Letters on Materials最新文献_第3页

Simulation of recoverable strain variation during isothermal holding of the Ni51Ti49 alloy under various regimes Ni51Ti49合金在不同状态下等温保温过程中可恢复应变变化的模拟

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Letters on Materials Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-33-38

N. Resnina, A. Ivanov, Feodor Belyaev, Alexander Volkov, S. Belyaev

{"title":"Simulation of recoverable strain variation during isothermal holding of the Ni51Ti49 alloy under various regimes","authors":"N. Resnina, A. Ivanov, Feodor Belyaev, Alexander Volkov, S. Belyaev","doi":"10.22226/2410-3535-2023-1-33-38","DOIUrl":"https://doi.org/10.22226/2410-3535-2023-1-33-38","url":null,"abstract":"The aim of the present paper is to simulate the strain variation on isothermal holding of Ni-rich NiTi alloy under various regimes. The modified Likhachev-Volkov microstructural model and a new Nelder-Mead algorithm for the determination of the model parameters were used. To determine the model parameters, the experimental data obtained during holding of the Ni 51 Ti 49 alloy under a stress of 200 MPa were chosen. Using these parameters, the strain variation on holding of the NiTi alloy under a stress in two regimes was simulated. It was shown that the modified Likhachev-Volkov microstructural model allowed one to calculate the isothermal strain variation on holding after cooling under a stress (Regime 1) and a good correlation between the theoretical and experimental results were found. At the same time, the simulation of the strain variation on holding after active deformation (Regime 2) did not fit to experimental data because the model did not consider the difference in the stored elastic energy in two regimes. It was shown that a decrease in the elastic energy stored during the transformation increased the strain during holding under a stress after active deformation and made the simulated curves to be close to the experimental.","PeriodicalId":45792,"journal":{"name":"Letters on Materials","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45738171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing residual stresses in the surface layer of the ZK60 alloy after an exposure to corrosion solution 评估暴露于腐蚀溶液后ZK60合金表层的残余应力

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Letters on Materials Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-14-19

E. Merson, V. Poluyanov, A. Polunin, P. Myagkikh, D. Merson, A. Vinogradov

{"title":"Assessing residual stresses in the surface layer of the ZK60 alloy after an exposure to corrosion solution","authors":"E. Merson, V. Poluyanov, A. Polunin, P. Myagkikh, D. Merson, A. Vinogradov","doi":"10.22226/2410-3535-2023-1-14-19","DOIUrl":"https://doi.org/10.22226/2410-3535-2023-1-14-19","url":null,"abstract":"Magnesium alloys preliminary immersed in a corrosion solution suffer from embrittlement, referred to as pre-exposure stress corrosion cracking (PESCC). It was suggested that PESCC can be attributed to the corrosion product film-induced stress (CPFIS), which is known to be responsible for SCC in many alloys. However, the internal stress associated with the formation of the corrosion products (CP) layer on Mg alloys have not been investigated as yet. Thus, in the present study, the internal residual stresses of the first and second kinds were assessed in the alloy ZK60 exposed to the corrosion solution, using the deflection of the thin plate and by the X-ray diffraction technique, respectively. It is found that the deposition of CP on the surface of the alloy ZK60 creates the compressive internal stresses of both kinds — I and II. The macro residual stress of the kind I in the thin plate is found to be not exceeding 3 MPa, while the micro residual stress of the second type in the surface layer of 20 – 30 µm can be as high as 290 MPa and cause plastic deformation of the bare metal with the internal stress which cannot be relieved by the removal of CP.","PeriodicalId":45792,"journal":{"name":"Letters on Materials","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41469853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of cooling rate on the bainite fraction in low carbon martensitic steel: combined analysis of transformation kinetics and crystal curvature 冷却速率对低碳马氏体钢贝氏体分数的影响:相变动力学和结晶曲率的综合分析

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Letters on Materials Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-67-72

A. Zisman, N. Zolotorevsky, S. Petrov, N. Ermakova

引用次数: 0

Functional properties of NiTi / Kapton nanocomposites deposited by electronic beam evaporation 电子束蒸发沉积NiTi / Kapton纳米复合材料的功能特性

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Letters on Materials Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-62-66

A. Sibirev, M. Alchibaev, Sergei Belyaev, N. Resnina, I. Palani, S. Jayachandran, Anshu Sahu

引用次数: 0

Physico-chemical properties of silicon-carbon films obtained by electrochemical deposition 电化学沉积碳化硅薄膜的物理化学性质

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Letters on Materials Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-39-44

I. Bogush, N. Plugotarenko, T. Myasoedova, V. Ptashnik

引用次数: 0

Strain-rate dependent deformation behavior of additively manufactured stainless steel with different fractions of δ-ferrite 不同δ-铁素体分数的增材不锈钢应变速率相关变形行为

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Letters on Materials Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-28-32

