Radik Mulyukov

Radik Mulyukov
Institute for Metals Superplasticity Problems of Russian Academy of Sciences | IMSPRAS · 04 Bulk Nanomaterials and Nanotechnology

Professor

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199
Publications
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Publications

Publications (199)
Article
The Heusler alloys demonstrate magnetically induced strain and magnetocaloric properties, but the mechanical properties are poor. Therefore, in this work, the influence of thermomechanical treatment on the properties of Ni-Mn-Ga-Si Heusler alloys is considered. The effect of multi-axial isothermal forging on functional properties of the Ni2.30Mn0.7...
Article
Full-text available
Multilayered bulk Al–Cu–Al metal-matrix composite was fabricated by means of high-pressure torsion and subsequent annealing. The resulting composite had a heterogeneous structure consisting of ductile aluminum matrix and hard intermetallic inclusions with a gradient decrease in grain size and layer thickness when moving from the center to the perip...
Article
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A hybrid composite material fabricated from the Al-Nb system using high-pressure torsion (HPT) up to 30 turns has been studied in the present work. To fabricate the composite, deformation of a three-layer Al-Nb-Al package was carried out at room temperature on Bridgman anvils with grooves under a pressure of 5 GPa at N=10, 25 and 30 revolutions, at...
Article
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Abstract. Among different approaches for obtaining composite structures, one can distinguish the approach of severe plastic deformation that allows obtaining bulk structures from strongly dissimilar metals. The application of large strains is usually associated with grain refinement and, in some cases, with the formation of intermetallic phases, bo...
Article
The main point of successful manufacture of metallic composites by direct bonding of dissimilar materials is achieving a homogeneous interface bonding. Two different types of deformation techniques for fabrication of metal composites were investigated. The first one was developed on the basis of high pressure torsion associated with a high energy i...
Article
A hybrid composite material fabricated from the Al – Nb system using severe plastic deformation by high-pressure torsion (HPT) up to 30 turns has been studied in the present work. To fabricate the composite, deformation of a three-layer Al – Nb – Al package was carried out at room temperature on Bridgman anvils with grooves under a pressure of 5 GP...
Article
Full-text available
The main approach of mechanical consolidation of dissimilar metals consists in solid state joining of thin discs or powders by means of pressure‐assisted shear deformation. Prior to this research, most strongly dissimilar systems, such as Al–W and Al–Ti, were only bonded by means of mechanical alloying and subsequent powder compaction. Herein, pion...
Article
Full-text available
Multilayered Al-Cu composites were fabricated successfully by constrained high-pressure torsion (HPT) in a Bridgeman anvil type unit under an applied pressure of 6.0 GPa after ten turns. Due to the good strain compatibility of Al and Cu, achieved during HPT, separate discs bonded without pores and cracks. Microstructural characterization of the pro...
Article
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Field electron emission from a copper based composite reinforced with carbon nanotubes (Cu-4 wt.% CNT) was studied. The composite samples were processed by mixing copper powders and carbon nanotubes (CNTs) in a ball mill followed by hot isostatic pressing. To obtain a more even distribution of CNTs, the samples were subjected to high pressure torsi...
Article
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Selective laser sintering was applied for stainless steel samples additive manufacturing. It was found that in the as fabricated state, the samples consist of martensite and residual austenite, contained significant dislocation density and residual stresses. Additively manufactured samples had an ultrafine-grained structure with predominantly high...
Article
Full-text available
Results are presented from studying the structure and mechanical properties of an Al–Cu–Al metal-matrix composite obtained via shear under pressure on Bridgman anvils with grooves. The tensile strength is 485 MPa, considerably higher than that of either pure aluminum or copper. The main mechanism of failure is a viscous fracture along the Al matrix...
Article
Constrained high pressure torsion and subsequent annealing was used to fabricate Al-Cu-Al metal-matrix multilayered composite. The composite has a heterogeneous structure consisting of a plastic aluminum matrix and hard intermetallic inclusions with a gradient decrease of layer thickness from the center to periphery of the sample. Intermetallic gro...
