About
130
Publications
17,899
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,700
Citations
Introduction
Current institution
Current position
- Principal Investigator
Publications
Publications (130)
The paper studies the behavior of homogenized ingot of the aluminum alloy 1570C with the grain size of 25 μm and low amount of excess phases after rolling at liquid nitrogen temperature to 75% reduction. Structural changes during rolling involve the formation of the dislocation cell structure in the highly deformed matrix, controlled by a low diffu...
The changes in structure and strength of the 1965 aluminum alloy ingot caused by the isothermal multi-step forging and cryorolling are analyzed. It is shown that forging, in addition to refining grains and excess phases, increases the homogeneity of the spatial distribution of transition metal (TM) aluminides and improves the alloy strength and duc...
The intergranular corrosion (IGC) resistance of the 1965 aluminum alloy with complex transition metal (TM) additions before and after thermomechanical treatment of the homogenized ingot, including quenching, severe isothermal hot multidirectional forging and cryogenic rolling, and natural aging, was investigated. The alloy structure and the charact...
Abstract: The effects of rolling temperature reduced to the cryogenic range and the energy of subsequent high-dense electric
pulsing (HDEP) on the structure and hardness of a commercial alloy 1570C (Al-5.0Mg-0.18Mn-0.20Sc-0.08Zr-0.01Fe-0.01Si, wt.%)
containing nanoscale Al3(Sc, Zr) precipitates were investigated. The homogenized ingot was isotherma...
Abstract: Scanning electron microscopy, X-ray diffraction analysis and hardness measurements were used to study changes in
the structure and strength of pure nickel subjected to furnace annealing after isothermal cryogenic rolling at liquid nitrogen
temperature in the range of 30 – 90 % reductions. The aim of the present study was to evaluate and d...
A synergy effect of cryorolling and high-dense electric pulsing on the structure, texture and hardness of fine-grain Cu is analyzed. More than twice Cu strengthening under rolling with 90% reduction at-196°С was caused by strong rolling texture and work-hardened nanostructure with ~300 nm crystallites and ~30% fraction of high-angle boundaries. Fur...
Abstract. The structural changes in hot-pressed and annealed aluminum alloy 1570 (Al-5.8%Mg-0.32%Sc) during
isothermal multidirectional forging (MF) to strain e=12.6 at 598 K (~0.65 Tm) and strain rate 10-2 s-1 were studied. The
starting material had a partially recrystallized microstructure consisting of 65% large elongated grains with a developed...
The effect of thermomechanical treatment, based on combination of isothermal cryorolling at liquid nitrogen temperature to strains ranging from 30 to 90 % and subsequent single electric pulsing with an integral current density Kj up to 1.6 ×104 A2 s / mm4, on the structure and hardness of an initially coarse-grained pure nickel was studied. It is s...
Microstructure evolution in Al-3 wt pct Cu alloy during equal-channel angular pressing (ECAP) at 423 K (150 °C) (~ 0.5 Tm) was studied. The processing temperature roughly corresponded to the transition point from cold to hot deformation associated with preferred formation of either cellular/deformation band structures, or more equilibrium subgrain...
The data of a comparative analysis of the structure and hardness of pure metals with a face-centered cubic lattice – aluminum, nickel and copper, subjected to complex thermomechanical treatment (TMT), including isothermal cryogenic rolling at liquid nitrogen temperature and subsequent high-density electropulse treatment (EPT) were presented. The ma...
Influence of homogenizing annealing on the parameters of grain structure, phase constituents involving nanoscale aluminides of transition metals, hardness and corrosion resistance of the aluminum alloy 1570C (Al-5Mg-0.18Mn-0.2Sc-0.08Zr, mass.%) ingot was studied to optimize its heat treatment regimes according to a two-stage annealing scheme. At th...
Structural changes in alloy 1570C (Al–5.0Mg–0.18Mn–0.2Sc–0.08Zr) during multidirectional isothermal forging (MIF) to a total strain e = 8.4 at 325°C and a strain rate of 10–4 s–1 were investigated. After homogenization, the alloy had an equiaxed grain structure with an average grain size of 25 μm and a uniform distribution of coherent Al3(Sc,Zr) pr...