S. Astafurov, E. Melnikov, M. Panchenko, Kseniia Reunova, A. Luchin, E. Zagibalova, E. Astafurova, E. Kolubaev

引用次数: 0

Influence of carbon on the structural-phase composition and hardness of steel ingots of the Fe-Cr-Mo-N-C system obtained by the SHS method under nitrogen pressure 碳对氮压下SHS法制备Fe-Cr-Mo-N-C系钢锭组织物组成及硬度的影响

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Letters on Materials Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-85-89

M. Konovalov, V. Lad’yanov, M. Mokrushina, V. Karev

引用次数: 0

Peculiarities of using dumbbell specimens made of elastomeric materials subject to finite deformation in complex loading tests 弹性材料哑铃试样在复杂载荷试验中受有限变形的特点

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Letters on Materials Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-56-61

V. Shadrin, A. Svistkov, K. Mokhireva, O. Garishin

{"title":"Peculiarities of using dumbbell specimens made of elastomeric materials subject to finite deformation in complex loading tests","authors":"V. Shadrin, A. Svistkov, K. Mokhireva, O. Garishin","doi":"10.22226/2410-3535-2023-1-56-61","DOIUrl":"https://doi.org/10.22226/2410-3535-2023-1-56-61","url":null,"abstract":"The features of experiments with dumbbell specimens performed to determine the mechanical properties of filled elastomers are analyzed. Emphasis is placed on testing materials that experience a complex loading history. Experiments such as cyclic loading with increasing amplitude of deformations and with nested stress / strain cycles are considered. It has been established that the rate of change of the stretch ratio in the central part (gauge section) of the specimen significantly differs from that calculated from the analysis of the positions of the grips. This difference manifests itself more prominently in the experiments with complex loading algorithms. The reason is that the viscoelastic properties and the Mullins effect of the filled elastomer are different in the central part of the specimen and at its ends near the grips. The presence of inhomogeneous deformation in the gauge section leads to additional difficulties associated with finding constants for constitutive equations. Besides, this phenomenon complicates a comparison of the mechanical properties of different materials, because detailed information on their behavior can be obtained in complex experiments only. So, experiments with straight specimens or rings with a rectangular cross-section offer more possibilities for studying the mechanical properties of filled elastomers than the experiments with dumbbell specimens.","PeriodicalId":45792,"journal":{"name":"Letters on Materials","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49216288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon matrix nanostructured composites as a new type of supercapacitor electrode materials 碳基纳米复合材料是一种新型的超级电容器电极材料

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Letters on Materials Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-20-27

Yuri Zakharov, G. Simenyuk, Tatiana Sergina, N. Ivanova, T. Larichev, I. Zykov, Yulia N. Dudnikova

{"title":"Carbon matrix nanostructured composites as a new type of supercapacitor electrode materials","authors":"Yuri Zakharov, G. Simenyuk, Tatiana Sergina, N. Ivanova, T. Larichev, I. Zykov, Yulia N. Dudnikova","doi":"10.22226/2410-3535-2023-1-20-27","DOIUrl":"https://doi.org/10.22226/2410-3535-2023-1-20-27","url":null,"abstract":"Carbon matrix nanocomposites C / Au and C / Mn x O y are obtained by a reduction of HAuCl 4 and KMnO 4 precursor solutions with single-walled carbon nanotubes or highly porous carbon materials obtained by high-temperature alkaline activation of various metamorphism degree coals. The morphology of the nanocomposite materials is studied by the electron microscopy. It is found that the filler introduction slightly reduces the specific surface of matrices and, due to the blocking of meso-and micropore volumes, filler nanoparticles do not precipitate in the pores of a predominantly microporous matrix and partially decorate them in mixed-type matrices (meso-and micropores). Nanocomposites have been studied as supercapacitor electrode materials. It is established that decorating the matrix surface with both types fillers (Au, which increases the electrical double layer capacitance, and Mn x O y , which is electrochemically active in a given potential window due to the occurrence of Red-O x electrode processes) results in an increase in the supercapacitor electrodes capacitance. The most significant effect is observed for composites based on the SWCNT and highly porous Boghead in the region of high potential scan rates by a factor of 3.4 – 4.5, and in the region of low rates (2.5 – 2.8), depending on the filler. The results obtained allow one to consider the composites C / Au and C / Mn x O y as promising materials for the development of SC electrodes.","PeriodicalId":45792,"journal":{"name":"Letters on Materials","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46332904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Signs of the presence of an ordered phase in the Cu-5.9 at.% Pd alloy after its long-term annealing at a moderate temperature Cu-5.9中存在有序相的迹象在.% Pd合金在中等温度下长期退火后

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Letters on Materials Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-3-8

O. Novikova, A. Kostina, E. Volkova, Yu. A. Salamatov, A. Glukhov, A. Volkov, V. Marchenkov, V. Gaviko, Yuriy Ustyugov

引用次数: 0