D. Gurianov, E. Khoroshko, A. Gusarova, A. Chumaevskii
The structure and tribological properties of polymetallic products from Cu-Ti system are investigated. The results of the work show that in the material obtained by successive deposition of titanium and copper filaments on the substrate, a complex structure is formed from a mixture of intermetallic phases with different composition. Friction tests show high tribological properties paired with a steel counterbody. Besides the hardened state associated with the presence of Cu4Ti intermetallic particles, the material of the samples is characterized by the plasticity preservation of the copper matrix, which increases the tribological properties of the finished product.
{"title":"Tribological properties of copper-titanium polymetals obtained by the additive manufacturing","authors":"D. Gurianov, E. Khoroshko, A. Gusarova, A. Chumaevskii","doi":"10.1063/1.5131996","DOIUrl":"https://doi.org/10.1063/1.5131996","url":null,"abstract":"The structure and tribological properties of polymetallic products from Cu-Ti system are investigated. The results of the work show that in the material obtained by successive deposition of titanium and copper filaments on the substrate, a complex structure is formed from a mixture of intermetallic phases with different composition. Friction tests show high tribological properties paired with a steel counterbody. Besides the hardened state associated with the presence of Cu4Ti intermetallic particles, the material of the samples is characterized by the plasticity preservation of the copper matrix, which increases the tribological properties of the finished product.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85729337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A special place in the Arctic zone of Russia is occupied by the shelf of the Barents Sea. Russian official sources estimate the oil reserves of the Barents Sea at around 400 million tons of which only a quarter, about 100 million tons, is confirmed [1]. Industrial development of oil fields in the Arctic zone takes place in the most difficult conditions and requires the use of new unique technologies. Poor compliance with oil spill prevention measures has already led to large-scale environmental pollution in the Arctic zone of Russia. The cause of pollution is the operation of marine stationary platforms, accompanied by the construction of shore-based terminals, hydrocarbon storage facilities, offshore pipeline lay, drilling operations, and increased shipping.A special place in the Arctic zone of Russia is occupied by the shelf of the Barents Sea. Russian official sources estimate the oil reserves of the Barents Sea at around 400 million tons of which only a quarter, about 100 million tons, is confirmed [1]. Industrial development of oil fields in the Arctic zone takes place in the most difficult conditions and requires the use of new unique technologies. Poor compliance with oil spill prevention measures has already led to large-scale environmental pollution in the Arctic zone of Russia. The cause of pollution is the operation of marine stationary platforms, accompanied by the construction of shore-based terminals, hydrocarbon storage facilities, offshore pipeline lay, drilling operations, and increased shipping.
{"title":"Risks of pollution of Arctic territories by oil and oil products","authors":"M. Alekseeva, L. I. Svarovskaya, I. Yashchenko","doi":"10.1063/1.5131876","DOIUrl":"https://doi.org/10.1063/1.5131876","url":null,"abstract":"A special place in the Arctic zone of Russia is occupied by the shelf of the Barents Sea. Russian official sources estimate the oil reserves of the Barents Sea at around 400 million tons of which only a quarter, about 100 million tons, is confirmed [1]. Industrial development of oil fields in the Arctic zone takes place in the most difficult conditions and requires the use of new unique technologies. Poor compliance with oil spill prevention measures has already led to large-scale environmental pollution in the Arctic zone of Russia. The cause of pollution is the operation of marine stationary platforms, accompanied by the construction of shore-based terminals, hydrocarbon storage facilities, offshore pipeline lay, drilling operations, and increased shipping.A special place in the Arctic zone of Russia is occupied by the shelf of the Barents Sea. Russian official sources estimate the oil reserves of the Barents Sea at around 400 million tons of which only a quarter, about 100 million tons, is confirmed [1]. Industrial development of oil fields in the Arctic zone takes place in the most difficult conditions and requires the use of new unique technologies. Poor compliance with oil spill prevention measures has already led to large-scale environmental pollution in the Arctic zone of Russia. The cause of pollution is the operation of marine stationary platforms, accompanied by the construction of shore-based terminals, hydrocarbon storage facilities, offshore pipeline lay, drilling operations, and increased shipping.