This is the preface article written for the special issue of Low Temperature Physics on the captivating topic of electron hydrodynamics dedicated to the pioneering work of Radii Gurzhi. The article features a brief synopsis of Gurzhi's seminal contributions that have played a pivotal role in shaping this continuously evolving area of condensed matter physics. This tribute is followed by a brief introduction to the collection of contributed papers published in the issue representing recent research in this dynamic field.
本文是为《低温物理学》（Low Temperature Physics）特刊撰写的序言文章，该特刊以电子流体力学为主题，专门介绍拉迪-古尔日（Radii Gurzhi）的开创性工作。文章简要概述了古尔日的开创性贡献，这些贡献对凝聚态物理学这一不断发展的领域的形成起到了关键作用。在致敬之余，文章还简要介绍了本期发表的论文集，这些论文代表了这一充满活力的领域的最新研究成果。
{"title":"Radii Gurzhi, who pioneered the field of electron hydrodynamics","authors":"A. N. Kalinenko, A. Levchenko","doi":"10.1063/10.0022359","DOIUrl":"https://doi.org/10.1063/10.0022359","url":null,"abstract":"This is the preface article written for the special issue of Low Temperature Physics on the captivating topic of electron hydrodynamics dedicated to the pioneering work of Radii Gurzhi. The article features a brief synopsis of Gurzhi's seminal contributions that have played a pivotal role in shaping this continuously evolving area of condensed matter physics. This tribute is followed by a brief introduction to the collection of contributed papers published in the issue representing recent research in this dynamic field.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"64 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139282648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Z. Trojanová, S. Daniš, K. Halmešová, J. Džugan, Z. Drozd, K. Máthis, P. Lukáč, R. Z. Valiev
Ti6Al4V alloy billets were additively manufactured by direct energy deposition and then equal channel angularly pressed (ECAPed) at 700 °C. The originally prepared α′ martensite microstructure was completely converted to an equiaxed fine grain structure during ECAP processing. The α′ martensite decomposed into α + β dual phase structure. The dislocation density in the deposited and ECAPed samples was measured by X-ray profile analysis in samples of two orientations. The dislocation density estimated in the deposition plane was found to be higher than that estimated perpendicularly. This difference is probably a consequence of the internal stresses generated in the samples during the deposition process. A similar anisotropy in dislocation density and crystallite size was found in the ECAPed samples. Lattice constants were measured for the α′ martensite and α phase of the ECAPed alloy. The crystallite size distribution was found to be moderately different for samples cut parallel and perpendicular to the extrusion direction.
{"title":"Impact of ECAP processing on dislocation density and subgrain size in a ti6al4V alloy prepared by direct energy deposition","authors":"Z. Trojanová, S. Daniš, K. Halmešová, J. Džugan, Z. Drozd, K. Máthis, P. Lukáč, R. Z. Valiev","doi":"10.1063/10.0021367","DOIUrl":"https://doi.org/10.1063/10.0021367","url":null,"abstract":"Ti6Al4V alloy billets were additively manufactured by direct energy deposition and then equal channel angularly pressed (ECAPed) at 700 °C. The originally prepared α′ martensite microstructure was completely converted to an equiaxed fine grain structure during ECAP processing. The α′ martensite decomposed into α + β dual phase structure. The dislocation density in the deposited and ECAPed samples was measured by X-ray profile analysis in samples of two orientations. The dislocation density estimated in the deposition plane was found to be higher than that estimated perpendicularly. This difference is probably a consequence of the internal stresses generated in the samples during the deposition process. A similar anisotropy in dislocation density and crystallite size was found in the ECAPed samples. Lattice constants were measured for the α′ martensite and α phase of the ECAPed alloy. The crystallite size distribution was found to be moderately different for samples cut parallel and perpendicular to the extrusion direction.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"23 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135515870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The interest in RBa2Cu3O7–δ (R = lanthanides) stems from its superconducting properties. These represent a very significant advance in solid-state materials physics and have been extensively studied for decades, with the aim of increasing the critical temperature by doping or external parameters such as pressure. In the present review, we briefly discuss oxygen diffusion in RBa2Cu3O7–δ with respect to its composition. We consider related compounds as a comparison.
