Elena Korosteleva - Academia.edu (original) (raw)

Papers by Elena Korosteleva

Obrabotka metallov, Dec 15, 2022

Wide applying of additive technology is inhibited by a narrow range of consumables used. Most oft... more Wide applying of additive technology is inhibited by a narrow range of consumables used. Most often the powder mixture is applied as consumables according to functional features of equipment used. Generally the final material composition of the formed part is determined by the mixture of trade powders. It causes the difficulties related to the structure control; it’s homogenously, the degree of faultiness. One solution to this problem is to use consumable powder materials with a pre-formed multicomponent structure, which under the conditions of the additive process can be transformed into a controlled type to ensure the functional properties of the resulting part. Secondary structure formation studies of compacted samples from synthesized multicomponent powder materials were carried out to assess the possible degree of structure transformation of these powders under conditions of vacuum sintering. The composition based on titanium carbide with titanium binder (TiC-50 vol% Ti) was se...

Russian Physics Journal, 2022

The paper presents the structure and phase composition of Ti−Al−Si powder composites produced in ... more The paper presents the structure and phase composition of Ti−Al−Si powder composites produced in different conditions, which include vacuum sintering and self-propagating high-temperature synthesis (SHS). The certain ratios of reactive components are used in experiments for the formation of two-phase composites, matching the TiAl 3 + Ti 5 Si 3 and Ti 3 Al + Ti 5 Si 3 compositions. The vacuum sintering of Ti−Al−Si powder composites provides mostly the formation of the two-phase structure, but the quantitative ratio of the appeared phases can considerably differ from the calculated compositions. The lattice parameters in these phases are rather distorted. The analysis of the synthesis in the wave mode combustion of Ti−Al−Si powder composites shows that the synthesis completes only in the TiAl 3 + Ti 5 Si 3 composite. This allows us to prepare the powder from the synthesized product. The paper analyzes the behavior of the synthesized powder based on the phase composition of the TiAl 3 + Ti 5 Si 3 composite after the vacuum sintering of the powder compacts. It is found that after the 1300°C vacuum sintering of the SHS products based on the TiAl 3 + Ti 5 Si 3 composite, its qualitative phase composition remains with a small change in the quantitative phase composition. The compaction of the SHS products is observed together with the reduction in the residual porosity.

Russian Physics Journal, 2020

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PHYSICAL MESOMECHANICS. MATERIALS WITH MULTILEVEL HIERARCHICAL STRUCTURE AND INTELLIGENT MANUFACTURING TECHNOLOGY, 2020

This paper shows the effect of silicon on structural and phase transformations in aluminum-chromi... more This paper shows the effect of silicon on structural and phase transformations in aluminum-chromium powder compacts during heating in the ambient air at 500°C. Samples were obtained by pressing from a mixture of the powders. The studies were carried out by using X-ray diffraction and metallographic analysis, and measuring the weight gain of the samples. It was found that silicon additives (10–20 at %) block the reaction interaction of aluminum and chromium, that occurred in two-component mixtures (Al-Cr) at 500°C and prevent a significant volume growth of the compacts.

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019, 2019

The structure and properties of the coatings obtained by vacuum-arc evaporation of the experiment... more The structure and properties of the coatings obtained by vacuum-arc evaporation of the experimental sintered cathodes of Ti-Al composition were studied for comparison with the conventionally used titanium and titaniumaluminum metallurgical cathodes. It was established that the coatings of the powder cathodes contain nanocrystalline components, have ultrahigh hardness and wear resistance, and have a low coefficient of friction against steel. The surface roughness of the coatings deposited by evaporation of the experimental powder cathodes is significantly less than that of coatings deposited during simultaneous separate evaporation of single-element titanium and aluminum cathodes.