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80421997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Deformation and fracture of polycrystalline microstructures typical for different zones of friction stir welds are numerically investigated. A phenomenological physically-based dislocation model is used to describe the dynamic behavior of aluminum. The ordinary differential constitutive equation is solved to determine the model parameter for the Al6061-T6 alloy. Using this equation, two-dimensional calculations are carried out for aluminum specimens subjected to tension at different strain rates, with the polycrystalline microstructure observed in the nugget and thermo-mechanically affected zone on the advancing side of the weld being taken into account in an explicit form. Convergence of the numerical solution is proved. Fracture patterns are shown to depend on the strain rate.Deformation and fracture of polycrystalline microstructures typical for different zones of friction stir welds are numerically investigated. A phenomenological physically-based dislocation model is used to describe the dynamic behavior of aluminum. The ordinary differential constitutive equation is solved to determine the model parameter for the Al6061-T6 alloy. Using this equation, two-dimensional calculations are carried out for aluminum specimens subjected to tension at different strain rates, with the polycrystalline microstructure observed in the nugget and thermo-mechanically affected zone on the advancing side of the weld being taken into account in an explicit form. Convergence of the numerical solution is proved. Fracture patterns are shown to depend on the strain rate.
{"title":"Strain rate effect on the deformation and fracture in different zones of friction stir welded aluminum","authors":"R. Balokhonov, V. Romanova, M. Sergeev","doi":"10.1063/1.5131897","DOIUrl":"https://doi.org/10.1063/1.5131897","url":null,"abstract":"Deformation and fracture of polycrystalline microstructures typical for different zones of friction stir welds are numerically investigated. A phenomenological physically-based dislocation model is used to describe the dynamic behavior of aluminum. The ordinary differential constitutive equation is solved to determine the model parameter for the Al6061-T6 alloy. Using this equation, two-dimensional calculations are carried out for aluminum specimens subjected to tension at different strain rates, with the polycrystalline microstructure observed in the nugget and thermo-mechanically affected zone on the advancing side of the weld being taken into account in an explicit form. Convergence of the numerical solution is proved. Fracture patterns are shown to depend on the strain rate.Deformation and fracture of polycrystalline microstructures typical for different zones of friction stir welds are numerically investigated. A phenomenological physically-based dislocation model is used to describe the dynamic behavior of aluminum. The ordinary differential constitutive equation is solved to determine the model parameter for the Al6061-T6 alloy. Using this equation, two-dimensional calculations are carried out for aluminum specimens subjected to tension at different strain rates, with the polycrystalline microstructure observed in the nugget and thermo-mechanically affected zone on the advancing side of the weld being taken into account in an explicit form. Convergence of the numerical solution is proved. Fracture patterns are shown to depend on the strain rate.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90607688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The multifunctional chemical composition based on surfactants and possessing both oil-driving and flow-diverting properties has been developed at the IPC SB RAS. The investigation of the physicochemical properties of the composition performed at 100°С at three pressure values 7.5, 9.5, and 12 MPa and three carbon dioxide concentrations 20, 40, and 60 mol % has revealed that the pattern of changes in physicochemical properties of the composition are almost the same as when the composition was thermostated without CO2. The low temperature composition has a low interfacial tension at the boundary with oil. The urea is partially hydrolyzed during the thermostating. The pH rises and initiates a hydrolysis of aluminum ions. Upon completion of the hydrolytic polycondensation reaction aluminum hydroxide sols are formed. The degree of urea hydrolysis decreases with increasing concentration of CO2 in the reactor. This occurs regardless of the time of thermostating, as with an increase in the concentration of the product of urea hydrolysis reaction—CO2, the equilibrium shifts towards the reverse reaction, that is, towards the formation of urea. Based on the studies performed, it can be concluded that the injection of a multifunctional chemical composition together with carbon dioxide into the reservoir can significantly enhance the oil recovery.The multifunctional chemical composition based on surfactants and possessing both oil-driving and flow-diverting properties has been developed at the IPC SB RAS. The investigation of the physicochemical properties of the composition performed at 100°С at three pressure values 7.5, 9.5, and 12 MPa and three carbon dioxide concentrations 20, 40, and 60 mol % has revealed that the pattern of changes in physicochemical properties of the composition are almost the same as when the composition was thermostated without CO2. The low temperature composition has a low interfacial tension at the boundary with oil. The urea is partially hydrolyzed during the thermostating. The pH rises and initiates a hydrolysis of aluminum ions. Upon completion of the hydrolytic polycondensation reaction aluminum hydroxide sols are formed. The degree of urea hydrolysis decreases with increasing concentration of CO2 in the reactor. This occurs regardless of the time of thermostating, as with an increase in the concentration of the pr...
