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Influence of Zr and Mn additions on microstructure and properties of Mg-2.5wt%Cu-Xwt%Zn(X=2.5,5 and 6.5)alloys

International Journal of Minerals,Metallurgy and Materials 2022年第9期29卷 1733-1745页

作者： A.v.Koltygin v.E.Bazhenov I.v.Plisetskaya v.A.Bautin A.I.Bazlov N.Y.Tabachkova O.O.voropaeva a.a.komissarov.v.d.belov Foundry department National University of Science and Technology(MISiS)Moscow 119049Russia department of Metallurgy Steel New Production Technologies and Protection of MetalsNational University of Science and Technology(MISiS)Moscow 119049Russia Laboratory of Advanced Green Materials National University of Science and Technology(MISiS)Moscow 119049Russia department of Materials Science of Semiconductors and dielectrics National University of Science and Technology(MISiS)Moscow 119049Russia Fianit Laboratory(Laser Materials and Technology Research Center at GPI) Prokhorov General Physics Institute RASMoscow 119991Russia Laboratory of Hybrid Nanostructured Materials National University of Science and Technology(MISiS)Moscow 119049Russia Laboratory of Medical Bioresorption and Bioresistance Moscow State University of Medicine and DentistryMoscow 127473Russia

This work studied the effects of adding Zr and Mn in amounts less than 1wt%on the microstructure,mechanical properties,casting properties,and corrosion resistance of Mg-Zn-Cu alloys containing 2.5wt%Cu and 2.5wt%-6.5wt%*** hardness and electrical conductivity measurements were used to find an optimal heat treatment schedule with the best mechanical *** has been established that Zr significantly increases the yield strength of the alloys due to a strong grain refinement ***,the presence of Mn and Zr has a detrimental effect on alloy’s elongation at *** was shown that the precipitation of the Mg_(2)Cu cathodic phase in the alloy structure negatively affects the corrosion ***,the addition of Mn decreases the corrosion rate of the investigated *** best combination of the mechanical,casting,and corrosion properties were achieved in the alloys containing 2.5wt%Cu and 5wt%***,the Mn or Zr addition can improve the properties of the alloys;for example,the addition of Mn or Zr increases the fluidity of the alloys.

关键词： magnesium alloy Mg-Zn-Cu casting alloy Mn addition Zr addition

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Comparison of castability,mechanical,and corrosion properties of Mg−Zn−Y−Zr alloys containing LPSO and W phases

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Transactions of Nonferrous Metals Society of China 2021年第5期31卷 1276-1290页

作者： v.E.BAZHENOv S.S.SAIdOv Yu.v.TSELOvALNIK O.O.vOROPAEvA I.v.PLISETSKAYA A.A.TOKAR A.I.BAZLOv v.A.BAUTIN A.A.komissarov A.v.KOLTYGIN v.d.belov National University of Science and Technology(MISiS) Leninskiy pr.4Moscow119049Russia

The Mg–Zn–Y–Zr alloys with long-period stacking-ordered(LPSO)and W eutectic phases were investigated to develop new magnesium casting *** temperatures for T6 heat treatment were selected based on the hardness and electrical conductivity *** hot tearing susceptibility of the alloys with LPSO phase is lower than that of the alloys with W phase,which is associated with the freezing range of the ***,the investigated alloys displayed the same *** T6 conditions,increasing the Y content in the alloys resulted in increased yield strength,whereas other tensile properties were similar for the *** corrosion resistance was higher for the alloys with LPSO phase compared to that of the alloys with W ***−2.5Zn−3.7Y−0.3Zr(mass fraction,%)alloy with LPSO phase possessed high castability and mechanical properties,with a corrosion rate of 2 mm/year.