The influence of the energy of electric pulse treatment (EPT) in the range of integral current densities (Kj) from 0.06×10(5) to 0.29×10(5) A2s/mm4 on the structure and hardness of coarse-grained high-purity Al, isothermally rolled up to a total strain of 90% at a liquid nitrogen temperature, was studied. It was found that EPT with an energy up to...
Abstract
Mechanisms of grain refnement under multidirectional isothermal forging (MIF) at 325 °C (~0.65Tm) and the strain rate 10−4 s−1 of the Al–Mg-based alloy with complex additions of transition metals were investigated. The starting alloy had an equiaxed grain structure with grain size 25 µm and a uniform distribution of coherent Al3(Sc,Zr) dis...
A comparative study of the structure and mechanical behavior of an Al−5Mg−0.18Mn−0.2Sc−0.08Zr− 0.01Fe−0.01Si (wt.%) alloy ingot subjected to multidirectional isothermal forging (MIF) to a strain of 12 or equal-channel angular pressing (ECAP) to a strain of 10 at 325 °C, and subsequent warm and cold rolling (WR and CR) at 325 and 20 °C, was performe...
Aiming at obtaining the enhanced mechanical properties profile for lightweight applications, bulk billets of the commercial 1570C aluminium alloy (Al-5Mg-0.18Mn-0.20Sc-0.08Zr, wt. %) with nanosized aluminides of transition metals (TM) were subjected to various thermomechanical treatments comprising severe plastic deformation for grain refinement an...
The effect of thermomechanical processing combining one- or two-step isothermal multidirectional forging (MF) and sheet rolling on the structure and mechanical properties of alloy 1570C (Al–5Mg–0.18Mn–0.2Sc–0.02Zr (wt %)) was studied. One-step MF was performed at a temperature of 325°C to a true strain (e) of about 12. In two-step MF, deformation w...
The influence of the energy of electro-pulse processing (EPP) on the structure and hardness of pure nickel deformed at room and liquid nitrogen temperatures is studied. The metal was subjected to isothermal rolling with a strain of 90% and subsequent EPP with integral current densities Kj in the range from 0.06 to 0.19×10 ⁵ A ² s/mm ⁴ corresponding...
Microstructure and mechanical properties of the 1570C aluminum alloy were studied after equal channel angular pressing (ECAP) to the strain of 3 at 325°C and subsequent warm and cold rolling with near 80% reductions at 325°C and 20°C, respectively. Even containing a partially recrystallized bimodal structure with a volume fraction of ultrafine grai...
Evolution of microstructure and microhardness of the cast and homogenized aluminum alloy 1570C (Al-5Mg-0.18Mn-0.2Sc-0.08Zr, wt. %) were studied under multidirectional forging (MDF) with decreasing the temperature. Sequential compression passes were performed at a strain rate of 10-2 s-1 with 90º changing of the loading axes from pass to pass; with...
The effect of multidirectional forging (MDF) with decreasing temperature and subsequent warm and cold rolling on the structure and mechanical behavior of the alloy 1570C (Al-5Mg-0.18Mn-0.2Sc-0.02Zr (wt.%)) was studied. The first MDF step was carried out at a temperature of 325°C to a strain of about 12 and the second step at 250°C to the strain of...
Abstract: The effect of rolling to a total effective strain of 2 at the liquid nitrogen temperature and subsequent natural and artificial aging on the structure and service properties of the pre-quenched hot- pressed 2024 aluminum alloy was investigated. Using optical and electron microscopy, and X-ray analysis, it was found that the cryorolling di...
Samples with diam. 20 mm and thickness 1.5 mm from a high-strength commercial aluminum alloy 1965 with uni- and bimodal size distributions of nanoscale precipitates of aluminides of transition metals, as well as the main strengthening phase, obtained under preliminary heat treatment, were subjected to high-pressure torsion (HPT) under pressure 6 GP...