{"title":"Oxygen diffusion in RBa2Cu3O7−δ superconductors: A brief review","authors":"I. L. Goulatis, R. V. Vovk, A. I. Chroneos","doi":"10.1063/10.0021373","DOIUrl":"https://doi.org/10.1063/10.0021373","url":null,"abstract":"The interest in RBa2Cu3O7–δ (R = lanthanides) stems from its superconducting properties. These represent a very significant advance in solid-state materials physics and have been extensively studied for decades, with the aim of increasing the critical temperature by doping or external parameters such as pressure. In the present review, we briefly discuss oxygen diffusion in RBa2Cu3O7–δ with respect to its composition. We consider related compounds as a comparison.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"21 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135515877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. D. Tabachnikova, T. V. Hryhorova, S. N. Smirnov, I. V. Kolodiy, Yu. O. Shapovalov, A. V. Levenets, S. E. Shumilin, I. V. Kashuba, M. A. Tikhonovsky, F. Spieckermann, M. J. Zehetbauer, E. Schafler, Y. Huang, T. G. Langdon
The work is devoted to a study of the structure and mechanical properties of two nonequiatomic medium-entropy nanocrystalline alloys, in which in a coarse state additional mechanisms act during plastic deformation — twinning (TWIP) in the Fe40Mn40Co10Cr10 alloy and phase transformations (TRIP) in the Fe50Mn30Co10Cr10 alloy. The nanocrystalline state in these alloys is achieved by high-pressure torsion (HPT) at 300 K and 77 K after different numbers of revolutions n = 0.25 and 5. In the nanostructural state in the TWIP Fe40Mn40Co10Cr10 and the TRIP Fe50Mn30Co10Cr10 alloys, a basically complete phase transition from the fcc lattice to hcp is observed, the content of which does not depend very strongly on the HPT temperature and deformation. For both alloys in the nanostructured state, there is a significant decrease in differences in the phase composition and microhardness Hv by comparison with the coarse-grained state. A decrease in the HPT temperature and an increase in HPT deformation for all the cases studied lead to an increase in the value of Hv. The Fe40Mn40Co10Cr10 TWIP alloy remains ductile under active compression deformation at 300 and 77 K, while there is no macroscopic plasticity in the Fe50Mn30Co10Cr10 TRIP alloy under similar conditions. For the Fe40Mn40Co10Cr10 TWIP the thermally-activated character of plastic deformation is retained during the transition from the coarse-grained to the nanostructured state.
{"title":"Structure and cryogenic mechanical properties of severely deformed nonequiatomic alloys of Fe–Mn–Co–Cr system","authors":"E. D. Tabachnikova, T. V. Hryhorova, S. N. Smirnov, I. V. Kolodiy, Yu. O. Shapovalov, A. V. Levenets, S. E. Shumilin, I. V. Kashuba, M. A. Tikhonovsky, F. Spieckermann, M. J. Zehetbauer, E. Schafler, Y. Huang, T. G. Langdon","doi":"10.1063/10.0021377","DOIUrl":"https://doi.org/10.1063/10.0021377","url":null,"abstract":"The work is devoted to a study of the structure and mechanical properties of two nonequiatomic medium-entropy nanocrystalline alloys, in which in a coarse state additional mechanisms act during plastic deformation — twinning (TWIP) in the Fe40Mn40Co10Cr10 alloy and phase transformations (TRIP) in the Fe50Mn30Co10Cr10 alloy. The nanocrystalline state in these alloys is achieved by high-pressure torsion (HPT) at 300 K and 77 K after different numbers of revolutions n = 0.25 and 5. In the nanostructural state in the TWIP Fe40Mn40Co10Cr10 and the TRIP Fe50Mn30Co10Cr10 alloys, a basically complete phase transition from the fcc lattice to hcp is observed, the content of which does not depend very strongly on the HPT temperature and deformation. For both alloys in the nanostructured state, there is a significant decrease in differences in the phase composition and microhardness Hv by comparison with the coarse-grained state. A decrease in the HPT temperature and an increase in HPT deformation for all the cases studied lead to an increase in the value of Hv. The Fe40Mn40Co10Cr10 TWIP alloy remains ductile under active compression deformation at 300 and 77 K, while there is no macroscopic plasticity in the Fe50Mn30Co10Cr10 TRIP alloy under similar conditions. For the Fe40Mn40Co10Cr10 TWIP the thermally-activated character of plastic deformation is retained during the transition from the coarse-grained to the nanostructured state.