{"title":"Thermobaric studies of multifunctional composition based on surfactants","authors":"D. Filatov, E. A. Rozhdestvenskiy, L. Altunina","doi":"10.1063/1.5131967","DOIUrl":"https://doi.org/10.1063/1.5131967","url":null,"abstract":"The multifunctional chemical composition based on surfactants and possessing both oil-driving and flow-diverting properties has been developed at the IPC SB RAS. The investigation of the physicochemical properties of the composition performed at 100°С at three pressure values 7.5, 9.5, and 12 MPa and three carbon dioxide concentrations 20, 40, and 60 mol % has revealed that the pattern of changes in physicochemical properties of the composition are almost the same as when the composition was thermostated without CO2. The low temperature composition has a low interfacial tension at the boundary with oil. The urea is partially hydrolyzed during the thermostating. The pH rises and initiates a hydrolysis of aluminum ions. Upon completion of the hydrolytic polycondensation reaction aluminum hydroxide sols are formed. The degree of urea hydrolysis decreases with increasing concentration of CO2 in the reactor. This occurs regardless of the time of thermostating, as with an increase in the concentration of the product of urea hydrolysis reaction—CO2, the equilibrium shifts towards the reverse reaction, that is, towards the formation of urea. Based on the studies performed, it can be concluded that the injection of a multifunctional chemical composition together with carbon dioxide into the reservoir can significantly enhance the oil recovery.The multifunctional chemical composition based on surfactants and possessing both oil-driving and flow-diverting properties has been developed at the IPC SB RAS. The investigation of the physicochemical properties of the composition performed at 100°С at three pressure values 7.5, 9.5, and 12 MPa and three carbon dioxide concentrations 20, 40, and 60 mol % has revealed that the pattern of changes in physicochemical properties of the composition are almost the same as when the composition was thermostated without CO2. The low temperature composition has a low interfacial tension at the boundary with oil. The urea is partially hydrolyzed during the thermostating. The pH rises and initiates a hydrolysis of aluminum ions. Upon completion of the hydrolytic polycondensation reaction aluminum hydroxide sols are formed. The degree of urea hydrolysis decreases with increasing concentration of CO2 in the reactor. This occurs regardless of the time of thermostating, as with an increase in the concentration of the pr...","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90230544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, the fracture features of a titanium alloy Ti-6Al-4V samples obtained using the electron beam wire-feed additive manufacturing have been investigated. Studies have shown that the main character of sample fracture is viscous, with an in-grained dimple rupture observed. The strongest samples are characterized by the absence of defects in the fracture structure. For some samples, there are pores with sufficiently large sizes. Sample tests show a low dependence of mechanical properties on the direction of the applied load. Mechanical properties of the whole series of samples vary within the range of 3 – 6 %.In this work, the fracture features of a titanium alloy Ti-6Al-4V samples obtained using the electron beam wire-feed additive manufacturing have been investigated. Studies have shown that the main character of sample fracture is viscous, with an in-grained dimple rupture observed. The strongest samples are characterized by the absence of defects in the fracture structure. For some samples, there are pores with sufficiently large sizes. Sample tests show a low dependence of mechanical properties on the direction of the applied load. Mechanical properties of the whole series of samples vary within the range of 3 – 6 %.