关键词： magnesium alloy casting LPSO phase W phase fluidity hot tearing susceptibility corrosion rate

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Siltation and radiocesium pollution of small lakes in different catchment types far from the Fukushima daiichi nuclear power plant accident site

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International Soil and Water Conservation Research 2020年第1期8卷 56-65页

作者： Mikhail komissarov Shin-ichiro Ogura Ufa Institute of Biology Russian Academy of SciencesPr.Oktyabrya 69Ufa450054Russia Graduate School of Agricultural Science Tohoku University232-3 YomogitaNaruko-onsenOsaki989-6711Japan

The Fukushima daiichi nuclear power plant accident caused radioactive pollution in northeastern Honshu Island,*** study examined the influence of snowmelt and rainfall on soil erosion pro-cesses and siltation of small lakes in Miyagi Prefecture(150 km northwest of the power plant).Two sets of slopes and lakes,respectively in pasture and forest catchments,were *** thickness,soil infiltration,surface runoff volume,soil and sediment physicochemical properties,Cs concentration of precipitation,meltwater,and rainwater,and lake siltation rates were *** total radioactive Cs content in precipitation was 0.7-7.4 Bq·L^-1 and was below the Japanese standard(10 Bq·L^-1).Total radioactive Cs was at the allowable level in water flowing down the pasture catchment slope(0.1-9.2 Bq·L^-1)during snowmelt and rainfall,as well as in pasture(0.9-8.8 Bq·L^-1)and forest(0.7-5.2 Bq·L^-1)catchment lake *** was no soil erosion(surface runoff)in the forest *** losses in the pasture catchment were 23 due to rainfall and 9 kg ha^-1 yr^-1 following spring *** snow-melt,a 0.5 and 0.2 mm thick layer of silt was deposited in pasture and forest catchment lakes,respec-tively,and 1.4 and 0.6 mm were deposited during the rainfall *** siltation rates were 1.9 and 0.8 mm·yr^-1 for pasture and forest catchment lakes,*** upper layer of lake bottom sedi-ments is represented mainly by silt fractions(2-50μm),with high organic matter(4.0-5.7%)and radiocesium(1100-1600 kg·ha^-1)contents.

关键词： Fukushima daiichi Radiocesium Siltation Suspended sediment Waterbodies Water turbidity

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Effects of small additions of Zn on the microstructure, mechanical properties and corrosion resistance of WE43B Mg alloys

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International Journal of Minerals,Metallurgy and Materials 2019年第7期26卷 858-868页

作者： A.v. Koltygin v.E. Bazhenov R.S. Khasenova A.A. komissarov A.I. Bazlov v.A. Bautin Foundry department National University of Science and Technology “MISiS” Moscow 119049 Russia Laboratory of Hybrid Nanostructured Materials National University of Science and Technology “MISiS” Moscow 119049 Russia Laboratory of Advanced Green Materials National University of Science and Technology “MISiS” Moscow 119049 Russia department of Metallurgy Steel New Production Technologies and Protection of Metals National University of Science and Technology “MISiS” Moscow 119049 Russia

Zn is a commonly used alloying element for Mg alloys owing to its beneficial effects on mechanical properties. To improve the mechanical and corrosion properties of WE43B Mg alloys, the effects of 0–0.7wt% Zn addition on the microstructure and properties of sample alloys were investigated. Addition of Zn to as-cast WE43B alloy promoted the formation of the Mg12Nd phase;by contrast, after T6 heat treatment, the phase composition of WE43B alloys with and without Zn addition remained mostly the same. A long-period stacking ordered phase was predicted by CALPHAd calculation, but this phase was not observed in either the as-cast or heat-treated Zn-containing WE43B alloys. The optimum temperature and duration of T6 heat treatment were obtained using CALPHAd calculations and hardness measurements. Addition of Zn resulted in a slight reduction in the average grain size of the as-cast and T6 heat-treated WE43B alloys and endowed them with increased corrosion resistance with little effect on their mechanical properties.