Article
Graphane is a fully hydrogenated graphene which is practically interesting for application in electronics, hydrogen storage and transportation, in nanoscale devices. As it was previously shown, the energy of a discrete breather (nonlinear localized mode) in graphane close to the value of the energy barrier at which the dehydrogenation of graphene o...
Conference Paper
Full-text available
The paper presents first results of obtaining metal-matrix composites based on severe plastic deformation by shear under pressure of layered Al and Cu components. Three-layer composites with different alternation of layers, i.e. Al-Cu-Al and Cu-Al-Cu, were processed by constrained high pressure torsion to produce monolithic disk-shaped samples with...
Book
his book combines the perspectives of materials science of Superplasticity, on the one hand, and those of design and mechanics, on the other, in order to provide a holistic view of materials, design, mechanics and performance which will lead to useful solutions of societal benefits, in addition to providing great intellectual challenges. After cons...
Article
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A short review on the results of research and development on superplasticity of alloys and related processes such as grain refinement, solid state bonding carried out at the Institute for Metals Superplasticity of the Russian Academy of Sciences (IMSP RAS) is given. One of the most important contributions of IMSP RAS to the fundamentals of superpla...
Article
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The influence of deformation nanostructuring and subsequent annealing on the temperature dependence of the thermal expansion coefficient of the Fe-36% Ni Invar alloy is studied. The nanostructured state was obtained by severe plastic deformation via high pressure torsion in Bridgman anvils. An "anomalous" contraction of the nanostructured Fe-36% Ni...
Article
Full-text available
Selective laser sintering was used for additive manufacturing of stainless steel parts. The microstructure of the initial powder and the as-processed part was investigated. It was found that high temperature gradients involved in selective laser sintering evolve non-equilibrium microstructures in the as fabricated state, e.g. retained austenite in...
Article
Full-text available
The effect of nanostructuring on the ion sputtering rate of metals and the glow discharge current is studied. Nanostructured samples were processed by severe plastic deformation using high pressure torsion. For comparative measurements, coarse-grained samples were obtained by annealing of nanostructured samples. The sputtering rates of nanostructur...
Article
Full-text available
This paper presents the data from the study on the effect of annealing of Al-Cu metal-matrix composites, produced by severe plastic deformation via shear under pressure. Three-layer compositions with different alternations of layers (Al-Cu-Al and Cu-Al-Cu) were subjected to deformation by high-pressure torsion, and then annealed at a temperature of...
Article
Full-text available
The manuscript considers the effect of diffusion bonding pressure, as well as holding at different temperatures, on the strength of the joints between titanium alloy and stainless steel, formed by diffusion bonding through ultrafine-grained interlayers of Ni and the Ni-2%Cr alloy. In samples with an interlayer of nickel after holding at 25 °C, the...
Article
Full-text available
The work presents the comparative analysis of the microstructure and character of martensitic transformation in Heusler Ni-Mn-Ga alloys subjected to plastic deformation by forging and complex treatment by forging with subsequent extrusion. It is shown that the treatment by forging leads to the formation of a bimodal structure with large grains of s...
Article
The method utilizing high-pressure torsion (HPT) processing followed by annealing to fabricate Cu-Al in situ composite with enhanced mechanical properties is presented. The initial sample consists of three metal discs Cu/Al/Cu was processed by HPT (5 GPa, 5 turns). The analyses of the microstructure after HPT carried out by transmission electron mi...
Article
Full-text available
Aim: Chemokine stromal cell derived factor-1 (SDF-1) plays an important role in many processes such as apoptosis, proliferation, migration and angiogenesis, and these effects are mediated mostly by the receptor CXCR4. The aim of this study was to determine the expression of SDF-1 and CXCR4 in the ventricles of rats with monocrotaline-induced pulmon...