{"title":"Fracture characteristics of titanium alloy samples obtained by electron beam additive manufacturing","authors":"K. Kalashnikov, K. Osipovich","doi":"10.1063/1.5132014","DOIUrl":"https://doi.org/10.1063/1.5132014","url":null,"abstract":"In this work, the fracture features of a titanium alloy Ti-6Al-4V samples obtained using the electron beam wire-feed additive manufacturing have been investigated. Studies have shown that the main character of sample fracture is viscous, with an in-grained dimple rupture observed. The strongest samples are characterized by the absence of defects in the fracture structure. For some samples, there are pores with sufficiently large sizes. Sample tests show a low dependence of mechanical properties on the direction of the applied load. Mechanical properties of the whole series of samples vary within the range of 3 – 6 %.In this work, the fracture features of a titanium alloy Ti-6Al-4V samples obtained using the electron beam wire-feed additive manufacturing have been investigated. Studies have shown that the main character of sample fracture is viscous, with an in-grained dimple rupture observed. The strongest samples are characterized by the absence of defects in the fracture structure. For some samples, there are pores with sufficiently large sizes. Sample tests show a low dependence of mechanical properties on the direction of the applied load. Mechanical properties of the whole series of samples vary within the range of 3 – 6 %.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78828076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The influence of phase composition on the manifestations of the Portevin–Le Chatelier effect was studied in Al-Mg alloys using the digital image correlation technique. The smooth deformation curves were observed for Al-3Mg and Al-4.57Mg-0.35Mn-0.2Sc-0.09Zr alloys, whereas type A serration can be distinguished on the deformation curve of Al-5.4Mg-0.52Mn-0.1Zr alloy. At the same time, both the smooth plastic deformation and the stress serration are related to the propagation of a deformation band. The band velocity and the band passed distance for investigated alloys were estimated.
{"title":"Influence of the phase composition of Al-Mg alloys on the propagation of deformation bands","authors":"D. Yuzbekova, Y. Borisova, A. Mogucheva","doi":"10.1063/1.5132262","DOIUrl":"https://doi.org/10.1063/1.5132262","url":null,"abstract":"The influence of phase composition on the manifestations of the Portevin–Le Chatelier effect was studied in Al-Mg alloys using the digital image correlation technique. The smooth deformation curves were observed for Al-3Mg and Al-4.57Mg-0.35Mn-0.2Sc-0.09Zr alloys, whereas type A serration can be distinguished on the deformation curve of Al-5.4Mg-0.52Mn-0.1Zr alloy. At the same time, both the smooth plastic deformation and the stress serration are related to the propagation of a deformation band. The band velocity and the band passed distance for investigated alloys were estimated.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85928491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Kaftaranova, N. Artyukhova, S. Anikeev, A. Garin, A. Monogenov, V. Gunther
Structural features of TiNi-based alloys with different Ti contents in the B2 matrix phase were studied at the stage of production of a porous monolithic structure. It was shown that the main feature of the alloys is homogeneity of the structure formed, which enabled their use for production of a porous monolithic structure. The study showed the efficiency of additional mechanical grinding of the monolithic plate surface to provide a more developed surface. It was found that at the boundary of transition of the porous zone to the monolithic one, powder particles are sintered to a monolithic TiNi plate, and its structure does not show an increase in the concentration of particles of the secondary phases Ti2Ni and Ti4Ni2 (O, N, C) and softening of the structure formed.Structural features of TiNi-based alloys with different Ti contents in the B2 matrix phase were studied at the stage of production of a porous monolithic structure. It was shown that the main feature of the alloys is homogeneity of the structure formed, which enabled their use for production of a porous monolithic structure. The study showed the efficiency of additional mechanical grinding of the monolithic plate surface to provide a more developed surface. It was found that at the boundary of transition of the porous zone to the monolithic one, powder particles are sintered to a monolithic TiNi plate, and its structure does not show an increase in the concentration of particles of the secondary phases Ti2Ni and Ti4Ni2 (O, N, C) and softening of the structure formed.