2014 International Conference on Mechanical Engineering, Automation and Control Systems (MEACS), 2014

Composite powders “TiC - high-chromium iron binder” produced by self-propagating high temperature... more Composite powders “TiC - high-chromium iron binder” produced by self-propagating high temperature synthesis (SHS) from the reaction mixture of titanium, carbon and high chromium iron have been investigated. It was found that the content of the cast iron binder in the reaction mixtures affected the burning rate, combustion temperature and medium-grain size of carbide particles in structure of the composite powder.

Russian Journal of Non-Ferrous Metals, 2013

ABSTRACT Volume changes during solid-phase sintering and the structure and phase composition of m... more ABSTRACT Volume changes during solid-phase sintering and the structure and phase composition of materials sintered of the binary and ternary powder foundry alloys of the Al-Cr(Si,Ti) system are investigated. The powders for sintering were obtained by self-propagating high-temperature synthesis (SHS) in the mixtures of elementary powders of four target compositions with the subsequent crashing of the cakes and sieving of fine fractions. When sintering all the pressings under study, volume shrinkage, which monotonically increased with an temperature rise and the duration of the isothermal holding, take place. The results of structural investigations of the sintered materials, which were performed applying the methods of X-ray structural analysis, electron probe microanalysis, optical and scanning microscopy, are discussed jointly with the results of investigations of the volume variations during sintering.

Izvestiya vysshikh uchebnykh zavedenii. Fizika, 2021

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019, 2019

In this study, structural changes in aluminum-chromium powder compacts were considered during exp... more In this study, structural changes in aluminum-chromium powder compacts were considered during exposure in the air at 500 °C. The samples were obtained by pressing the mixture of aluminum and chromium powders. The studies were carried out with using the X-ray diffraction and the metallographic analysis and by measuring the weight gain of the samples. It was established that the value of the specific mass gain has a complex and ambiguous dependence on the initial porosity of Al-Cr compacts due to phase transformations in powder mixtures. At short-term (up to 30 minutes) 500 °C air heating of the porous compacts significant oxidation does not occur. However, at the long-term exposure at 500 °C the reaction diffusion between aluminum and chromium occurs resulting in Al 13 Cr 2 intermetallic formation and compacts swelling.

Key Engineering Materials, 2016

The paper presents the result of studies of composite powders produced by self-propagating high t... more The paper presents the result of studies of composite powders produced by self-propagating high temperature synthesis (SHS) in the reaction mixtures of titanium, carbon and high chrome cast iron, and electron-beam coatings based on them. It was found that the morphology and dispersion of titanium carbide particles in the SHS-product were determined by cast iron powder content in the reaction mixtures. The effect of content of the SHS powders on the characteristics of electron-beam coatings, including abrasive wear resistance of facing coatings was shown.

Technical Physics Letters, 1997

Abstract“Bioceramic-titanium nickelide” functional composites are proposed and investigated. It i... more Abstract“Bioceramic-titanium nickelide” functional composites are proposed and investigated. It is shown that the incorporation of an alloy (titanium nickelide) possessing superelasticity and shape memory enhances the strength properties of the composite while the porosity through the material needed for the ingrowth of living tissue is maintained. These composites are biocompatible and exhibit a property similar to the superelasticity characteristic of living tissue.

Powder Metallurgy and Metal Ceramics, 1997

Sintering conditions for the fabrication of high strength, porous, permeable, titanium—porous tit... more Sintering conditions for the fabrication of high strength, porous, permeable, titanium—porous titanium composites were determined. The structure and strength properties of porous permeable titanium after inward growth of bone tissue for periods of 1, 3, and 6 months were investigated. The minimum time necessary for the growth of bone tissue into an implant was determined.