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"22 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135515875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An evident coupling between acoustic (AE) and electromagnetic (EME) emissions has been proved experimentally during plastic deformation of LiF ionic monocrystals under uniaxial compression with simultaneous recording of both AE and EME. The strong correlation between AE and EME demonstrate clearly that the observed EME is caused by dynamical dislocations and charged vacancies in the ionic lattice during work hardening. The theoretical interpretation proposed to explain the observable EME is based on the well-known Stepanov effect that means sweeping-up the charged vacancies of a preferable sign by gliding edge dislocations and formation of charged Cottrell clouds. During work hardening dislocation pile-ups are formed, and a certain nonequilibrium charge density is accumulated at their heads, resulting to the dynamic electric polarization of the deformed crystal. As the external loading increases, a locked dislocation pile-up bursts through the stoppers and quickly loses its bound charge. The relaxation of this charge produces intrinsic polarization currents generating electric pulses strongly correlated with dynamic dislocation process during plastic deformation. To build the theoretical model, it is assumed that the relaxation current can be described as an athermic viscous motion of vacancies under the kinetic friction force ∼Bυ (B is the friction coefficient and υ is the vacancy velocity) in a self-consistent electric field determined by the distribution of the total charge density. The electrical signal generated by an acting slip system has been calculated. By comparing the calculated and experimentally measured electric signal patterns, the friction coefficient for the linear chain of vacancies (the analogue of an edge dislocation extra-plane) in LiF has been estimated to be B≃ 0.9⋅10–5 g cm–1⋅s–1. This value is in accordance with the corresponding coefficient for dislocations in ionic lattices.
实验证明了在单轴压缩下锂离子单晶塑性变形过程中声发射和电磁发射之间存在明显的耦合，同时记录了声发射和电磁发射。声发射和电磁之间的强相关性清楚地表明，所观察到的电磁是由加工硬化过程中离子晶格中的动态位错和带电空位引起的。提出的理论解释是基于著名的Stepanov效应，这意味着通过滑动边缘位错和带电Cottrell云的形成来扫除有利标志的带电空位。在加工硬化过程中形成位错堆积，并在其头部积聚一定的非平衡电荷密度，导致变形晶体的动态电极化。随着外部载荷的增加，锁定的位错堆积冲破阻器并迅速失去束缚电荷。这种电荷的弛豫产生本征极化电流，产生与塑性变形过程中动态位错过程强烈相关的电脉冲。为了建立理论模型，假设弛豫电流可以描述为空位在由总电荷密度分布决定的自一致电场中在动摩擦力~ Bυ (B为摩擦系数，υ为空位速度)作用下的热粘性运动。对作用滑移系统产生的电信号进行了计算。通过对比计算结果和实验结果，推测LiF中线性空位链(类似于边缘位错的超平面)的摩擦系数为B⋅10-5 g cm-1⋅s-1。这个值与离子晶格中位错的相应系数是一致的。
{"title":"Unambiguous coupling between acoustic and electromagnetic emissions in plastically deformed crystals","authors":"K. A. Chishko","doi":"10.1063/10.0021362","DOIUrl":"https://doi.org/10.1063/10.0021362","url":null,"abstract":"An evident coupling between acoustic (AE) and electromagnetic (EME) emissions has been proved experimentally during plastic deformation of LiF ionic monocrystals under uniaxial compression with simultaneous recording of both AE and EME. The strong correlation between AE and EME demonstrate clearly that the observed EME is caused by dynamical dislocations and charged vacancies in the ionic lattice during work hardening. The theoretical interpretation proposed to explain the observable EME is based on the well-known Stepanov effect that means sweeping-up the charged vacancies of a preferable sign by gliding edge dislocations and formation of charged Cottrell clouds. During work hardening dislocation pile-ups are formed, and a certain nonequilibrium charge density is accumulated at their heads, resulting to the dynamic electric polarization of the deformed crystal. As the external loading increases, a locked dislocation pile-up bursts through the stoppers and quickly loses its bound charge. The relaxation of this charge produces intrinsic polarization currents generating electric pulses strongly correlated with dynamic dislocation process during plastic deformation. To build the theoretical model, it is assumed that the relaxation current can be described as an athermic viscous motion of vacancies under the kinetic friction force ∼Bυ (B is the friction coefficient and υ is the vacancy velocity) in a self-consistent electric field determined by the distribution of the total charge density. The electrical signal generated by an acting slip system has been calculated. By comparing the calculated and experimentally measured electric signal patterns, the friction coefficient for the linear chain of vacancies (the analogue of an edge dislocation extra-plane) in LiF has been estimated to be B≃ 0.9⋅10–5 g cm–1⋅s–1. This value is in accordance with the corresponding coefficient for dislocations in ionic lattices.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"27 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135564939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. V. Rusakova, L. S. Fomenko, S. V. Lubenets, V. D. Natsik, A. V. Dolbin, N. A. Vinnikov, R. M. Basnukaeva, S. V. Cherednichenko, A. V. Blyznyuk