研究了不同Ti含量的B2基体Ti基合金在制备多孔整体结构阶段的组织特征。结果表明，该合金的主要特征是形成的组织均匀性，这使其能够用于生产多孔整体结构。研究表明，单片表面附加机械磨削的效率可以提供一个更发达的表面。研究发现，在多孔区向整体区过渡的边界处，粉末颗粒烧结成整体TiNi板，其结构没有表现出二次相Ti2Ni和Ti4Ni2 (O, N, C)颗粒浓度的增加和所形成的结构的软化。研究了不同Ti含量的B2基体Ti基合金在制备多孔整体结构阶段的组织特征。结果表明，该合金的主要特征是形成的组织均匀性，这使其能够用于生产多孔整体结构。研究表明，单片表面附加机械磨削的效率可以提供一个更发达的表面。研究发现，在多孔区向整体区过渡的边界处，粉末颗粒烧结成整体TiNi板，其结构没有表现出二次相Ti2Ni和Ti4Ni2 (O, N, C)颗粒浓度的增加和所形成的结构的软化。
{"title":"Study of structural features of monolithic TiNi-based alloy to produce porous monolithic structures","authors":"M. Kaftaranova, N. Artyukhova, S. Anikeev, A. Garin, A. Monogenov, V. Gunther","doi":"10.1063/1.5132010","DOIUrl":"https://doi.org/10.1063/1.5132010","url":null,"abstract":"Structural features of TiNi-based alloys with different Ti contents in the B2 matrix phase were studied at the stage of production of a porous monolithic structure. It was shown that the main feature of the alloys is homogeneity of the structure formed, which enabled their use for production of a porous monolithic structure. The study showed the efficiency of additional mechanical grinding of the monolithic plate surface to provide a more developed surface. It was found that at the boundary of transition of the porous zone to the monolithic one, powder particles are sintered to a monolithic TiNi plate, and its structure does not show an increase in the concentration of particles of the secondary phases Ti2Ni and Ti4Ni2 (O, N, C) and softening of the structure formed.Structural features of TiNi-based alloys with different Ti contents in the B2 matrix phase were studied at the stage of production of a porous monolithic structure. It was shown that the main feature of the alloys is homogeneity of the structure formed, which enabled their use for production of a porous monolithic structure. The study showed the efficiency of additional mechanical grinding of the monolithic plate surface to provide a more developed surface. It was found that at the boundary of transition of the porous zone to the monolithic one, powder particles are sintered to a monolithic TiNi plate, and its structure does not show an increase in the concentration of particles of the secondary phases Ti2Ni and Ti4Ni2 (O, N, C) and softening of the structure formed.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74346136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Vysotskiy, S. Malopheyev, S. Mironov, R. Kaibyshev
In this work, digital image correlation technique was applied to examine evolution of strain distribution during transverse tensile tests of friction stir welded (FSW) Al-Mg-Si alloy. Due to sharp thermal- as well as strain gradients inherent to FSW process, the microstructure distribution within the joints is usually heterogeneous and thus the mechanical response is expected to be not uniform. Indeed, the tensile strain was found to preferentially concentrate in a heat-affected zone, presumably due coarsening of strengthening precipitates in this microstructural region and the concomitant material softening. With subsequent tensile deformation, however, the strain also expanded to a relatively hard stir zone and this observation was attributed to a work hardening effect. Nevertheless, the tensile strain was shown to have highly localized character and this resulted in premature failure of the joints.In this work, digital image correlation technique was applied to examine evolution of strain distribution during transverse tensile tests of friction stir welded (FSW) Al-Mg-Si alloy. Due to sharp thermal- as well as strain gradients inherent to FSW process, the microstructure distribution within the joints is usually heterogeneous and thus the mechanical response is expected to be not uniform. Indeed, the tensile strain was found to preferentially concentrate in a heat-affected zone, presumably due coarsening of strengthening precipitates in this microstructural region and the concomitant material softening. With subsequent tensile deformation, however, the strain also expanded to a relatively hard stir zone and this observation was attributed to a work hardening effect. Nevertheless, the tensile strain was shown to have highly localized character and this resulted in premature failure of the joints.