The structure and hardness of nickel Grade NP2 after rolling at room temperature with a strain of 90 % and subsequent electric pulse treatment with a calculated heating temperature of 550°C carried out 1 to 20 times with a pulse duration of 10 −4 s and intervals between the pulses of 2 min, were investigated. It has been established that electric p...
Abstract. Structural and mechanical behaviors of the 2024 commercial aluminum alloy, differed by heterogeneity of the initial structure, were examined after severe plastic deformation and further annealing. The superior strengthening of the pre-quenched alloy under high-pressure torsion (HPT) at room temperature was caused by the development of a m...
The effect of severe plastic deformation (SPD), realized via multi-directional forging (MDF) at a constant temperature of 325 °C, as well as via a combination of MDF with subsequent room temperature rolling or high pressure torsion, on the microstructure, static and fatigue strength parameters of an ingot of non-age-hardenable commercial aluminum a...
The microstructure and mechanical characteristics of the non-agehardenable complex 1570C (Al-5Mg-0.18Mn-0.2Sc-0.08Zr, wt %) alloy ingot subjected to multi-directional forging with temperature decreasing from 325 to 175°C up to accumulative strain 24 were investigated. It was shown that multi-directional forging with decreasing temperature is the ef...
Structural factors influencing the electrochemical corrosion of 2024 aluminum alloy after conventional strengthening heat treatment and its combination with isothermal rolling at liquid-nitrogen temperature were studied using optical metallography, transmission electron microscopy and electrochemical tests. It is established that the cryorolled and...
Microstructure and superplastic (SP) behavior of the commercial 1570C aluminum alloy was studied after equal channel angular pressing (ECAP) at T = 325°C with a strain of e ∼ 3 and subsequent rolling with reductions about 80% at the same and room temperature. Even containing the bimodal structure with the fraction of ultrafine grains of about 0.3,...
The strain rate effect on ultrafine-grain structure development in the cast Al-Mg-Sc-Zr based alloy during multidirectional isothermal forging was studied. The alloy with the average grain size of 25 μm and coherent Al3(Sc,Zr) precipitates of 25–50 nm in diameter was deformed to a total strain of about 8.4 at 325 °C with strain rates of 10⁻⁴ and 10...
Effects of severe plastic deformation by isothermal сryorolling with a strain of e~2 and subsequent natural and artificial aging on the structure and resistance to intergranular corrosion (IGC) of the preliminary quenched 2024 aluminum alloy of standard and Zr modified compositions were investigated. Increasing the temperature of aging leads to dec...
The microstructure and superplastic characteristics of the commercial alloy 1570C (Al-5Mg-0.18Mn-0.2Sc-0.08Zr-0.01Fe0.01Si, wt.%) subjected to equal channel angular pressing (ECAP) at the temperature of 325°C (about 0.6Tm) to the effective strain of 8 and subsequent isothermal rolling at the same and room temperatures with reductions 86 and 80%, re...
Pre-quenched samples with a diameter of 20 mm and a thickness of 1 mm, cut from commercial hot-pressed rod of the 2024 aluminum alloy, were severely deformed by high-pressure torsion (HPT) with 10 revolutions under a pressure of 6 GPa at room temperature and then annealed for up to 50 hours in the temperature range of 100-190 °C. It was found that...
The effect of preliminary heat treatment on transformations of the grain structure of the aluminum alloy D16 under isothermal rolling at the temperature of liquid nitrogen and subsequent annealing was investigated. It was found that heterogenization by intensifying the nucleation of new grains facilitates the nanostructuring of the alloy during cry...
The structure and mechanical properties of the cast non-age-hardenable complex-alloyed 1570C alloy (Al-5Mg-0.18Mn-0.2Sc-0.08Zr, wt%) were studied after multi-directional isothermal forging at 325 °C up to accumulative strain e ≈ 12 and subsequent annealing in the temperature interval from 325 to 500 °C. It is shown that even amid the absence of sub...
Bulk billets from commercial ingots of the alloy 1570C with different size of aluminides of transition metals were subjected to severe deformation up to the equivalent strain e~24 via multi-step isothermal forging (MIF) with an inter-step temperature decrease from 325 to 175 °C. The high potential of MIF to produce UFG billets with enhanced balance...