The effect of small impurities of reduced graphene oxide (rGO) on microhardness of polyethylene (PЕ) and polypropylene (PP) matrices and the reaction of these nanocomposites and initial polymers on the influence of localized load in the temperature range of 77–295 K were studied. When rGO was introduced, PE practically did not change its properties, whereas the introduction of 0.3 wt% rGO into the PP matrix was accompanied by a significant increase in microhardness, especially in the room temperature range (by approximately 70%). A transition to reversible deformation was detected when the indenter impressions applied in liquid and gaseous nitrogen at temperatures below the threshold (T < 174.5 K for PP and T < 226.5 K for nanocomposite PP + 0.3 wt% rGO) were not fixed on the surface of the samples after their heating in the measuring device to room temperature.
{"title":"Low-temperature micromechanical properties of polyolephin/graphene oxide nanocomposites with low weight percent filler","authors":"H. V. Rusakova, L. S. Fomenko, S. V. Lubenets, V. D. Natsik, A. V. Dolbin, N. A. Vinnikov, R. M. Basnukaeva, S. V. Cherednichenko, A. V. Blyznyuk","doi":"10.1063/10.0021363","DOIUrl":"https://doi.org/10.1063/10.0021363","url":null,"abstract":"The effect of small impurities of reduced graphene oxide (rGO) on microhardness of polyethylene (PЕ) and polypropylene (PP) matrices and the reaction of these nanocomposites and initial polymers on the influence of localized load in the temperature range of 77–295 K were studied. When rGO was introduced, PE practically did not change its properties, whereas the introduction of 0.3 wt% rGO into the PP matrix was accompanied by a significant increase in microhardness, especially in the room temperature range (by approximately 70%). A transition to reversible deformation was detected when the indenter impressions applied in liquid and gaseous nitrogen at temperatures below the threshold (T &lt; 174.5 K for PP and T &lt; 226.5 K for nanocomposite PP + 0.3 wt% rGO) were not fixed on the surface of the samples after their heating in the measuring device to room temperature.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"32 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135565043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
One of the important problems of the modern rheology of polymer materials, namely, the possibility of describing the deformation of amorphous polymers within the framework of linear rheological relationships between relative deformation and deforming stress or the need to use nonlinear rheological equations is considered. The criteria for distinguishing these approaches, namely, the determination of the corresponding critical values of the macro- and microphysical characteristics of the material and the conditions for carrying out the mechanical tests are also discussed. In particular, the difference between the influence of kinetic and thermodynamic nonlinear effects on the regularities of deformation processes of amorphous polymers in warm and frozen states was noted. The influence of nonlinear effects on the general shape and characteristics of individual stages of the “relative strain - deforming stress” diagram at deformation of polymer samples with specified values of strain rate and temperature is analyzed in detail. The results of the theoretical analysis were used for the physical interpretation of the general form and features of individual stages of the tensile test diagrams of amorphous polyimide films (V. D. Natsik, H. V. Rusakova, S. V. Lubenets, V. A. Lototskaya, and L. F. Yakovenko, Fiz. Nyzk. Temp. 49, 569 (2023) [Low Temp. Phys. 49, 521 (2023)]), empirical estimates for the rheological characteristics of this polymer were obtained.