Powder Metallurgy and Metal Ceramics, 2014

Brief review of kinetic regularities of Ti x C y-Ti composites synthesis

In the last decade, technologies associated with the formation of complex multilevel heterogeneou... more In the last decade, technologies associated with the formation of complex multilevel heterogeneous and heterophase structures in materials and structures have received intensive development. Studies show that such structures provide the most preferred functional properties. Multicomponent metal-matrix composites (MMC), which include refractory compounds such as carbides, silicides, borides, etc., cause the greatest interest. Their use provides high physicomechanical, chemical and tribological properties. Using different methods of obtaining the MMC from the same elements, it is possible to form a structure of a composite material with different characteristics. As a rule, powder mixtures of titanium, silicon, boron, and carbon are used as precursors of the metal-matrix composite. This can be either a mixture of elemental (monocomponent) powders, or a mixture with powders of ready-made refractory compounds. Among the technological processes of powder metallurgy, the self-propagating high-temperature synthesis (SHS) of multicomponent powder mixtures has received the widest use. As a result of SHS, a metal matrix structure can be formed with refractory solid phases formed directly in the synthesis process. The main condition in this case is the concentration of components, which provides exothermic reactions for the formation of simple or complex compounds (carbides, borides, silicides, intermetallic compounds) depending on the selected elemental composition of the powder mixture. Production of metal-matrix composites based on titanium-refractory element systems from among Si, C or B by traditional sintering from mixtures of elemental powders comes up against difficulties associated with large volume growth due to the formation of a rigid framework from their compounds accompanied by significant heat generation. In order to reduce volumetric growth and obtain an acceptable porosity of the sintered material, the powder of the second component can be replaced by the powder of its refractory compound TimAn, which will make it possible to go from uncontrolled liquid-phase sintering to solid-phase sintering. Additional interest in the presented materials is caused by the prospect of using them in additive technologies. In this case, a number of questions arise related to the behavior of metal matrix compositions under conditions of additional thermal processes (various types of surfacing, sintering, etc.), including the question of the stability or degree of transformation of a heterogeneous structure under such external influence. The use of hardening additives in mixtures of powders or the synthesis of metal matrix structure directly in the process of product formation face additional problems that can be associated with a number of physicochemical characteristics of materials (wettability, different melting points and coefficients of thermal expansion, etc.). The use of synthesized composite powders with an already formed structure instead of mechanical mixtures makes it possible to eliminate segregation (separation) of powder components. At the same time, the microstructure and phase composition of the composite powder upon thermal exposure during the fusion process may change significantly. From the point of view of the additive production of products and parts, the process of layer-by-layer melting or "sintering" of composite powder materials plays an important role. In connection with this, it is of interest to study the behavior of metal-matrix powder composites under vacuum sintering conditions for various combinations of components.

Coatings

Al-Cr and Al-Cr-Si composite cathodes were obtained by the hot compaction of aluminum, chromium, ... more Al-Cr and Al-Cr-Si composite cathodes were obtained by the hot compaction of aluminum, chromium, and silicon powder mixtures. The phase transformations in the surface layer of the Al-Cr-Si composite cathodes subjected to the arc heating were considered. The elemental and phase compositions of the modified cathodes’ surfaces were studied using X-ray diffraction, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The effect of the silicon addition on the structural evolution in the cathode surface during arc evaporation is shown. It was found that an arc impact on the cathode surface resulted in the melting and consequent crystallization of the multiphase mixture of intermetallic compounds and eutectic in the cathode surface layer. Cathode surface layers were found to be depleted of aluminum and silicon due to the ejection of these elements in drop form from the Al-Si liquid layer on the cathode surface. This can result in the change in the elements ra...

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE “PHYSICAL MESOMECHANICS. MATERIALS WITH MULTILEVEL HIERARCHICAL STRUCTURE AND INTELLIGENT MANUFACTURING TECHNOLOGY”

The studies of the structure, hardness and wear resistance of coatings obtained by electron-beam ... more The studies of the structure, hardness and wear resistance of coatings obtained by electron-beam surfacing of "titanium monoboride-titanium carbide-titanium binder" composite powders synthesized from mixtures of titanium boron and carbon in the wave combustion mode were carried out. The ratio effect of titanium borides and carbides on the structure, hardness and abrasive wear of electron-beam coatings based on the synthesized hybrid TiB-TiC-Ti powders was analyzed.