The effect of preliminary quenching and subsequent aging at 190°C for 10 h on the structure and the strength of the D16 alloy subjected to high-pressure torsion at room temperature is studied. The strength of the preliminarily quenched and the preliminarily aged alloy is shown to be comparable despite the fact that a more developed nanostructure fo...
Effects of secondary phases on the development of a nanocrystalline structure under severe plastic deformation (SPD) of two high-strength Al-Zn-Mg-Сu alloys with different additions of transition metals (TM) and on parameters of their hardness and tensile strength were investigated. The variety of heterogeneity of the alloy initial structure was co...
This paper reports a strong effect of multi-step forging (MIF) followed by elevated temperature isothermal rolling (IR) on the yield stress in ZK60 Mg alloy. After the MIF stage, the yield stress is slightly higher in the rolling direction (RD) than in the transverse direction (TD). After IR at 300 °C, the anisotropy remains small. In contrast, aft...
Aiming at improving deformability of wrought Mg alloys, the commercial hot-pressed alloy MA14 (ZK60) was subjected to hot/warm severe plastic deformation (SPD) to a total true strain of 9. The processing schedule involved a combination of two-stage multi-step isothermal forging performed at 400 and 300 °C and subsequent isothermal rolling at 300 °C...
Corrosion fatigue data for magnesium alloys are still scarce. The present communication reports the results of microstructural investigations and fatigue testing of the fine grain Mg-Zn-Zr (ZK60) alloy after multiaxial isothermal forging and of the hot extruded Mg-Y-Zn (WZ21) alloy in air and in the 0.9% NaCl water solution. Both of the alloys demo...
Structural and phase factors influencing the intergranular corrosion (IGC) of D16 aluminum alloy after quenching, isothermal rolling at liquid-nitrogen temperature, and subsequent natural and artificial aging were studied by optical metallography, X-ray diffraction, and transmission and scanning electron microscopy. It is established that the alloy...
The data devoted to the high-strain-rate superplasticity of Al-Mg alloys containing dispersoids of aluminides of scandium and zirconium and having ultrafine-grained structure produced by severe plastic deformation were reviewed. The potential of various severe plastic deformation techniques to improve the superplastic characteristics of Al-Mg-Sc(Zr...
Changes in the structure and mechanical properties of the billets from the cast nonage-hardenable complex-alloyed 1570C alloy (Al-5Mg-0.18Mn-0.2Sc-0.08Zr, weight%) were studied during multi-directional isothermal forging with decreasing temperature from 325 to 175°C and subsequent annealing in the temperature interval from 325 to 450°C. It is shown...
The effect of preliminary and post-deformation heat treatment on structure and hardness of severely deformed aluminum alloy D16 was investigated. Pre-quenched and aged at 190 °C from 1 to 10 hrs alloy was subjected to high pressure torsion (HPT) (N=10 turns, P=6 GPA, T=20 °C), and then to re-aging at 100 °C up to 100 hrs. Despite of ~40 HV increase...
General requirements to the initial structure and phase composition of commercial middle- and high-strength age-hardenable aluminum alloys, especially to the parameters of precipitates of main strengthening phases and transition metals aluminides, which are important for nanostructuring of the alloys matrix under processing, involving severe plasti...
Effects of severe plastic deformation by isothermal сryorolling at a temperature of liquid nitrogen with a strain of e ~ 2 and subsequent aging on structure, hardness and resistance to intergranular corrosion (IGC) of the preliminary quenched ingots of the conventional and Zr modified composition of D16 aluminum alloy, were investigated. It was fou...
The effect of multidirectional (abc) forging (MDF) to the strain of about 8.5 at 325°C (∼0.65Tm) and 10⁻² s⁻¹ on the grain refinement of a 1570C Al-Mg-Sc-Zr alloy was investigated. The cast and homogenized alloy had an equiaxed microstructure with the grain size of ∼25 µm and nearly uniform distribution of nanosized (∼5–10 nm in diameter) coherent...