考虑了现代高分子材料流变学的一个重要问题，即在相对变形与变形应力之间的线性流变关系框架内描述非晶聚合物变形的可能性或使用非线性流变方程的必要性。还讨论了区分这些方法的标准，即确定材料的宏观和微观物理特性的相应临界值以及进行力学试验的条件。特别指出了动力学和热力学非线性效应对非晶聚合物在温暖和冷冻状态下变形过程规律的影响的区别。详细分析了在一定应变速率和温度条件下，非线性效应对聚合物试样变形时“相对应变-变形应力”图的总体形状和各阶段特征的影响。理论分析的结果被用于对非晶聚酰亚胺薄膜拉伸试验图的一般形式和各个阶段的特征的物理解释(V. D. Natsik, H. V. Rusakova, S. V. Lubenets, V. A. Lototskaya和L. F. Yakovenko, Fiz)。Nyzk。温度。49,569(2023)[低温。物理。49,521(2023)])，获得了该聚合物流变特性的经验估计。
{"title":"Nonlinear effects at the deformation of amorphous polymers in warm and frozen states","authors":"V. D. Natsik, H. V. Rusakova","doi":"10.1063/10.0021378","DOIUrl":"https://doi.org/10.1063/10.0021378","url":null,"abstract":"One of the important problems of the modern rheology of polymer materials, namely, the possibility of describing the deformation of amorphous polymers within the framework of linear rheological relationships between relative deformation and deforming stress or the need to use nonlinear rheological equations is considered. The criteria for distinguishing these approaches, namely, the determination of the corresponding critical values of the macro- and microphysical characteristics of the material and the conditions for carrying out the mechanical tests are also discussed. In particular, the difference between the influence of kinetic and thermodynamic nonlinear effects on the regularities of deformation processes of amorphous polymers in warm and frozen states was noted. The influence of nonlinear effects on the general shape and characteristics of individual stages of the “relative strain - deforming stress” diagram at deformation of polymer samples with specified values of strain rate and temperature is analyzed in detail. The results of the theoretical analysis were used for the physical interpretation of the general form and features of individual stages of the tensile test diagrams of amorphous polyimide films (V. D. Natsik, H. V. Rusakova, S. V. Lubenets, V. A. Lototskaya, and L. F. Yakovenko, Fiz. Nyzk. Temp. 49, 569 (2023) [Low Temp. Phys. 49, 521 (2023)]), empirical estimates for the rheological characteristics of this polymer were obtained.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135515872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. A. Moskalenko, A. R. Smirnov, R. V. Smolianets, Yu. M. Pohribna
The paper considers the influence of a heterogeneous (bimodal) grain structure on the ductility characteristics of commercial purity titanium in a wide range of low temperatures (4.2–395 K) as a strategy for optimizing mechanical properties within the framework of the “strength–plasticity” ratio. Using titanium as an example, the physical mechanism for increasing the low-temperature ductility of hcp nanocrystalline metals with a heterogeneous grain size distribution is explained by a combination of several processes: an increase in the activity of intragrain dislocation slip, dynamic grain growth under tensile stresses, and activation of nanotwinning in submicron-sized grains.
