Technical Physics Letters最新文献

{"title":"Structural Change in Co–Cr–Fe–Mn–Ni Alloys upon Variation in Mn and Fe Concentrations","authors":"I. A. Panchenko,&nbsp;V. K. Drobyshev,&nbsp;S. V. Konovalov,&nbsp;D. A. Bessonov","doi":"10.1134/S1063785024700391","DOIUrl":"10.1134/S1063785024700391","url":null,"abstract":"<p>Co–Cr–Fe–Mn–Ni alloys with a change in the manganese and iron concentrations from 5 to 35 at % providing the optimum ratio between the strength and ductility have been investigated. Using a comprehensive study of the structure and mechanical properties of the samples, data on the effect of the elemental composition on the micro- and nanohardness of the Co–Cr–Fe–Mn–Ni alloys have been obtained and an optimum Mn-to-Fe ratio ensuring high strength has been determined. The structure and the phase and chemical compositions of the materials have been examined by X-ray diffraction analysis and scanning electron microscopy.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 3","pages":"282 - 287"},"PeriodicalIF":0.8,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549470","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}

{"title":"Effect of an External Electric Field on the Intracenter Optical Transitions in Quasi-Zero-Dimensional Semiconductor Structures","authors":"V. D. Krevchik,&nbsp;A. V. Razumov,&nbsp;M. B. Semenov","doi":"10.1134/S106378502470041X","DOIUrl":"10.1134/S106378502470041X","url":null,"abstract":"<p>The development of the double selective doping technique has stimulated interest in the optical properties of semiconductor nanostructures containing the <i>H</i>^<i>‒</i>-similar impurity centers and their molecular complexes. Interest in the optical properties of quantum dots with the <span>(D_{2}^{ - })</span> centers in an electric field is due, first of all, to the possibility of effective control of both the binding energy of impurity states and the photoexcitation spectra of molecular impurities. Depending on the quantum dot radius and the spatial configuration of impurity molecules, the <span>(D_{2}^{ - })</span> photoexcitation band can be in the visible, IR, or terahertz frequency range, which significantly expands the range of instrumental applications of quantum dots with impurity states. Therefore, great interest is presented by quasi-zero-dimensional structures with the <span>(D_{2}^{ - })</span> impurity states, which can be used to create IR and terahertz receivers. The aim of this study is to theoretically investigate the features of the spectra of intracenter optical transitions in quasi-zero-dimensional structures with the <span>(D_{2}^{ - })</span> centers in an electric field. The binding energy of the <span>(D_{2}^{ - })</span> states has been calculated by the zero-radius potential method in the effective mass approximation. The expression for the coefficient of impurity absorption of light has been obtained in the dipole approximation within the perturbation theory. It has been shown that the violation of symmetry in the arrangement of the <span>({{D}^{0}})</span> centers leads to the removal of degeneracy between the g and u terms. It is shown that an external electric field leads to a decrease in the splitting between the g- and u-terms. It has been established that the photoexcitation spectrum is a band the position of which depends on the external electric-field strength. The quasi-zero-dimensional structures with the <span>(D_{2}^{ - })</span> centers in an external electric field can be used to create IR and terahertz detectors with controllable characteristics.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 3","pages":"302 - 313"},"PeriodicalIF":0.8,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549337","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}

{"title":"The Effect of the Structure of an Electric Double Layer on the Stability of Bulk Nanobubbles","authors":"S. I. Koshoridze","doi":"10.1134/S1063785024700299","DOIUrl":"10.1134/S1063785024700299","url":null,"abstract":"<p>The electrostatic stabilization of bulk nanobubbles is investigated taking into account the structure of a double layer consisting of diffusion and Stern regions, with the permittivity of the latter being significantly lower than that of the former. It is shown that a narrow hydrated Stern layer significantly increases the negative electrostatic pressure and, at certain values of the surface charge, can compensate for the huge compressive Laplace pressure by preventing the diffusion dissolution of bulk nanobubbles.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 1","pages":"55 - 57"},"PeriodicalIF":0.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141252932","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}