The influence of preliminary heat treatment, involving quenching and further aging at 190°C for 10 h, on the grain structure, hardness, and tensile strength of hot-pressed commercial D16 alloy severely deformed via room-temperature high pressure torsion (HPT) (10 revolutions under P = 6 GPa) was investigated. In spite of higher deformation strength...
Magnesium alloys are promising materials for the surgical implants due to their exceptional mechanical properties, biocompatibility and biodegradability. Binary Mg-Zn and ternary Mg-Zn-Zr alloys are the most obvious candidates for further design of biomaterials. However, they have to meet many requirements, including high strength and corrosion per...
The effect of Al3(Sc,Zr) dispersoids on the evolution of the cast Al-Mg-Sc-Zr alloy structure under multi-directional isothermal forging (MIF) has been investigated. The alloy, which has an equiaxed grain structure with a grain size of ~25 μm and contains dispersoids 5–10 and 20–50 nm in size after onestage (at 360°C for 6 h) and two-stage (360°C f...
The structure of cast and homogenized aluminum alloy 1570C (Al5Mg0.18Mn0.2Sc0.08Zr, wt. %) was studied after multidirectional isothermal forging (MIF). Repetitive upsetting was carried out with changing the loading axis, a 25°C decrease of temperature at each pass starting from 450°C, a pass strain of 0.7 and strain rate of about 10–2 s–1. The allo...
Methods of transmission and scanning electron microscopy were used to investigate an influence of the processing, involving severe isothermal deformation with stage-by-stage decreasing temperature in the range of 200–400°C, realized by multidirectional forging and subsequent rolling, on distribution and size of the second phases in a commercial rod...
Influence of precipitates, formed upon preliminary heat treatment, on the development of a nanocrystalline (NC) structure and hardness of high-strength aluminum alloy with Zr and Sc additions under severe plastic deformation was studied. The samples cut from homogenized ingot were processed by high-pressure torsion (HPT) via 10 revolutions under pr...
The effect of the size of nanoscale Al3(Sc, Zr) precipitates on the grain refinement in 1570C Al alloy (Al-5Mg-0.2Sc-0.08Zr-0.002Be) during multidirectional isothermal forging (MIF) to the total true strain 4.2 at 450oC (0.77Tm) is investigated. At early MIF stages, arraysof new fine (sub)grains with low- and high-angle boundaries are formed near o...
The effect of the size of nanoscale Al 3(Sc, Zr) precipitates on the grain refinement in 1570C Al alloy (Al-5Mg-0.2Sc-0.08Zr-0.002Be) during multidirectional isothermal forging (MIF) to the total true strain 4.2 at 450°C (0.77T m) is investigated. At early MIF stages, arrays of new fine (sub)grains with low- and high-angle boundaries are formed nea...
Abstract.The influence of preliminary heat treatment on the formation of a nanocrystalline (NC) structure and hardness of a 7xxx-type aluminum alloy is analyzed. Specimens, 20 mm in diameter and 1 mm thick, cut from a cast and homogenized ingot, after further quenching and artificial agingat 170 ˚C for 1 to 10 hours were severely deformed by high-p...
Microstructure evolution in the ingot of Al-Mg-Sc-Zr alloy 1570C during multidirectional forging (MDF) to the strain 10.5 at 450°С (~0.77 Тm) and 10–2 s–1 was investigated. The alloy belongs to advanced structural materials exhibiting high strength at ambient temperature. It can be easily hot worked, demonstrates superior superplasticity in a fine-...
Annealing behavior of Al–Mg–Sc–Zr alloy processed by equal-channel angular pressing (ECAP) at 325 °C to various strains and undergone subsequent cold rolling to ∼80% reduction was investigated. ECAP to strain, e ∼3 formed partially recrystallized structure with ultrafine-grain (UFG) mantle zone along the boundaries of initial grains of ∼25 μm size...
The structure transformations in the D16 (2024) aluminum alloy caused by isothermal rolling with effective strain up to e ~3.5 at a temperature of liquid nitrogen were investigated. It is shown that under straining to e ~2.0 the dislocation structure containing cells of the nanometric size is formed. At higher strains the dynamic recovery and conti...
