by the equation of chemical reactions of the first order; the process can contain several stages. Kinetics of the strenght growth of homogeneous (copper-copper) and heterogeneous (copper-nickel, OT4-BT15 alloys, molybdenum-yttrium-molybdenum) of welded joints at pressure welding is illustrated

[en] Formation peculiarities tee and butt joints of VT20 titanium alloy have been studied while welding in solid state. It is shown that welding defects may be eliminated by subsequent partial melting of the joints by an arc. Moreover, the heat effect of the arc in this process improves the entire quality of the joints. As a resuit, the static strength of tee joints increases from 30 to 75 kg/mm² and that of butt joints - from 30 to 42 kg/mm²

[en] Data are reviewed on the system with titanium or its alloys matrix reinforced by fibres of boron, silicon, carbide, borsic, alumina; by wires of beryllium, molibdenum, tungsten and their alloys; and by whiskers. Preparation of these composites is discussed. Mechanical properties of the materials are compared and their basic advantages and drawbacks are indicated. Compatibility of the matrix materials with the reinforcing fibres during the preparation process and under working conditions is estimated. Prospects of fibrous titanium composites creation are shown

[en] The effect of cohesive strength between filaments and matrix on the structure, strength and fracture mode during tensile and interlayer shearing tests of the aluminium-boron composite material is investigated. Cohesive strength was changed by thermocycling. The increase in the number of cycles leads to weakening the cohesion between components, which results in a change in the material fracture mode, making it increasingly cumulative and approaching, respectively, destruction through a bundle model. The hypothetic diagram of tensile strength dependence upon the cohesive strength between components is given

[en] Thermomechanical processing of the VT-6 titanium alloy using the effect of superplasticity is investigated. Rolling of the VT-6 alloy was carried out with 10-15% reduction per passage at 880-1000 deg C. After rolling all the samples were hardened and aged. Polynomial models of the second order are simulated by means of the LINRA program (linear regression analysis) for determination of optimum rolling regimes of the VT-6 alloy to obtain some service properties of material at room temperature. It is shown that the optimum regimes of rolling of the VT-6 titanium alloy from the view point of attaining maximum strength and ductility are as follows: rolling temperature 960+-10 deg C; degree of deformation 40+-5% per passage, deformation rate < 1 s^-1

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[en] A simple single-particle model of anharmonic crystal, is suggested which describes satisfactorily thermodynamic characteristics of metals in the range of high temperatures: thermal capacity linear extension, compressibility and Debye temperature. The pressure account in the model permits to evaluate thermodynamic properties of clusters. A good agreement of experimental and calculated data on thermodynamic properties for Mo and W in particular is shown

[en] Properties and microstructure of composite material 36NKhTYu+12Kh18N10T are studied, and heat treatment conditions are chosen. It is shown that process of precipitation hardening runs more intensively in the 36NKhTYu alloy after explosion welding than in initial state

No abstract available