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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
IF 0.7 Q3 Materials Science Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-33-38
N. Resnina, A. Ivanov, Feodor Belyaev, Alexander Volkov, S. Belyaev
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.
本文的目的是模拟不同条件下富镍NiTi合金等温保温时的应变变化。采用改进的Likhachev-Volkov微观结构模型和新的Nelder-Mead算法确定模型参数。为了确定模型参数,选取了Ni 51 Ti 49合金在200 MPa应力下保温的实验数据。利用这些参数,模拟了两种应力状态下NiTi合金的应变变化规律。结果表明,改进的Likhachev-Volkov微观结构模型可以计算出在应力状态1下冷却后保温的等温应变变化,理论结果与实验结果具有良好的相关性。同时,由于模型没有考虑两种状态下储存弹性能的差异,对主动变形(状态2)后保持时的应变变化的模拟与实验数据不拟合。结果表明,在主动变形后的应力作用下,变形过程中所储存的弹性能的减少增加了保持过程中的应变,使模拟曲线与实验曲线更为接近。
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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
IF 0.7 Q3 Materials Science Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-67-72
A. Zisman, N. Zolotorevsky, S. Petrov, N. Ermakova
Derived by means of EBSD, statistics of crystal curvature in quenched low carbon steel is analyzed with allowance for its transformation kinetics in terms of dilatometry data. Based on curvature spectra sensitive to the distribution of dislocation density, fractions of martensite and bainite are quantified at high and low cooling rates. Distinction between the resulting microstructures is ascribed to various proportions of their athermal and thermally activated (rate-dependent) constituents.
利用EBSD方法,对淬火低碳钢的结晶曲率进行了统计分析,并考虑了其转变动力学。基于对位错密度分布敏感的曲率谱,定量了高、低冷却速率下的马氏体和贝氏体组分。所产生的微观结构之间的区别归因于它们的非热激活和热激活(速率依赖)成分的不同比例。
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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
IF 0.7 Q3 Materials Science 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
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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
IF 0.7 Q3 Materials Science 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
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.
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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
IF 0.7 Q3 Materials Science 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
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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
IF 0.7 Q3 Materials Science Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-39-44
I. Bogush, N. Plugotarenko, T. Myasoedova, V. Ptashnik
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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
IF 0.7 Q3 Materials Science Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-85-89
M. Konovalov, V. Lad’yanov, M. Mokrushina, V. Karev
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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
IF 0.7 Q3 Materials Science Pub Date : 2023-03-01 DOI: 10.22226/2410-3535-2023-1-56-61
V. Shadrin, A. Svistkov, K. Mokhireva, O. Garishin
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.
分析了用哑铃试样测定填充弹性体力学性能的实验特点。重点放在测试经历复杂加载历史的材料上。考虑了诸如具有增加的变形幅度和嵌套的应力/应变循环的循环载荷的实验。已经确定,试样中心部分(标距截面)拉伸比的变化率与通过夹具位置分析计算的变化率显著不同。这种差异在复杂加载算法的实验中表现得更为突出。原因是填充弹性体的粘弹性性质和穆林斯效应在试样的中心部分和靠近夹具的端部不同。规范截面中不均匀变形的存在导致了与寻找本构方程常数相关的额外困难。此外,这种现象使不同材料的力学性能的比较变得复杂,因为只有在复杂的实验中才能获得关于它们行为的详细信息。因此,与哑铃试样相比,用矩形截面的直试样或环进行的实验为研究填充弹性体的力学性能提供了更多的可能性。
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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
IF 0.7 Q3 Materials Science 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
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.
碳基纳米复合材料C/Au和C/MnxOy是由HAuCl4和KMnO4前驱体溶液与单壁碳纳米管或通过高温碱性活化不同变质程度的煤而获得的高度多孔碳材料还原而获得的。用电子显微镜研究了纳米复合材料的形貌。研究发现,填料的引入略微降低了基质的比表面积,并且由于中孔和微孔体积的堵塞,填料纳米颗粒不会沉淀在以微孔为主的基质的孔中,并将其部分修饰在混合型基质(中孔和微孔)中。纳米复合材料已被研究作为超级电容器电极材料。已经确定,用两种类型的填料(Au,它增加了双电层电容,MnxOy,它由于Red-Ox电极过程的发生而在给定的电势窗口中具有电化学活性)装饰基体表面会导致超级电容器电极电容的增加。基于SWCNT和高度多孔Boghead的复合材料在高电位扫描速率(3.4–4.5倍)区域和低速率(2.5–2.8)区域观察到最显著的影响,具体取决于填料。所获得的结果允许人们认为C/Au和C/MnxOy复合材料是开发SC电极的有前途的材料。
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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
IF 0.7 Q3 Materials Science 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
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Letters on Materials
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