关键词： magnesium alloys corrosion resistance mechanical properties Zn addition

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Microstructure and mechanical and corrosion properties of hot-extruded Mg–Zn–Ca–(Mn)biodegradable alloys

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Journal of Magnesium and Alloys 2021年第4期9卷 1436-1451页

作者： v.E.Bazhenov A.v.Li A.A.komissarov A.v.Koltygin S.A.Tavolzhanskii v.A.Bautin O.O.voropaeva A.M.Mukhametshina A.A.Tokar Casting department National University of Science and Technology“MISiS”Leninskiy pr.4Moscow 119049Russia laboratory of hybrid nanostructured materials national university of science and technology“misis”leninskiy pr.4moscow 119049russia department of metallurgy steel new production technologies and protection of metalsnational university of science and technology“misis”leninskiy pr.4moscow 119049russia

Biodegradable Mg-based implants are widely used in clinical applications because they exhibit mechanical properties comparable to those of human bone and require no revision surgery for their *** Mg-based alloys,Mg–Zn–Ca–(Mn)alloys have been extensively investigated for medical applications because the constituent elements of these alloys,Mg,Zn,Ca,and Mn,are present in human tissues as nutrient *** this study,we investigated the effect of the hot extrusion temperature on the microstructure,mechanical properties,and biodegradation rate of Mg–Zn–Ca–(Mn)*** results showed that the addition of Mn and a decrease in the extrusion temperature resulted in grain refinement followed by an increase in the strength and a decrease in the elongation at fracture of the *** alloys showed different mechanical properties along the directions parallel and perpendicular to the extrusion *** corrosion test of the alloys in the Hanks’solution revealed that the addition of Mn significantly reduced the corrosion rate of the *** Mg–2 wt%Zn–0.7 wt%Ca–1 wt%Mn alloy hot-extruded at 300℃ with an ultimate tensile strength of 278MPa,an yield strength of 229MPa,an elongation at fracture of 10%,and a corrosion rate of 0.3 mm/year was found to be suitable for orthopedic implants.

关键词： Biodegradable Mg alloy Mg–Zn–Ca–(Mn) Hot extrusion Mechanical properties Corrosion rate

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Effects of temperature on critical resolved shear stresses of slip and twining in Mg single crystal via experimental and crystal plasticity modeling

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镁合金学报(英文) 2023年第6期11卷 2027-2041页

作者： Kwang Seon Shin Lifei Wang Mingzhe Bian Shihoon Choi Alexander komissarov viacheslav Bazhenov Magnesium Technology Innovation Center Department of Materials Science and EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Laboratory of Medical Bioresorption and Bioresistance Moscow State University of Medicine and DentistryDelegatskaya 20/1Moscow127473 Russia Shanxi Key Laboratory of Advanced Magnesium-Based Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China departments of Advanced Components and Materials Engineering Sunchon National UniversitySuncheonJeonnam57922Republic of Korea Laboratory of Hybrid Nanostructured Materials National University of Science and Technology"MISiS"Leninskiy pr.4Moscow119049 Russia Casting department National University of Science and Technology"MISiS"Leninskiy pr.4Moscow119049 Russia

Magnesium(Mg)single crystal specimens with three different orientations were prepared and tested from room temperature to 733 K in order to systematically evaluate effects of temperature on the critical resolved shear stress(CRSS)of slips and twinning in Mg single *** duplex non-basal slip took place in the temperature range from 613 to 733 K when the single crystal samples were stretched along the*** contrast,the single basal slip and prismatic slip were mainly activated in the temperature range from RT to 733 K when the tensile directions were inclined at an angle of 45°with the basal and the prismatic plane,*** self-consistent(vPSC)crystal modeling simulations with genetic algorithm code(GA-code)were carried out to obtain the best fitted CRSSs of major deformation modes,such as basal slip,prismatic slip,pyramidalⅡ,{1012}tensile twinning and{1011}compressive twinning when duplex slips accommodated ***,CRSSs of the basal and the prismatic slip were derived using the Schmid factor(SF)criterion when the single slip mainly accommodated *** the CRSSs of major deformation modes obtained by the vPSC simulations and the SF calculations,the CRSSs for basal slip and{1012}tensile twinning were found to show a weak temperature dependence,whereas those for prismatic,slip and{1011}compressive twinning exhibited a strong temperature *** the comparison of previous results,vPSC-GA modeling was proved to be an effective method to obtain the CRSSs of various deformation modes of Mg and its alloys.