{"title":"Increasing the Fatigue Life of VT1-0 Titanium under the Influence of a Constant Magnetic Field","authors":"K. V. Aksenova,&nbsp;V. V. Shlyarov,&nbsp;D. V. Zagulyaev,&nbsp;Yu. F. Ivanov,&nbsp;H. M. Mohan","doi":"10.1134/S1063785024700202","DOIUrl":"10.1134/S1063785024700202","url":null,"abstract":"<p>High-cycle fatigue tests of VT1-0 titanium samples were carried out under conditions of exposure to a constant magnetic field of various magnitudes and without it. It is shown that the use of a constant magnetic field with induction <i>B</i> = 0.3, 0.4, and 0.5 T leads to a multiple increase in the average number of cycles before the destruction of titanium samples VT1-0 by 64, 123, and 163%, respectively. Using scanning electron microscopy, it was found that the structure of a sample destroyed under fatigue testing conditions, regardless of the test mode, has three characteristic zones: a fatigue crack growth zone, an accelerated crack growth zone, and a fracture zone. It was found that the width of the fatigue crack growth zone depends on the magnetic field induction and reaches its maximum values (<i>h</i> = 264 μm) at <i>B</i> = 0.4 T, and during fatigue tests without a magnetic field, <i>h</i> = 182 μm. This indicates an increase in the critical crack length (the width of the fatigue crack growth zone) by a factor of 1.45. It is shown that the average distance between fatigue striations in titanium samples depends on the value of the magnetic induction of the magnetic field and decreases from 0.78 μm in the absence of a field to 0.49 μm at <i>B</i> = 0.5 T. The formation of a subgrain (fragmented) structure in the zone of fatigue crack growth in a titanium sample was established. The subgrain sizes correspond to the distance between the fatigue striations, which has a retarding effect on the movement of a microcrack. Taken together, the revealed facts indicate a higher resistance of the material to the propagation of a fatigue crack and an increase in its service life during fatigue tests in a magnetic field.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 1","pages":"13 - 18"},"PeriodicalIF":0.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141252667","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}

{"title":"Solution of a Scalar Two-Dimensional Nonlinear Problem of Diffraction on Objects of Arbitrary Shape","authors":"A. O. Lapich,&nbsp;M. Yu. Medvedik","doi":"10.1134/S1063785024700196","DOIUrl":"10.1134/S1063785024700196","url":null,"abstract":"<p>The aim of this study is to develop, construct, and implement methods for solving a nonlinear diffraction problem. The effect of a nonlinear medium specified by the Kerr law <span>({{k}^{2}}(x) = k_{1}^{2} + alpha {{left| {u(x)} right|}^{2}})</span> on the propagation of a wave through an object is examined. The differential and integral forms of the problem and the nonlinear integral equation are presented. The problem is solved on different bodies using different computational grids, and plots of convergence of iterative processes and graphical results are presented. Explicit and implicit methods for solving the integral equation are compared.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 1","pages":"6 - 12"},"PeriodicalIF":0.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141252473","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}

{"title":"Investigation of Effect of the State of the Deformation Zones on the Structure of Pure-Iron Samples after Surface Plastic Deformation by a Multiradius Roller","authors":"V. Yu. Blumenstein,&nbsp;K. S. Mitrofanova","doi":"10.1134/S1063785024700214","DOIUrl":"10.1134/S1063785024700214","url":null,"abstract":"<p>The article describes the peculiarities of the formation of the geometry of the deformation zones and the structure of samples made of pure-iron in surface plastic deformation (SPD) by a multiradius roller (MR-roller). The SPD MR-roller leads to a complex kinematic introduction of a deforming tool into the surface layer of a blank and the appearance of a deformation hearth of a curvilinear shape. The results of X-ray structural analysis of pure-iron are presented. It is shown that processing of SPD MR-roller with maximum force results in a significant increase in the microdistortion of the crystal grid, which is characteristic of the nanoscale structure.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 1","pages":"19 - 24"},"PeriodicalIF":0.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141252543","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}