Metals, 2021

Aluminum matrix composites usually contain strengthening particles of refractory compounds (SiC, ... more Aluminum matrix composites usually contain strengthening particles of refractory compounds (SiC, Al2O3) that do not react with the Al matrix. There is a problem in producing the Al matrix composite with inclusion of metals that can generate intermetallic compounds with aluminum. In this case, a conventional sintering of powder mixtures results in high porosity due to volume growth. That is why some new methods of producing dense Al matrix composites are required. A possibility to create a dense powder Al-based composite containing hard components, such as chromium and silicon, without using the sintering process, is considered. This paper presents study results of structural and mechanical properties of Al-Cr and Al-Cr-Si composites produced by hot compaction of powder mixtures. An analysis of the relationship between mechanical properties and structures of Al-Cr and Al-Cr-Si composites is carried out. Optimal values for thermomechanical processing modes that ensure sufficient stren...

AIP Conference Proceedings, 2017

In this study, powder composite materials comprised of TiC and Ti with different ratios are proce... more In this study, powder composite materials comprised of TiC and Ti with different ratios are processed by sintering of Ti and C powder mixtures and self-propagating high-temperature synthesis (SHS) in “Ti+C” system followed by sintering. The microstructure and porosity of obtained composites are investigated and discussed. The dependence of porosity on sintering time is explained theoretically. Optimal regimes that enable to obtain the most homogeneous structure with the least porosity are described.In this study, powder composite materials comprised of TiC and Ti with different ratios are processed by sintering of Ti and C powder mixtures and self-propagating high-temperature synthesis (SHS) in “Ti+C” system followed by sintering. The microstructure and porosity of obtained composites are investigated and discussed. The dependence of porosity on sintering time is explained theoretically. Optimal regimes that enable to obtain the most homogeneous structure with the least porosity are described.

Obrabotka metallov, Dec 15, 2022

Wide applying of additive technology is inhibited by a narrow range of consumables used. Most oft... more Wide applying of additive technology is inhibited by a narrow range of consumables used. Most often the powder mixture is applied as consumables according to functional features of equipment used. Generally the final material composition of the formed part is determined by the mixture of trade powders. It causes the difficulties related to the structure control; it’s homogenously, the degree of faultiness. One solution to this problem is to use consumable powder materials with a pre-formed multicomponent structure, which under the conditions of the additive process can be transformed into a controlled type to ensure the functional properties of the resulting part. Secondary structure formation studies of compacted samples from synthesized multicomponent powder materials were carried out to assess the possible degree of structure transformation of these powders under conditions of vacuum sintering. The composition based on titanium carbide with titanium binder (TiC-50 vol% Ti) was se...

Russian Physics Journal, 2022

The paper presents the structure and phase composition of Ti−Al−Si powder composites produced in ... more The paper presents the structure and phase composition of Ti−Al−Si powder composites produced in different conditions, which include vacuum sintering and self-propagating high-temperature synthesis (SHS). The certain ratios of reactive components are used in experiments for the formation of two-phase composites, matching the TiAl 3 + Ti 5 Si 3 and Ti 3 Al + Ti 5 Si 3 compositions. The vacuum sintering of Ti−Al−Si powder composites provides mostly the formation of the two-phase structure, but the quantitative ratio of the appeared phases can considerably differ from the calculated compositions. The lattice parameters in these phases are rather distorted. The analysis of the synthesis in the wave mode combustion of Ti−Al−Si powder composites shows that the synthesis completes only in the TiAl 3 + Ti 5 Si 3 composite. This allows us to prepare the powder from the synthesized product. The paper analyzes the behavior of the synthesized powder based on the phase composition of the TiAl 3 + Ti 5 Si 3 composite after the vacuum sintering of the powder compacts. It is found that after the 1300°C vacuum sintering of the SHS products based on the TiAl 3 + Ti 5 Si 3 composite, its qualitative phase composition remains with a small change in the quantitative phase composition. The compaction of the SHS products is observed together with the reduction in the residual porosity.