{"title":"Tensile behavior of friction stir welded Al-Mg-Si alloy","authors":"I. Vysotskiy, S. Malopheyev, S. Mironov, R. Kaibyshev","doi":"10.1063/1.5132258","DOIUrl":"https://doi.org/10.1063/1.5132258","url":null,"abstract":"In this work, digital image correlation technique was applied to examine evolution of strain distribution during transverse tensile tests of friction stir welded (FSW) Al-Mg-Si alloy. Due to sharp thermal- as well as strain gradients inherent to FSW process, the microstructure distribution within the joints is usually heterogeneous and thus the mechanical response is expected to be not uniform. Indeed, the tensile strain was found to preferentially concentrate in a heat-affected zone, presumably due coarsening of strengthening precipitates in this microstructural region and the concomitant material softening. With subsequent tensile deformation, however, the strain also expanded to a relatively hard stir zone and this observation was attributed to a work hardening effect. Nevertheless, the tensile strain was shown to have highly localized character and this resulted in premature failure of the joints.In this work, digital image correlation technique was applied to examine evolution of strain distribution during transverse tensile tests of friction stir welded (FSW) Al-Mg-Si alloy. Due to sharp thermal- as well as strain gradients inherent to FSW process, the microstructure distribution within the joints is usually heterogeneous and thus the mechanical response is expected to be not uniform. Indeed, the tensile strain was found to preferentially concentrate in a heat-affected zone, presumably due coarsening of strengthening precipitates in this microstructural region and the concomitant material softening. With subsequent tensile deformation, however, the strain also expanded to a relatively hard stir zone and this observation was attributed to a work hardening effect. Nevertheless, the tensile strain was shown to have highly localized character and this resulted in premature failure of the joints.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72591337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the paper, we theoretically studied the dynamics of mode II crack propagation in brittle solids with taking into account the finite duration of incubation of local fracture. The study was carried out by computer simulation using the movable cellular automaton method. We analyzed the influence of the magnitude of fracture incubation time on the fulfillment of the scale-invariance condition of dynamic crack propagation. We proposed a definition of this condition in terms of fracture incubation time and introduced a new physically based criterion to classify structural levels of fracture in brittle materials.
{"title":"Fracture incubation time and scale invariance of dynamic crack propagation in brittle solids","authors":"A. Grigoriev, E. Shilko","doi":"10.1063/1.5131983","DOIUrl":"https://doi.org/10.1063/1.5131983","url":null,"abstract":"In the paper, we theoretically studied the dynamics of mode II crack propagation in brittle solids with taking into account the finite duration of incubation of local fracture. The study was carried out by computer simulation using the movable cellular automaton method. We analyzed the influence of the magnitude of fracture incubation time on the fulfillment of the scale-invariance condition of dynamic crack propagation. We proposed a definition of this condition in terms of fracture incubation time and introduced a new physically based criterion to classify structural levels of fracture in brittle materials.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74710095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Fedorischeva, A. Nikonenko, M. Kalashnikov, I. Bozhko, V. Sergeev
TEM research of the structure of the multilayered coatings consisting of the alternating Si-Al-N and Zr-Y-O layers an equal thickness was carried out. The Zr-Y-O layers in the Zr-Y-O / Si-Al-N multilayer coating have a columnar structure, the diameter of a column reaches 80 nm, the column height is about 1000 nm, which, in this case, corresponds to the thickness of the deposited layer. The structure of the Si-Al-N layers is amorphous. High temperature annealing at 900 °С for 20-120 min leads to a change in the structural-phase state. The untransformable t’ phase appears at a temperature of 900 °С after a 20 minute exposure, the grain size reaches its maximal value after a 70 minute exposure and does not change further.TEM research of the structure of the multilayered coatings consisting of the alternating Si-Al-N and Zr-Y-O layers an equal thickness was carried out. The Zr-Y-O layers in the Zr-Y-O / Si-Al-N multilayer coating have a columnar structure, the diameter of a column reaches 80 nm, the column height is about 1000 nm, which, in this case, corresponds to the thickness of the deposited layer. The structure of the Si-Al-N layers is amorphous. High temperature annealing at 900 °С for 20-120 min leads to a change in the structural-phase state. The untransformable t’ phase appears at a temperature of 900 °С after a 20 minute exposure, the grain size reaches its maximal value after a 70 minute exposure and does not change further.
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