{"title":"Fe–Cr–Al Alloy Development Via Wire-Feed Additive Manufacturing Technology","authors":"Yanhu Wang,&nbsp;Xizhang Chen,&nbsp;S. Konovalov","doi":"10.1134/S1063785024700287","DOIUrl":"10.1134/S1063785024700287","url":null,"abstract":"<p>A new wire-arc additive manufacturing (WAAM) based on Cold Metal Transfer (CMT) welding process is used to fabricate iron-chromium-aluminum (Fe–Cr–Al) alloy by simultaneously feeding two separate wires. A wall of Fe–Cr–Al containing approximately 4.2% Al and 6.5% Cr was deposited over a steel substrate. Chemical composition test performed on the deposited alloy indicated a uniform material distribution of element throughout the deposited wall. It was also found that an increase in Al content or decrease in Cr content improved the hardness of the Fe–Cr–Al alloy. A macro and microstructural characterization revealed that the top region of the wall contained equiaxed grains, whereas columnar grain in the middle region and some acicular precipitates of Fe₃AlC_0.5 phase at the bottom were observed. The phases at different locations within the built wall were very different, especially, in the top section and bottom section. In the top and middle sections Fe₃C carbide were found. The Cr₃C₂ carbides were found in the top section. No (Cr,Fe)_<i>x</i>C_<i>y</i> carbides were found at the bottom of the buildup wall. A comparison of bottom and top sections indicated that the (Fe,Cr)_<i>x</i>C_<i>y</i> carbides have the ability to prevent cracks from occurring.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 1","pages":"48 - 54"},"PeriodicalIF":0.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141252637","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}

{"title":"Gas-Dynamic Influence upon the Properties and Geometry of Single-Rim Welds Made of 30ХГСА Steel When Welding under a Double-Jet Gas Shield","authors":"D. A. Chinakhov","doi":"10.1134/S1063785024700329","DOIUrl":"10.1134/S1063785024700329","url":null,"abstract":"<p>The authors have considered the gas-dynamic influence upon the mechanical properties, chemical composition, microhardness, and geometry of single-rim welds made of 30ХГСА steel when welding with a consumable electrode under a double-jet gas shield. Their regressional relationships on the selected controlled welding parameters have been developed. It has been found that the gas-dynamic effect of a dynamic shield gas jet has a controlling influence on the formation of welds made of alloy-treated 30ХГСА steel.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 1","pages":"67 - 74"},"PeriodicalIF":0.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141252669","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}

{"title":"Research of the Corrosive Effect of Coolant on the Internal Combustion Engines of Gas-Diesel Mining Dump Trucks","authors":"G. Dubov,&nbsp;A. Bogomolov,&nbsp;A. Chernichenko,&nbsp;S. Nokhrin","doi":"10.1134/S1063785024700251","DOIUrl":"10.1134/S1063785024700251","url":null,"abstract":"<p>The results of the study of the effect of low concentration of anti-corrosion additives in the coolant on corrosion, scaling and pitting of cooling jackets of the cylinder block of the internal combustion engines of the gas-diesel mining dump trucks are presented. The negative influence of the presence of coolant in the engine oil system has been studied. It is argued that even an insignificant concentration of coolant in the engine oil leads to cavitation with the concomitant occurrence of caverns or significant and deep pits—pockmarks—on especially stressed parts of the engine (crank-connecting rod liners, camshaft bushings). The conducted studies allow concluding that the coolant, in the presence of an insufficient concentration of anti-corrosion additives in it, as well as when it penetrates the oil system, has a sufficiently significant effect on the wear and destruction of the surface layer of the internal combustion engine parts.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 1","pages":"30 - 36"},"PeriodicalIF":0.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141252355","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}

{"title":"Estimation of the Efficiency of Applying Nitrogen Powder Materials in Magnetic Abrasive Processing Technology","authors":"G. Petrishin,&nbsp;F. Panteleenko,&nbsp;V. Blumenstein,&nbsp;F. Switala,&nbsp;E. Panteleenko","doi":"10.1134/S1063785024700263","DOIUrl":"10.1134/S1063785024700263","url":null,"abstract":"<p>The article evaluates the efficiency of applying new diffusion-nitrided ferromagnetic abrasive materials in the technology of magnetic abrasive processing. In this work, the efficiency of processing and the attainable roughness of the processed surface are selected as efficiency criteria. The proposed new powder materials are manufactured by nitriding dispersed metal waste based on 16MnCr5 steel and provide an increase in the productivity of magnetic abrasive processing, an effective decrease in the roughness of the processed surface, and the achievement of a roughness Ra of 0.16 μm. The tests of new nitrided powder materials based on metal waste were carried out in comparison with the most common sintered powder material Fe–TiC.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 1","pages":"37 - 41"},"PeriodicalIF":0.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141252388","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}