Russian Physics Journal, 2020

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PHYSICAL MESOMECHANICS. MATERIALS WITH MULTILEVEL HIERARCHICAL STRUCTURE AND INTELLIGENT MANUFACTURING TECHNOLOGY, 2020

This paper shows the effect of silicon on structural and phase transformations in aluminum-chromi... more This paper shows the effect of silicon on structural and phase transformations in aluminum-chromium powder compacts during heating in the ambient air at 500°C. Samples were obtained by pressing from a mixture of the powders. The studies were carried out by using X-ray diffraction and metallographic analysis, and measuring the weight gain of the samples. It was found that silicon additives (10–20 at %) block the reaction interaction of aluminum and chromium, that occurred in two-component mixtures (Al-Cr) at 500°C and prevent a significant volume growth of the compacts.

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019, 2019

The structure and properties of the coatings obtained by vacuum-arc evaporation of the experiment... more The structure and properties of the coatings obtained by vacuum-arc evaporation of the experimental sintered cathodes of Ti-Al composition were studied for comparison with the conventionally used titanium and titaniumaluminum metallurgical cathodes. It was established that the coatings of the powder cathodes contain nanocrystalline components, have ultrahigh hardness and wear resistance, and have a low coefficient of friction against steel. The surface roughness of the coatings deposited by evaporation of the experimental powder cathodes is significantly less than that of coatings deposited during simultaneous separate evaporation of single-element titanium and aluminum cathodes.

2014 International Conference on Mechanical Engineering, Automation and Control Systems (MEACS), 2014

Composite powders “TiC - high-chromium iron binder” produced by self-propagating high temperature... more Composite powders “TiC - high-chromium iron binder” produced by self-propagating high temperature synthesis (SHS) from the reaction mixture of titanium, carbon and high chromium iron have been investigated. It was found that the content of the cast iron binder in the reaction mixtures affected the burning rate, combustion temperature and medium-grain size of carbide particles in structure of the composite powder.

Russian Journal of Non-Ferrous Metals, 2013

ABSTRACT Volume changes during solid-phase sintering and the structure and phase composition of m... more ABSTRACT Volume changes during solid-phase sintering and the structure and phase composition of materials sintered of the binary and ternary powder foundry alloys of the Al-Cr(Si,Ti) system are investigated. The powders for sintering were obtained by self-propagating high-temperature synthesis (SHS) in the mixtures of elementary powders of four target compositions with the subsequent crashing of the cakes and sieving of fine fractions. When sintering all the pressings under study, volume shrinkage, which monotonically increased with an temperature rise and the duration of the isothermal holding, take place. The results of structural investigations of the sintered materials, which were performed applying the methods of X-ray structural analysis, electron probe microanalysis, optical and scanning microscopy, are discussed jointly with the results of investigations of the volume variations during sintering.

Izvestiya vysshikh uchebnykh zavedenii. Fizika, 2021

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019, 2019

In this study, structural changes in aluminum-chromium powder compacts were considered during exp... more In this study, structural changes in aluminum-chromium powder compacts were considered during exposure in the air at 500 °C. The samples were obtained by pressing the mixture of aluminum and chromium powders. The studies were carried out with using the X-ray diffraction and the metallographic analysis and by measuring the weight gain of the samples. It was established that the value of the specific mass gain has a complex and ambiguous dependence on the initial porosity of Al-Cr compacts due to phase transformations in powder mixtures. At short-term (up to 30 minutes) 500 °C air heating of the porous compacts significant oxidation does not occur. However, at the long-term exposure at 500 °C the reaction diffusion between aluminum and chromium occurs resulting in Al 13 Cr 2 intermetallic formation and compacts swelling.