Article
Full-text available
Aim: Nitric oxide signalling pathway showed to be one of the crucial factors in the treatment and pathogenesis of pulmonary arterial hypertension. The aim of this study was to determine the effect of administration of inorganic nitrate, NaNO 3 , on the expression of caveolin-1 and its phosphorylated isoform (pTyr14Cav-1) in lungs in the experimenta...
Article
Full-text available
The formation of a sharp crystallographic texture in a Ni–Mn–Ga Heusler alloy by the multiple isothermal forging has been studied. An analysis of the thermal expansion near the martensitic transformation temperatures in the as-cast and forged states of the alloy shows that the thermomechanical treatment leads to an increase in the anisotropy of the...
Article
The application of the method of molecular dynamics based on the use of pair interatomic potentials has been discussed to study various deformation processes during structural and phase (martensitic) transformations in metallic single and polycrystals. It has been shown that the method of molecular dynamics in a two-dimensional model makes it possi...
Article
The mechanical properties and the fracture of the joints between a PT3V titanium alloy and 12Cr18Ni10T stainless steel formed by diffusion welding through ultrafine-grained layers of nickel and a Cr2Ni98 alloy are studied. The highest strength of the joint (about 390 MPa) is achieved upon welding at T = 700°C, 20 min irrespective of the interlayer...
Article
Changes of properties and the second phase particles’ distribution in diluted CuCrZr alloy in the course of equal channel angular pressing (ECAP) and post-deformation annealing are investigated. To decrease the concentration of alloying elements dissolved in the copper matrix, samples of the alloy were thermally aged prior to the ECAP. Temperature...
Chapter
Environmental superplasticity is demonstrated in polycrystalline materials that experience an anisotropic dimensional change in specific environment conditions [1].
Chapter
Like conventional alloys, usually brittle intermetallic alloys (TiAl, Ti3Al, Ni3Al etc.) in a fine-grained condition under a certain temperature-strain rate intervals display superplastic behavior [994–1003]. Phenomenological features like high elongation, low flow stress, high strain-rate sensitivity index and deformation mechanisms were found to...
Chapter
Structural superplasticity in relatively higher melting temperature materials such as Titanium alloys, Steels and Ni based alloys is discussed in this chapter.
Chapter
Scientific investigations on Superplasticity started with the works of Bengough [494], the scientists at the old Kaiser Wilhelm Institute in Berlin and Pearson [28], all from the early years of the twentieth century.
Chapter
Theories of superplasticity are reviewed in this chapter in the following order. (a) Theories of structural superplasticity, (b) Theories of environmental/transformation superplasticity. The theories proposed from the former Soviet Union during 1945–1962 are often referred to as the early theories and those propounded since the mid-1960s are known...
Chapter
The “superplasticity-like” behavior of geological materials, i.e. minerals, combinations of minerals, spinels, rocks etc., polycrystalline ice, amorphous materials (bulk metallic glasses) and some exotic materials like hydroxyapatite and CNT is discussed in this chapter.
Chapter
A majority of superplastic alloys require suitable thermo-mechanical processing to develop a microstructure conducive to superplastic deformation [11,13,14]. Several processing routes, including severe plastic deformation techniques, result in ultrafine grained (UFG) and nano-structured (NS) materials. Friction-stir processing (FSP) is one of the w...
Article
The results of investigation of the microstructure of two polycrystalline Ni-Mn-Ga alloys subjected to thermo-mechanical treatment by multiple isothermal forging and extrusion are presented. Alloy forging at a temperature of 680°C and 700°C leads to the formation of a bimodal structure which has large grains of several hundred micrometers surrounde...
Article
The temperatures ductility of the polycrystalline Ni2.19Fe0.04Mn0.77Ga alloy was investigated. The analysis of the temperature dependence of the specific magnetization shows that temperatures of the martensitic and magnetic phase transformations have the following values: MF=325 K, AS=343 K, TC=365 K. The differential scanning calorimetry shows tha...
