Physical Mesomechanics最新文献

{"title":"Numerical Modeling of Structural and Spectral Changes in a Textured Silicon Wafer after Shock Compression","authors":"E. Kh. Khamzin,&nbsp;S. A. Nefedov,&nbsp;A. S. Panin,&nbsp;D. N. Artemyev,&nbsp;E. Yu. Tarasova","doi":"10.1134/S1029959925601216","DOIUrl":"10.1134/S1029959925601216","url":null,"abstract":"<p>This study investigates structural and spectral changes in a single–crystalline silicon plate subjected to mild laser–induced shock–wave compression. X-ray diffraction and Raman spectra of silicon in the initial and post–shock states are analyzed experimentally. To interpret the experimental results, numerical simulations of the shock loading process and subsequent relaxation of the atomic structure are performed using classical molecular dynamics with the Tersoff interatomic potential, as well as a simplified finite element model employed to estimate the macroscopic loading parameters. A range of moderate shock pressures on the order of one gigapascal is considered, for which the fraction of irreversibly rearranged atoms remains below one percent. Analysis of coordination characteristics and radial distribution functions reveals no evidence of phase transformations, but indicates the development of non–affine deformation of the crystalline lattice. Examination of bond angle distributions demonstrates local distortions of the tetrahedral configuration characteristic of silicon, accompanied by an increased angular spread and the formation of irreversible local rearrangements corresponding to plastic deformation. Shock–induced local restructuring of the atomic configuration, breaking of centrosymmetry, and the emergence of residual elastic stresses result in observable peak shifts in the X-ray diffraction and Raman spectra in the post–shock state. It is shown that the employed numerical approach provides an adequate atomistic description of post–shock structural relaxation in silicon and the associated spectral changes, thereby bridging the gap between experiment and theory and may be useful for applications in laser processing and micro- and nanoelectronics.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"29 5","pages":"909 - 921"},"PeriodicalIF":2.2,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deformation Behavior of an Al-Ce-Fe-Ni-Zr Alloy Fabricated by L-PBF","authors":"K. O. Bazaleeva,&nbsp;Yu. Yu. Ponkratova,&nbsp;S. A. Kunavin,&nbsp;D. N. Khmelenin,&nbsp;I. I. Binkov,&nbsp;K. A. Nikolaev","doi":"10.1134/S1029959926600102","DOIUrl":"10.1134/S1029959926600102","url":null,"abstract":"<p>The mechanical properties of a heat-resistant aluminum alloy Al-5.5%Ce-5.8%Fe-1.1%Ni-0.7%Zr fabricated by L-PBF were investigated under static and cyclic loading, considering the influence of build orientation and surface condition of the specimens. Moreover, deformation-induced microstructural changes in the alloy were analyzed. It was established that surface machining has little effect on the alloy’s strength but enhances its ductility, fatigue strength, and fatigue. The build orientation was found to affect ductility—samples fabricated in the horizontal direction exhibited approximately twice the plasticity compared to those built vertically, while strength characteristics and fatigue life remained nearly unchanged. During deformation, the following structural changes were observed: a pore-enriched zone formed near the fracture surface; the melt pools were elongated along the direction of the applied load; fine intermetallic inclusions of Al₉FeNi, Al₄Ce, and Al₃Zr phases formed during L-PBF partially dissolved in the solid solution; the lattice parameter of the aluminum solid solution decreased, presumably due to the dissolution of Ni and Fe atoms; and the broadening of diffraction peaks of the aluminum solid solution increased.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"29 5","pages":"931 - 943"},"PeriodicalIF":2.2,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Spall Strength of the Polytetrafluoroethylene Irradiated above the Melting Point","authors":"A. V. Khokhlov,&nbsp;S. А. Khatipov,&nbsp;A. S. Savinykh,&nbsp;G. V. Garkushin,&nbsp;I. A. Cherepanov,&nbsp;N. V. Sadovskaya,&nbsp;S. V. Razorenov","doi":"10.1134/S1029959925600971","DOIUrl":"10.1134/S1029959925600971","url":null,"abstract":"<p>The features of the deformation and fracture of polytetrafluoroethylene (PTFE) before and after exposure to gamma radiation above the melting point of the crystalline phase are investigated using shock wave loading methods at various impact velocities from 100 to 600 m/s, which corresponds to shock compression pressures of 0.17 ÷ 1.1 GPa. The acceleration of the impactors was carried out using a 