Key Engineering Materials, 2016

The paper presents the result of studies of composite powders produced by self-propagating high t... more The paper presents the result of studies of composite powders produced by self-propagating high temperature synthesis (SHS) in the reaction mixtures of titanium, carbon and high chrome cast iron, and electron-beam coatings based on them. It was found that the morphology and dispersion of titanium carbide particles in the SHS-product were determined by cast iron powder content in the reaction mixtures. The effect of content of the SHS powders on the characteristics of electron-beam coatings, including abrasive wear resistance of facing coatings was shown.

Technical Physics Letters, 1997

Abstract“Bioceramic-titanium nickelide” functional composites are proposed and investigated. It i... more Abstract“Bioceramic-titanium nickelide” functional composites are proposed and investigated. It is shown that the incorporation of an alloy (titanium nickelide) possessing superelasticity and shape memory enhances the strength properties of the composite while the porosity through the material needed for the ingrowth of living tissue is maintained. These composites are biocompatible and exhibit a property similar to the superelasticity characteristic of living tissue.

Powder Metallurgy and Metal Ceramics, 1997

Sintering conditions for the fabrication of high strength, porous, permeable, titanium—porous tit... more Sintering conditions for the fabrication of high strength, porous, permeable, titanium—porous titanium composites were determined. The structure and strength properties of porous permeable titanium after inward growth of bone tissue for periods of 1, 3, and 6 months were investigated. The minimum time necessary for the growth of bone tissue into an implant was determined.

Powder Metallurgy and Metal Ceramics, 2014

Brief review of kinetic regularities of Ti x C y-Ti composites synthesis

In the last decade, technologies associated with the formation of complex multilevel heterogeneou... more In the last decade, technologies associated with the formation of complex multilevel heterogeneous and heterophase structures in materials and structures have received intensive development. Studies show that such structures provide the most preferred functional properties. Multicomponent metal-matrix composites (MMC), which include refractory compounds such as carbides, silicides, borides, etc., cause the greatest interest. Their use provides high physicomechanical, chemical and tribological properties. Using different methods of obtaining the MMC from the same elements, it is possible to form a structure of a composite material with different characteristics. As a rule, powder mixtures of titanium, silicon, boron, and carbon are used as precursors of the metal-matrix composite. This can be either a mixture of elemental (monocomponent) powders, or a mixture with powders of ready-made refractory compounds. Among the technological processes of powder metallurgy, the self-propagating high-temperature synthesis (SHS) of multicomponent powder mixtures has received the widest use. As a result of SHS, a metal matrix structure can be formed with refractory solid phases formed directly in the synthesis process. The main condition in this case is the concentration of components, which provides exothermic reactions for the formation of simple or complex compounds (carbides, borides, silicides, intermetallic compounds) depending on the selected elemental composition of the powder mixture. Production of metal-matrix composites based on titanium-refractory element systems from among Si, C or B by traditional sintering from mixtures of elemental powders comes up against difficulties associated with large volume growth due to the formation of a rigid framework from their compounds accompanied by significant heat generation. In order to reduce volumetric growth and obtain an acceptable porosity of the sintered material, the powder of the second component can be replaced by the powder of its refractory compound TimAn, which will make it possible to go from uncontrolled liquid-phase sintering to solid-phase sintering. Additional interest in the presented materials is caused by the prospect of using them in additive technologies. In this case, a number of questions arise related to the behavior of metal matrix compositions under conditions of additional thermal processes (various types of surfacing, sintering, etc.), including the question of the stability or degree of transformation of a heterogeneous structure under such external influence. The use of hardening additives in mixtures of powders or the synthesis of metal matrix structure directly in the process of product formation face additional problems that can be associated with a number of physicochemical characteristics of materials (wettability, different melting points and coefficients of thermal expansion, etc.). The use of synthesized composite powders with an already formed structure instead of mechanical mixtures makes it possible to eliminate segregation (separation) of powder components. At the same time, the microstructure and phase composition of the composite powder upon thermal exposure during the fusion process may change significantly. From the point of view of the additive production of products and parts, the process of layer-by-layer melting or "sintering" of composite powder materials plays an important role. In connection with this, it is of interest to study the behavior of metal-matrix powder composites under vacuum sintering conditions for various combinations of components.

