A. G. Malikov
Russian Academy of Sciences
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Featured researches published by A. G. Malikov.
Journal of Applied Mechanics and Technical Physics | 2015
V. M. Fomin; A. A. Golyshev; A. G. Malikov; A. M. Orishich; V. B. Shulyat’ev
The quality of cutting of low-carbon and stainless steel by beams of fiber and CO2 lasers with oxygen or nitrogen being used as a process gas is compared. The cut surface roughness for sheets from 3 to 10 mm thick is determined. Domains of optimal (in terms of the minimum roughness criterion) application of lasers of various types in the space of dimensionless parameters (Peclet number and dimensionless power) are found. It is demonstrated that the CO2 laser is more effective for laser-oxygen cutting, while the fiber laser is more beneficial for cutting with the use of a neutral gas.
Journal of Applied Mechanics and Technical Physics | 2015
B. D. Annin; V. M. Fomin; E. V. Karpov; A. G. Malikov; A. M. Orishich; A. N. Cherepanov
Results of an experimental study of properties of joints obtained by using different regimes of laser welding of the 1424 alloy (Al–Mg–Li) are reported. The strength and structure of the welded joints are determined. The influence of various types of welded joint straining on its strength is studied. It is demonstrated that the joint strength increases in the case of plastic straining.
Doklady Physics | 2015
B. D. Annin; V. M. Fomin; V. V. Antipov; E. N. Ioda; E. V. Karpov; A. G. Malikov; A. M. Orishich; A. N. Cherepanov
In this study, certain technological variants of the laser welding of alloy 1424 of the Al–Mg–Li–Zr system are considered with the purpose of obtaining the durability level of the welded joint, which is close to that of the basic metal. It is shown that, in the case of using various types of plastic deformation of the welded joint, its durability can be increased considerably to 0.85–0.95 from that of the basic metal.
Journal of Applied Mechanics and Technical Physics | 2018
A. M. Orishich; A. G. Malikov; Evgenij Karpov; N. A. Pavlov; I. S. Mesenzova
Laser welding of the 1420 alloy of the Al–Mg–Li system is experimentally studied for the purpose of its optimization. Various modes of heat treatment of fixed joints obtained by means of laser welding are considered. Heat treatment modes that allow significant enhancement of the welded joint density as compared to the as-received alloy are chosen. The ultimate relative elongation of samples after ageing is found to decrease by a factor of 3.
Key Engineering Materials | 2017
Anastasia Smirnova; Yury Pochivalov; Victor E. Panin; Anatoly Orishich; A. G. Malikov; Vasily M. Fomin; Anton Gorbunov
The structure and mechanical properties of welded joints of VT23 titanium alloy received by method of laser welding after modifying the surface layers by ultrasonic mechanical forging (Treatment 1 and Treatment 2) were investigated. The experimental tests have revealed that the Treatment 2 provides a multiple increase in the relaxation property in fatigue life test. The formation of nonuniform distribution of vanadium, chromium and molybdenum in the welded joint increases the strength and, at the same time, the brittleness of β-phase. Mechanical treatment of the surface layers in the second mode provides a multiple increase in ductility up to 13%, in the as-received condition up to 9.9%. In consequence of plastic deformation, the β-phase intensity reduces twice with Treatment 2 which is related to its clustering. As follows from a presented data, the fatigue life of the VT23 titanium alloy has increased more than threefold.
Journal of Applied Mechanics and Technical Physics | 2017
B. D. Annin; V. M. Fomin; Evgenij Karpov; A. G. Malikov; A. M. Orishich
Results of experimental investigations of welded joints of high-strength aluminum–lithium alloys of the Al–Cu–Li and Al–Mg–Li systems are reported. The welded joints are obtained by means of laser welding and are subjected to various types of processing for obtaining high-strength welded joints. A microstructural analysis is performed. The phase composition and mechanical properties of the welded joints before and after heat treatment are studied. It is found that combined heat treatment of the welded joint (annealing, quenching, and artificial ageing) increases the joint strength, but appreciably decreases the alloy strength outside the region thermally affected by the welding process.
Journal of Applied Mechanics and Technical Physics | 2017
V. M. Fomin; A. A. Golyshev; V. F. Kosarev; A. G. Malikov; A. M. Orishich; N. S. Ryashin; A. A. Filippov; V. S. Shikalov
A method is proposed for creating principally new functionally graded heterogeneous materials on the basis of B4C ceramic powders with different mass fractions in the original mixture and plastic metallic additive of Ni by a combined method of cold spraying with subsequent layer-by-layer laser treatment. Mechanical properties of the resultant tracks are examined. It is shown that the track microhardness increases with increasing B4C concentration in the original mixture. The track structure is found to depend on the size of ceramic particles in the interval from 3 to 75 μm. Reduction of the B4C particle size (approximately by a factor of 2–3) inside the track owing to fragmentation under the action of the laser beam is observed for the first time.
Quantum Electronics | 2009
A. G. Malikov; A. M. Orishich; Viktor B Shulyat'ev
Quantum Electronics | 2012
A. G. Malikov; A. M. Orishich; Viktor B Shulyat'ev
Quantum Electronics | 2015
A A Golyshev; A. G. Malikov; A. M. Orishich; Viktor B Shulyat'ev