Исследовали эффект предварительной гетерогенизации на особенности трансформации зеренной структуры алюминиевого
сплава Д16 при прокатке при температуре жидкого азота и последующем отжиге с различными скоростями нагрева. Обнаружено, что гетерогенизация, активизируя непрерывную динамическую рекристаллизацию, облегчает деформационное наноструктуриров...
Fatigue properties under axisymmetric push-pull loading of a magnesium alloy Mg-6Zn-0.5Zr (ZK60) after processing by multiaxial isothermal forging (MIF) to a total strain of 4.2 at 400 °C were investigated. The strong influence of the microstructure on the mechanical behavior is demonstrated. Hot severe plastic deformation was shown effective in im...
Microstructure and superplastic behavior of the aluminum alloy 1570C (Al-5Mg-0.2Sc-0.08Zr) after equal channel angular pressing (ECAP) to the strains of e ∼ 3 and 8 at the temperature of 325°C have been analyzed. ECAP to e ∼ 3 resulted in the partially recrystallized structure with the volume fraction and size of new grains of about 30% and 1–2 µm,...
Structure and hardness of the 01570 aluminum alloy joints processed by friction stir welding at various speeds are investigated. It is shown that increasing the traverse tool speed lowers the probability of macrodefect formation in the nugget zone; however, this can lead to anomalous grain growth in the zone of contact with the tool shoulder. Typic...
Optical metallography and electron microscopy have been used to analyze the structural changes in magnesium MA14 alloy subjected to processing that combines multistep isothermal forging and isothermal rolling. It has been found that forging of a bulk workpiece leads to the formation of a structure, 85–90% of which consists of recrystallized grains...
Optical and electron microscopy analyses of friction stir welds out of commercial cast and deformable Al-Mg-x alloys have shown the typical onion-like macrostructure consisting of alternating layers of both the alloys. Maximum microhardness of ~120 Hv has been found in the center of the welds owing to strong grain refinement and exceeding values fo...
Effects of furnace and short electric pulses (SEP) annealing with current density of ~10⁴ A/mm² on the microstructure of the cold-rolled 01570c aluminum alloy, containing high densities of Al3(Sc,Zr) dispersoids, were investigated. The high potential of the SEP annealing to process fine-grained sheets from aluminum alloys with high additions of tra...
Transformations of hot-pressed partially recrystallized structure of the magnesium alloy ZK60 into ultrafine-grained one with the (sub) grain size of ~1 μm under multi-step isothermal forging were analyzed. The mechanisms of recrystallization, as well as the role of the processing temperature and second phases in the development of new grains are d...
The feasibility has been demonstrated for achieving high-strain-rate superplasticity with elongations beyond 2000% in Al-Mg-Sc-Zr alloy with the partially recrystallized structure, produced by warm equal-channel angular pressing to strain of e~3 only. Subsequent alloy ambient temperature rolling up to e~1.6 enhanced the superplastic elongations and...
Commercial extruded rod of 1570 aluminum alloy (Al-5.8%Mg-0.32%Sc) was subjected to equal channel angular pressing (ECAP) at a temperature of 325°С with an effective strain of ~8 and subsequent isothermal rolling at the same or ambient temperature up to strain of about 2.0 and 1.6, respectively. The mechanical behaviour in a wide temperature – stra...
Methods of optical metallography, X-ray diffraction, and transmission and scanning electron microscopy were used to study changes in the structure of the aluminum alloy D16 (2024) caused by isothermal rolling at a temperature of liquid nitrogen. It has been established that the basic structural changes that take place in the material upon deformati...
The effect of multistep isothermal forging (MIF) on microstructure, texture and anisotropy of ambient temperature yield strength of MA14 (Mg-5.8Mg-0.65Zr (%, wt)) magnesium alloy hot-pressed rod was analyzed. It has been found that the initial axial texture is quite stable under 1st MIF step up to strain e∼4.2 at 400°C and has been gradually transf...
Using as-cast homogenized aluminum alloy 1570C, the feasibility has been demonstrated to reach enhanced parameters of high-strain-rate superplasticity with elongations to failure more than 2000% in the alloys of the Al-Mg-Sc-Zr system having the partially recrystal-lized structure, processed by warm equal-channel angular pressing with the effective...