50 mm pneumatic gun. The dependences of the spall strength of the two studied materials on the pressure at the shock wave front are constructed and compared by means of the analysis the velocity profiles of the free surface measured using the VISAR laser Doppler velocimeter. The range of strain rates ranged from 10⁶ to 10⁸ s^–1 under compression and 10⁴ to 10⁵ s^–1 in the rarefaction wave. PTFE irradiated in a melt has been studied under shock wave loading for the first time. It has been established that the spall strength of irradiated PTFE is constant and equal to 80 ÷ 85 MPa over the entire pressure range studied, which is 1.5–2 times higher than that of conventional PTFE (40 ÷ 45 MPa at pressures up to 0.6 GPa), and 3–4 times higher than the tensile strength of PTFE before and after irradiation at quasi–static tensile strength (15 ÷ 30 MPa). An upper estimate of the maximum tensile stresses showed that a complete rupture of PTFE occurs at stresses of 135–170 MPa, and irradiated PTFE at 220–250 MPa. The obtained estimates of tensile strength in the microsecond range of loading durations exceed the static tensile strength for PTFE by about 5–6 times (20 ÷ 30 MPa), and for irradiated PTFE by 15 times (15 MPa). The minimum pressure at which complete separation of the spall plate and fracture into several fragments is observed increases approximately twice after irradiation of PTFE in the melt and amounts to 0.55 GPa. The fracture into multiple fragments was recorded for irradiated PTFE at velocities and pressures also approximately twice as high as for conventional PTFE: 590 m/s and 1.09 GPa.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"29 5","pages":"781 - 798"},"PeriodicalIF":2.2,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transient Wave Propagation in Double–Porosity Spherical Cavities: A Spatiotemporal Nonlocal Elasticity Framework with Klein–Gordon Operator","authors":"Mohamed G. Salem,&nbsp;Ahmed E. Abouelregal,&nbsp;Hamid M. Sedighi","doi":"10.1134/S102995992560140X","DOIUrl":"10.1134/S102995992560140X","url":null,"abstract":"<p>This study introduces a novel Klein–Gordon-type spatiotemporal nonlocal elasticity framework to investigate transient wave propagation in spherical cavities characterized by double porosity. Unlike classical nonlocal models that rely solely on spatial parameters, this work innovatively integrates internal length- and characteristic time–scale parameters, simultaneously capturing size–dependent behaviors and temporal memory effects in porous microstructures. For the first time, this spatiotemporal approach is applied to the complex interaction between macro- and micro–voids in a spherical geometry. The governing equations for displacement, stresses, and coupled void volume fractions are derived, non–dimensionalized, and solved analytically using a time–harmonic approach with spherical Bessel functions. Numerical simulations demonstrate that increasing spatiotemporal nonlocality significantly smooths stress distributions and enhances damping near cavity surfaces, effectively mitigating stress concentrations that are prevalent in classical models. The analysis further uncovers distinctive wave modes arising from the interplay between dual porosity scales and applied radial stresses. As the first comprehensive treatment of spatiotemporal nonlocality in double–porosity spherical cavities, this work establishes a robust theoretical tool for predicting dynamic stability in advanced materials, with broad relevance for geomechanics, porous biomaterials, and subsurface engineering.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"29 5","pages":"813 - 836"},"PeriodicalIF":2.2,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Degradation of Ion–Plasma Nitride Coatings at Different Scale Levels under Frictional Wear Conditions","authors":"V. I. Kolesnikov,&nbsp;P. G. Ivanochkin,&nbsp;O. V. Kudryakov,&nbsp;I. V. Kolesnikov,&nbsp;D. S. Manturov","doi":"10.1134/S1029959925600946","DOIUrl":"10.1134/S1029959925600946","url":null,"abstract":"<p>In tribological tests of coatings, cyclic loads enable to evaluate the relationships between their wear, the kinetics of the initiation and propagation of cracks, as well as fatigue failure. For such purposes, a concept of degradation at different scale levels was developed. This made it possible to reveal that wear of the ion–plasma nitride coatings involved six stages, which depended on their microstructure. The widths of wear tracks were utilized as indicators of the degradation stages, while the internal morphologies reflected the fatigue mechanisms. Stepwise fragmentation of the coatings, as the most extensive stage and actual from a self–organization perspective, was analyzed in detail. In addition, the morphologies of the wear tracks were examined at different degradation stages.