关键词： Magnesium Single crystal Critical resolve shear stress Slip Twinning

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Emergency Hybrid Correction in a Newborn with Critical Aortic valve Stenosis with Acute Pulmonary Edema in the First Hour after Birth

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Congenital Heart disease 2023年第1期18卷 57-65页

作者： vitaliy Suvorov vladimir Zaitsev Nikolay Pilyugov Olga Tereshenko Michail komissarov Saint Petersburg State Pediatric Medical University Saint-PetersburgRussia

Critical aortic valve stenosis in newborns is the cause of a severe clinical condition with the onset of symptoms during first hours after *** present a clinical case of a successful surgical correction of a critical aortic stenosis using a hybrid method applied in a newborn during the first day of *** infant was diagnosed with a hypoplastic left heart complex with an intact atrial septum(aortic and mitral valves stenosis variant),that led to the cardiogenic shock and acute pulmonary *** procedure included bilateral banding of the pulmonary artery branches and atrioseptostomy with stenting of the interatrial *** surgery was performed through a median sternotomy.

关键词： Critical aortic valve stenosis hybrid correction hybrid Norwood bilateral banding hybrid Norwood procedure acute pulmonary edema intact atrial septum hypoplastic left heart complex

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A detailed reconstruction of changes in the factors and parameters of soil erosion over the past 250 years in the forest zone of European Russia(Moscow region)

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International Soil and Water Conservation Research 2022年第1期10卷 149-160页

作者： Andrey Zhidkin daria Fomicheva Nadezhda Ivanova Tomas dostal Alla Yurova Mikhail komissarov Josef Krasa v.v.dokuchaev soil science institute pyzhevskiy pereulok 7moscow119017russian federation Faculty of geography lomonosov moscow state universityleninskie gorygsp-1moscow119991russian federation department of landscape water conservation faculty of civil engineeringczech technical university in praguethakurova 7prague16629czech republic Ufa institute of biology ufrc russian academy of sciencespr.oktyabrya 69ufa450054russian federation

Accelerated soil erosion is a major threat to soil,and there are great variations in the rate of soil erosion over time due to natural and human-induced *** temperate forest zone of Russia is character-ized by complex stages of land-use history(*** urbanization,agricultural development,land abandonment,etc.).We have for the first time estimated the rates of soil erosion by the WaTEM/SEdEM model(rainfall erosion)and by a regional model(snowmelt erosion)over the past 250 years(from 1780 to 2019)for a 100-km2 study site in the Moscow region of *** calculations were made on the basis of a detailed historical reconstruction of the following factors:the location of the arable land,crop rotation,the rain erosivity factor,and the maximum snow water *** area of arable land has decreased more than 3.5-fold over the past 250 *** the end of the 20th century,the rates of gross erosion had declined more than 5.5-fold(from 28×10^(3) to 5×10^(3) t·ha^(-1)yr^(-1))in comparison with the end of the 18th *** in the boundaries of arable land and also the relief features had led to a significant intra-slope accumulation of *** a result of sediment redeposition within the arable land,the variation in net soil erosion was significantly lower than the variation in gross soil *** changes in arable land area and in crop composition are the factors that have to the greatest extent determined the changes in soil erosion in this territory.