Article
The plastic behavior during deformation by upsetting and its effect on the microstructure in the polycrystalline Ni2.19Fe0.04Mn0.77Ga alloy are studied. The temperatures of martensitic and magnetic phase transformations were determined by the method for analyzing the temperature dependence of the specific magnetization as MF = 320 K, AS = 360 K, an...
Article
Full-text available
Blood pressure (BP) rhythm is exhibited in a circadian pattern regulated by complex system of endogenous factors. Administration of pharmacological treatment at the right time can influence the efficacy of treatment; but while kidneys play significant role in BP regulation, little is known about their role in chronopharmacotherapy. This study aimed...
Article
In the paper, microstructure design by means of hot working and heat treatment as well as some mechanical properties have been considered for intermetallic alloys based on γ(TiAl) and O(Ti2AlNb) phase. It has been shown that the current scientific and technical knowledge creates the prerequisites for development of both cast and wrought processing...
Article
Full-text available
The paper presents the results of plastic deformation by the multiple isothermal forging on microstructure and martensitic transformation in polycrystalline Ni54.1Mn19.6Ga24.6Si1.7 alloy. The method of plastic deformation was applied to Heusler alloys for the first time. By recording the temperature dependence of thermal expansion in the field of t...
Article
The paper presents the results of studies on the effect of deformation nanostructuring of cathodes from aluminum alloy Al-6%Mg on the glow gas-discharge current in a discharge device. Microstructure and work function of nanostructured alloy are studied. It is shown that a decrease of the work function as a result of alloy nanostructuring leads to a...
Article
The present work is devoted to the development of the production of three-layered hollows structures made of VT6 titanium alloy by means of superplastic forming (SPF) and pressure welding. Finite-element modeling can be successfully applied to optimize the forming process, if the adequate constitutive relations would be defined and the friction at...
Article
Full-text available
Babbitt alloys are traditionally used as a material for sliding bearings of large-sized units. The structure of babbit Sn11Sb5,5Cu consists of three phases: α-phase, which is a solid solution of antimony and copper in the tin, β-phase is a SnSb crystal with hexagonal and rhombohedral lattice and small η-phase (Cu6Sn5 compound). Refinement of presen...
Article
The effect of heat and thermomechanical treatments conditions on the microstructure and main mechanical characteristics (obtained by tensile, high-temperature long-term strength, fracture toughness, and high-cycle fatigue tests) of the Ti–45Al–5Nb–1Mo–0.2B (аt %) alloy was studied. Before the treatments, the sequence of phase transformations in the...
Article
Full-text available
Investigations of technological properties of new titanium alloy sheet VST2k have been conducted. It is found that the titanium alloy has a good solid state weldability and formability under conditions of superplasticity at temperatures 750-900C. By the method of SPF/DB sheet of VST2k alloy in a low-temperature superplasticity at a temperature of...
Article
Full-text available
The structure and properties of a polycrystalline Ni–Mn–In Heusler alloy have been studied after a plastic deformation by upsetting. An analysis of points of a martensitic and magnetic phase transformations shows that the martensite transformation takes place at temperatures lower than the Curie point. At high temperatures in the range 930–1110 K t...
Article
Full-text available
Aim: The aim of this study is to identify a possible damage to heart ventricles caused by supraphysiological doses of testosterone, voluntary physical activity or their combination. Methods: In the 8-week long experiment, 10-12 weeks old male Wistar rats were administered testosterone depot in dose of 100 mg/kg (TES, n = 15) or vehiculum (CON, n =...
Article
Full-text available
Equilibrium structures obtained by linking with valence bonds the carbon carcasses of two fullerene-like molecules have been studied by molecular dynamics simulation. In free fullerene, carbon atoms form sp 2 hybridized bonds, but at places of links between fullerenes, sp 3 hybridized bonds are formed, which determines the changes in the properties...
Article
The results of development of new resource-saving technologies of local shape-forming under superplastic deformation conditions (SP) by means of roll-forming and rotary swaging are presented. These technologies are efficient for fabrication of discs, shells, rings up to 800 mm in diameter, as well as hollow shafts made of heat-resistant nickel-, ti...