{"title":"Creation of a heterogeneous grain structure is a condition for increasing the low-temperature ductility of nanocrystalline hcp metals","authors":"V. A. Moskalenko, A. R. Smirnov, R. V. Smolianets, Yu. M. Pohribna","doi":"10.1063/10.0021369","DOIUrl":"https://doi.org/10.1063/10.0021369","url":null,"abstract":"The paper considers the influence of a heterogeneous (bimodal) grain structure on the ductility characteristics of commercial purity titanium in a wide range of low temperatures (4.2–395 K) as a strategy for optimizing mechanical properties within the framework of the “strength–plasticity” ratio. Using titanium as an example, the physical mechanism for increasing the low-temperature ductility of hcp nanocrystalline metals with a heterogeneous grain size distribution is explained by a combination of several processes: an increase in the activity of intragrain dislocation slip, dynamic grain growth under tensile stresses, and activation of nanotwinning in submicron-sized grains.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"21 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135515878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The criterion of formation of a modulated structure by means of the spinodal mechanism in a spatial distribution of interacting vacancies (as strong concentrators of mechanical stresses) in metals as a target after irradiation is analyzed. For the irradiated body-centered cubic vanadium and tungsten, temperature dependences of the spatial periods of such a structure of the substitutional-vacancies’ subsystem are predicted taking into account the total mixing energies consisting of the energies of the (electro)chemical and strain-induced interactions between vacancies, which are cohesive by the nature in short distances and elastic by character at long distances, respectively.
{"title":"Modulated distribution of vacancies within the post-irradiated bcc metals","authors":"O. V. Oliinyk, V. A. Tatarenko","doi":"10.1063/10.0021366","DOIUrl":"https://doi.org/10.1063/10.0021366","url":null,"abstract":"The criterion of formation of a modulated structure by means of the spinodal mechanism in a spatial distribution of interacting vacancies (as strong concentrators of mechanical stresses) in metals as a target after irradiation is analyzed. For the irradiated body-centered cubic vanadium and tungsten, temperature dependences of the spatial periods of such a structure of the substitutional-vacancies’ subsystem are predicted taking into account the total mixing energies consisting of the energies of the (electro)chemical and strain-induced interactions between vacancies, which are cohesive by the nature in short distances and elastic by character at long distances, respectively.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"32 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135565046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. P. Nerubatskyi, E. S. Gevorkyan, R. V. Vovk, Z. Krzysiak, Z. F. Nazyrov, O. M. Morozova, D. A. Hordiienko
The work presents the results of the creation of consolidated nanomaterials and composite ceramics using modern methods of consolidation of ceramic materials for the synthesis of powder precursors and specified phases that self-reinforce ceramic matrices. The method of mechanosynthesis and electroconsolidation is used. The results of the use of these trends for the creation of promising composite materials are given. The use of mechanochemical synthesis of β-SiC nanoparticles in nanoreactors, involving the organic-inorganic complex (–CH3)–(SiO2)n and the modification of refractory filler powders and carbon bonds using silicon alkoxide and related gels, has been demonstrated to enable the production of composite materials. These materials are composed of SiC, WC, and ZrO2, exhibiting a minimum bending strength of 650 MPa and crack resistance ranging from 6.5–7.9 MPa m0.5. Furthermore, this method can also produce periclase-carbon materials known for their exceptional resistance to oxidation and slag.
{"title":"Peculiarities of obtaining nanocomposites with organic additives and consolidated nanomaterials with given properties","authors":"V. P. Nerubatskyi, E. S. Gevorkyan, R. V. Vovk, Z. Krzysiak, Z. F. Nazyrov, O. M. Morozova, D. A. Hordiienko","doi":"10.1063/10.0021375","DOIUrl":"https://doi.org/10.1063/10.0021375","url":null,"abstract":"The work presents the results of the creation of consolidated nanomaterials and composite ceramics using modern methods of consolidation of ceramic materials for the synthesis of powder precursors and specified phases that self-reinforce ceramic matrices. The method of mechanosynthesis and electroconsolidation is used. The results of the use of these trends for the creation of promising composite materials are given. The use of mechanochemical synthesis of β-SiC nanoparticles in nanoreactors, involving the organic-inorganic complex (–CH3)–(SiO2)n and the modification of refractory filler powders and carbon bonds using silicon alkoxide and related gels, has been demonstrated to enable the production of composite materials. These materials are composed of SiC, WC, and ZrO2, exhibiting a minimum bending strength of 650 MPa and crack resistance ranging from 6.5–7.9 MPa m0.5. Furthermore, this method can also produce periclase-carbon materials known for their exceptional resistance to oxidation and slag.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135515876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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