关键词： Anthropogenic soil erosion Soil erosion history Crop rotation Magnetic tracer method WaTEM/SEdEM

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Recent research progress on magnesium alloys in Korea:A review

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Journal of Magnesium and Alloys 2023年第10期11卷 3545-3584页

作者： Sung Hyuk Park Ye Jin Kim Hyun Ji Kim Sang-Cheol Jin Jong Un Lee Alexander komissarov Kwang Seon Shin School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Laboratory of Hybrid Nanostructured Materials National University of Science and TechnologyMoscow 119049Russia Laboratory of Medical Bioresorption and Bioresistance Moscow State University of Medicine and DentistryMoscow 127473Russia Magnesium Technology Innovation Center School of Materials Science and EngineeringSeoul National UniversitySeoul 08826Republic of Korea

This review highlights the recent advancements in Mg research in South Korea with a prime focus on high-speed-extrudable Mg–Bi-based alloys for high productivity and strength, innovative techniques utilizing {10–12} twinning for improved mechanical properties, and alloying and processing methods for enhanced corrosion resistance. High-alloyed Mg–Bi-based alloys possess thermally stable α-Mg matrix and secondary phase, which ensures high-speed extrusion of these alloys at elevated temperatures without hot cracking. Consequently, they exhibit outstanding extrudability with a maximum extrusion speed of up to 70 m/min. Furthermore, their high alloying contents offer excellent strength even after high-speed extrusion through strong solid solution hardening and particle hardening effects, making them suitable for high-performance extruded Mg products. The pre-twinning process utilizing {10–12} twinning and the combined process of pre-twinning and subsequent annealing have shown promise in controlling microstructure and texture of wrought Mg alloys and thus enhancing their mechanical properties. The pre-twinning process enhances tensile strength, fatigue properties, and age-hardening rate of Mg alloys. Furthermore, the combined processes of pre-twinning and subsequent annealing considerably improve their ductility, stretch formability, bending formability,and damping capacity. Efforts have been made to improve the corrosion resistance of Mg alloys through alloying additions, process treatments,and surface coatings. Alloying elements like Ca, Sc, and Sm alter the microstructural features(such as secondary phases and grain size)that affect the corrosion phenomenon. Process treatments such as multidirectional forging, screw rolling, and pulse electron beam can also improve the corrosion resistance by refining the microstructure. Furthermore, advanced surface coating technologies can create durable and corrosion-resistant layers for effectively protecting the Mg alloys. All th

关键词： South Korea Mg–Bi alloys {10–12}twinning Corrosion Mechanical properties

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Gallium-containing magnesium alloy for potential use as temporary implants in osteosynthesis

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Journal of Magnesium and Alloys 2020年第2期8卷 352-363页

作者： viacheslav Bazhenov Andrey Koltygin Alexander komissarov Anna Li vasiliy Bautin Regina Khasenov Alexey Anishchenko Alexander Seferyan Julia komissarova Yuri Estrin Foundry department National University of Science and Technology"MISiS"Leninsky pr.4119049 MoscowRussian Federation Laboratory of Hybrid Nanostructured Materials National University of Science and Technology"MlSiS"Leninsky pr.4119049 MoscowRussian Federation department of Metallurgy of Steel New Production Technologies and Protection of MetalsNational University of Science and Technology"MISiS"Leninsky pr.4119049 MoscowRussian Federation department of Materials Science and Engineering Monash UniversityClayton VIC 3800Australia department of Mechanical Engineering The University of Western AustraliaCrawleyWA 6009Australia

In recent years magnesium alloys have been studied intensively with a view to their potential use in bioresorbable medical *** the present work the microstructure and the corrosion properties of a new bioresorbable Mg-4 wt%Ga-4 wt%Zn alloy and its variants with low Ca,Nd or Y additions were *** alloys are of interest due to the efficacy of gallium as an element inhibiting bone resorption,osteoporosis,Paget's disease,and other illnesses.A severe plastic deformation technique of equal channel angular pressing(ECAP)was shown to provide the alloys with favorable mechanical *** addition,a desirable low rate of degradation in a simulated body fluid(Hanks'solution)was achieved.

关键词： Bioresorbable materials Magnesium alloys Gallium ECAP Hanks'solution Simulated body fluid

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