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"29 5","pages":"966 - 979"},"PeriodicalIF":2.2,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modification Lemaitre Damage Accumulation Model with Metastable Austenitic Steels under Fatigue","authors":"A. V. Gonchar,&nbsp;V. V. Mishakin,&nbsp;V. A. Klyushnikov,&nbsp;A. A. Solovyov","doi":"10.1134/S102995992560079X","DOIUrl":"10.1134/S102995992560079X","url":null,"abstract":"<p>A modification of the Lemaitre damage accumulation model that takes into account strain–induced martensitic transformation is proposed for metastable austenitic steels. The influence of the strain–induced martensite, accumulated microdamage and internal stresses on the dynamic Young’s modulus and density of the material was taken into account. Expressions have been obtained for calculating the Young’s modulus of the intact austenite and the change in the effective Young’s modulus due to the relaxation of residual stresses after the first cycles of elastic–plastic deformation. For the first time, the knee point of the fatigue curve between the low–cycle and high–cycle fatigue regions is presented in terms of the intensity of strain induced martensite formation. A comparison of the damage parameter calculated within the proposed model and the classical Lemaitre damage accumulation model was carried out. A method for individual life prediction at the final stage of structure evolution based on acoustic measurement data is proposed.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"29 5","pages":"883 - 894"},"PeriodicalIF":2.2,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Cu / Mn Content and Homogenization Modes on ALTEK Alloys Strip Microstructure and Properties","authors":"S. V. Konovalov,&nbsp;A. A. Levagina,&nbsp;E. V. Aryshenskii,&nbsp;D. Yu. Rasposienko,&nbsp;F. Jiang","doi":"10.1134/S1029959925601253","DOIUrl":"10.1134/S1029959925601253","url":null,"abstract":"<p>This paper presents the results of a comprehensive study on the microstructure and physical-mechanical properties of strips produced from promising ALTEK system aluminum alloys (2Cu1.5Mn and 3Cu₂Mn compositions) in a full thermomechanical processing cycle, including cold and hot rolling and annealing. The configuration of Al₂₀Cu₂Mn₃ phase particles is directly determined by the prior thermal and deformation processing. Long homogenization annealing led to the formation of coarse (up to 1 μm) Al₂₀Cu₂Mn₃ particles, which were unable to effectively inhibit polygonization and recrystallization processes. In contrast, homogenization annealing elimination promotes the formation of nano–dispersed Al₂₀Cu₂Mn₃ particles, characterized by a significantly higher distribution density within the aluminum matrix. Dispersed plate–shaped particles, in particular, make the greatest contribution to strengthening, effective polygonization, and recrystallization suppression. The obtained results lead to the conclusion that the homogenization annealing stage is impractical for the basic ALTEK alloys, as this operation leads to thermal stability and strength property degradation.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"29 5","pages":"850 - 863"},"PeriodicalIF":2.2,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure–Based Analysis of Deformation and Fracture in Coated Equiatomic Polycrystalline Titanium Nickelide","authors":"R. R. Balokhonov,&nbsp;V. R. Balokhonov,&nbsp;E. S. Marchenko,&nbsp;V. A. Romanova","doi":"10.1134/S1029959926600527","DOIUrl":"10.1134/S1029959926600527","url":null,"abstract":"<p>The coupled processes of stress–induced phase transformation, elastic–plastic deformation, and fracture during tensile loading and subsequent unloading of a polycrystalline TiNi alloy coated with an inner–outer layer system are investigated numerically, with the polycrystalline microstructure of Ti₄Ni₂O–TiO coating used as a representative example. The coating is synthesized from a Ti / Ni / Ti trilayer laminate deposited on a TiNi substrate. The microstructure of the coated polycrystalline composite is characterized experimentally using electron backscatter diffraction (EBSD). Based on the measured grain orientations and phase distribution, a finite element microstructure model of the coated material is constructed. Dynamic boundary value problems describing the deformation of the composite are solved using ABAQUS / Explicit. The constitutive model accounts for anisotropic elasticity, crystal plasticity, brittle and ductile fracture of the coating layers, and stress–induced phase transformation in the TiNi substrate. Numerical simulations are performed for several combinations of the mechanical behavior of the coating layers to investigate the coupled evolution of deformation and fracture. Particular attention is devoted to the influence of plastic deformation and cracking within the coating on the formation of residual martensite in the TiNi substrate after the composite unloading.