Coatings

Al-Cr and Al-Cr-Si composite cathodes were obtained by the hot compaction of aluminum, chromium, ... more Al-Cr and Al-Cr-Si composite cathodes were obtained by the hot compaction of aluminum, chromium, and silicon powder mixtures. The phase transformations in the surface layer of the Al-Cr-Si composite cathodes subjected to the arc heating were considered. The elemental and phase compositions of the modified cathodes’ surfaces were studied using X-ray diffraction, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The effect of the silicon addition on the structural evolution in the cathode surface during arc evaporation is shown. It was found that an arc impact on the cathode surface resulted in the melting and consequent crystallization of the multiphase mixture of intermetallic compounds and eutectic in the cathode surface layer. Cathode surface layers were found to be depleted of aluminum and silicon due to the ejection of these elements in drop form from the Al-Si liquid layer on the cathode surface. This can result in the change in the elements ra...

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE “PHYSICAL MESOMECHANICS. MATERIALS WITH MULTILEVEL HIERARCHICAL STRUCTURE AND INTELLIGENT MANUFACTURING TECHNOLOGY”

The studies of the structure, hardness and wear resistance of coatings obtained by electron-beam ... more The studies of the structure, hardness and wear resistance of coatings obtained by electron-beam surfacing of "titanium monoboride-titanium carbide-titanium binder" composite powders synthesized from mixtures of titanium boron and carbon in the wave combustion mode were carried out. The ratio effect of titanium borides and carbides on the structure, hardness and abrasive wear of electron-beam coatings based on the synthesized hybrid TiB-TiC-Ti powders was analyzed.

Metals, 2021

Aluminum matrix composites usually contain strengthening particles of refractory compounds (SiC, ... more Aluminum matrix composites usually contain strengthening particles of refractory compounds (SiC, Al2O3) that do not react with the Al matrix. There is a problem in producing the Al matrix composite with inclusion of metals that can generate intermetallic compounds with aluminum. In this case, a conventional sintering of powder mixtures results in high porosity due to volume growth. That is why some new methods of producing dense Al matrix composites are required. A possibility to create a dense powder Al-based composite containing hard components, such as chromium and silicon, without using the sintering process, is considered. This paper presents study results of structural and mechanical properties of Al-Cr and Al-Cr-Si composites produced by hot compaction of powder mixtures. An analysis of the relationship between mechanical properties and structures of Al-Cr and Al-Cr-Si composites is carried out. Optimal values for thermomechanical processing modes that ensure sufficient stren...

AIP Conference Proceedings, 2017

In this study, powder composite materials comprised of TiC and Ti with different ratios are proce... more In this study, powder composite materials comprised of TiC and Ti with different ratios are processed by sintering of Ti and C powder mixtures and self-propagating high-temperature synthesis (SHS) in “Ti+C” system followed by sintering. The microstructure and porosity of obtained composites are investigated and discussed. The dependence of porosity on sintering time is explained theoretically. Optimal regimes that enable to obtain the most homogeneous structure with the least porosity are described.In this study, powder composite materials comprised of TiC and Ti with different ratios are processed by sintering of Ti and C powder mixtures and self-propagating high-temperature synthesis (SHS) in “Ti+C” system followed by sintering. The microstructure and porosity of obtained composites are investigated and discussed. The dependence of porosity on sintering time is explained theoretically. Optimal regimes that enable to obtain the most homogeneous structure with the least porosity are described.