Effects of equal-channel angular pressing (ECAP) at 325°C to a strain, e~10 and post-ECAP annealing for 1 hr in the temperature range of 350-520°C on structure of the cast and homogenized Al-Mg-Sc-Zr alloy 01570C were analyzed. It is found that annealing of ECAP processed material containing near homogeneous ultrafine-grained (UFG) structure with ~...
The effect of multi-step isothermal forging (MIF) on size and distribution of excess phases in the hot-pressed rod of MA14 (Mg-6Zn-0,6Zr) alloy has been investigated using scanning electron microscopy. It is found that MIF practically eliminates typical particle string structure of the hot-pressed rod and results in a considerable decrease in size...
Unique superplastic elongations up to 4100% were achieved at 450°C in the strain rate range of 10⁻²-10⁻¹ s⁻¹ for Al-Mg-Sc-Zr alloy with a grain size ~1 μm processed by warm-to-hot equal channel angular pressing. Such a behavior is attributed to the synergy of complementary factors resulted in high homogeneity and stability of ultrafine-grained micr...
It has been found that cryorolling of the preliminary quenched commercial rod of D16
aluminum alloy at a temperature of liquid nitrogen up to strains of 3.5 results in the well-developed
cellular substructure with separate nanograins inside coarse fibers. Further aging at ambient
and elevated temperature leads to the alloy disperse strengthening ac...
Effect of prior heat treatment on nanostructuring of high-strength 7475 Al alloy, subjected to high-pressure torsion (HPT) at ambient temperature up to strain of ∼7, was investigated. The alloy was (i) solution treated and water quenched, and then (ii) artificially aged before HPT. In distinction with the state (i), the state (ii) was characterized...
Phenomenology and nature of fine-grain structure formation in bulk billet of hot-pressed magnesium alloy MA14 under multistep isothermal forging (MIF) in the temperature range of 200-400 0С to a total strain of 10.2 have been investigated by optical and electron microscopy. It is concluded that the main mechanism of transformation the initial parti...
The durability of chemically deposited Ni based coatings was studied under heat treatment and hot deformation of Zr alloy ingots (Э125) over the temperature range of 700–1000°C. It was shown that a single-layer Ni coating retains its satisfactory protective-lubricating properties up to 800°C. Double-layer Ni-glass lubricant coatings efficiently pro...
We have studied high strain rate deformation of aluminum alloy 01570S with bimodal structure obtained by equal channel angular pressing. It has been demonstrated that, at certain parameters of structure and temperature-strain rate modes of dynamic loading, the alloy can exhibit a high coefficient of strain rate sensitivity m ~ 0. 4 characteristic f...
Superior superplastic behavior with elongations from 3000 to 4100% were found in temperature range of 400-475°C at strain rates 10 -2-10 -1s -1 for the severely deformed Al-5Mg-0.18Mn-0.2Sc-0.08Zr-0.01Fe-0.01Si alloy having homogeneous and thermally stable ultrafine-grain structure with ~1μm grain size and low amount of coarse excess phases. © 2012...
Superplastic (SP) properties of an Al−5%Mg−0.2%Sc−0.08%Zr alloy subjected to equal channel angular pressing (ECAP) at T=325°C with an effective stain of ~ 8 and subsequent rolling at the same and ambient temperatures were studied. It has been shown that the formation of ultrafine grained (UFG) structure with the grain size of about 1 μm and the vol...
The developed dislocation structure that forms during cryorolling of a D16 alloy is found to be retained after short-term
heating to 200°C. At higher temperatures, it undergoes recovery and recrystallization with the formation and growth of nanograins.
Rolling intensify the decomposition of a preliminarily supersaturated aluminum solid solution, pr...
The effects of short electric pulses with duration of ~ 100 ms and the current density of ~ 104 A/mm2 on the structure and microhardness of cold-rolled aluminum alloy 1570С were investigated.It was found that such a treatment activates static recrystallization, resulting in the alloy microhardness decrease and formation of partially recrystallized...