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"29 5","pages":"837 - 849"},"PeriodicalIF":2.2,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Ultrasonic Treatment on Partitioning of Alloying Elements in Inconel 625 Alloy during Wire–Feed Electron–Beam Additive Manufacturing","authors":"D. A. Gurianov,&nbsp;S. V. Fortuna,&nbsp;A. V. Chumaevskii,&nbsp;S. Yu. Tarasov,&nbsp;K. S. Osipovich,&nbsp;K. V. Rubtsov,&nbsp;E. A. Kolubaev","doi":"10.1134/S1029959926600643","DOIUrl":"10.1134/S1029959926600643","url":null,"abstract":"<p>This study investigates the effect of ultrasonic (US) treatment, introduced through the substrate, on the macro- and microstructure, phase composition, segregation (partitioning) of alloying elements, and mechanical properties of IN625 alloy produced by wire–feed electron beam additive manufacturing (EBAM). The prolonged lifetime of the melt pool and the resulting partitioning of alloying elements in nickel–based alloys IN625 remain a significant challenge during additive manufacturing. Structural analysis revealed that the application of US–treatment through the substrate during fabrication leads to the disruption of epitaxial growth of columnar grains at layer boundaries and the formation of a fine–grained structure, thereby suppressing the pronounced crystallographic texture. At the same time, the overall degree of partitioning of Nb (<i>C</i>_in / <i>C</i>_d ~ (2.6 ÷ 2.8) wt. %) and Mo (<i>C</i>_in / <i>C</i>_d ~ 1.3 wt. %) into the interdendritic region remains virtually unchanged. Nevertheless, US–treatment alters the kinetics of phase transformations at the final stages of solidification: instead of predominantly MC–type carbides observed in the reference sample, coherent precipitates of the strengthening γ''–phase (Ni₃Nb, 15–40 nm), Laves phase, and rod–like δ–phase are formed. Uniaxial tensile testing demonstrated that US treatment increases the yield strength σ_0.2 by 70–100 MPa (up to 360–380 MPa) and the ultimate tensile strength σ_b by 150–170 MPa (up to 770–780 MPa) while maintaining high elongation ε (up to 75%) without significant anisotropy. The improvement in mechanical properties is attributed to the synergistic effect of grain refinement (Hall–Petch mechanism) and precipitation hardening due to the nanoscale γ''–phase.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"29 5","pages":"980 - 989"},"PeriodicalIF":2.2,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the Elastoplastic Properties of Additively Produced Metamaterials Based on the Biocompatible Ti6Al4V Alloy","authors":"L. B. Maslov,&nbsp;A. I. Borovkov,&nbsp;L. S. Nezhinskaya,&nbsp;M. A. Zhmaylo,&nbsp;F. D. Tarasenko","doi":"10.1134/S1029959925600740","DOIUrl":"10.1134/S1029959925600740","url":null,"abstract":"<p>This paper reports on the elastoplastic properties of additively manufactured specimens made of metamaterials based on the biocompatible titanium alloy Ti6Al4V, known as meta–biomaterials. The paper presents the results of experimental tests for three types of meta–biomaterials composed of beam–based Diamond unit cell and surface–based Gyroid and IWP unit cells, with 30, 50 and 70% volume fractions of solid material. The experimental tests were carried out for quasi–static tension and compression scenarios. The load–displacement curves obtained were used to evaluate Young’s modulus, yield strength and the parameters of the plastic response. We additionally built finite element models of the given metamaterials, performing numerical simulation of the obtained tensile specimens accounting for the mechanical properties of the additively manufactured titanium alloy. Analyzing the experimental and numerical test results, we established qualitatively similar behavior in both the elastic and plastic deformation regions, as well as different values for the effective elastic characteristics under tension and compression. The observed discrepancies between the numerical and experimental data can be attributed to printing defects in the metamaterials, induced by their complex internal structure and the specifics of the additive manufacturing process.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"29 4","pages":"684 - 712"},"PeriodicalIF":2.2,"publicationDate":"2026-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148783020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}