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OBTAINING GRAPHENE STRUCTURES AND NANOPOLYMERS USING ULTRASONIC VIBRATIONS 利用超声波振动获得石墨烯结构和纳米聚合物
Pub Date : 2021-01-01 DOI: 10.18323/2073-5073-2021-3-74-83
V. Rubanik, V. O. Savitsky, V. Rubanik, V. F. Lutsko, I. Nikiforova, H. T. Bui, Dinh Phuong Doan
Graphene-based polymer nanocomposites are considered a promising class of future materials. The degree of filling, the filler and binder nature, and the shape, size, and mutual arrangement of filler particles determine the properties of a polymer composite material. The destruction of nanoparticles aggregates occurs most effectively in liquid media under the action of ultrasonic vibrations. The authors proposed the technique and designed laboratory equipment for ultrasonic treatment of the finely-dispersed graphite suspension, carried out the ultrasonic treatment (UST) of finely-dispersed graphite powder. The suspensions based on graphite with a solvent were obtained. The authors carried out the experiments on producing graphene using the graphite liquid-phase exfoliation method at the ultrasonic treatment with different ultrasonic treatment times, analyzed experimental data, and selected the UST optimal time. The paper contains the results of the study of the effect of the graphite suspension base on the degree of ultrasonic liquid-phase exfoliation of graphite. The most effective synthesis of graphene structures using UST is synthesis from graphite suspensions based on dichloroethane, benzol, and dichlorobenzene. Graphene structures’ output ratio amounts to up to 66 %. The authors developed the technology for producing polymers modified with graphene structures using ultrasonic dispersion. Based on graphene synthesized by the graphite liquid-phase exfoliation, the authors obtained nanopolymers using ultrasonic vibrations, carried out DSC measurements, and studied their strength properties. The limit strength of elastic polymers is from 1.9 to 3.6 MPa at different concentrations of graphene inclusions. The residual elongation of samples within the deviation did not change and amounted to 200 %.
石墨烯基聚合物纳米复合材料被认为是一种很有前途的未来材料。填充程度、填料和粘结剂的性质以及填料颗粒的形状、大小和相互排列决定了聚合物复合材料的性能。在超声振动作用下,纳米粒子聚集体的破坏在液体介质中发生得最为有效。提出了超声处理细分散石墨悬浮液的工艺并设计了实验设备,对细分散石墨粉体进行了超声处理。得到了以溶剂为基础的石墨悬浮液。对不同超声处理次数的石墨液相剥脱法在超声处理下制备石墨烯进行了实验,并对实验数据进行了分析,选择了超声处理的最佳时间。本文研究了石墨悬浮液对石墨超声液相剥离程度的影响。使用UST合成石墨烯结构最有效的方法是由基于二氯乙烷、苯和二氯苯的石墨悬浮液合成。石墨烯结构的产出率高达66%。作者开发了利用超声波分散制备石墨烯结构改性聚合物的技术。以石墨液相剥离法制备的石墨烯为基础,采用超声振动法制备纳米聚合物,进行DSC测量,并对其强度特性进行了研究。在不同浓度的石墨烯包裹体下,弹性聚合物的极限强度在1.9 ~ 3.6 MPa之间。样品的残余伸长率在偏差范围内没有变化,达到200%。
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引用次数: 0
IDENTIFICATION OF ACOUSTIC EMISSION SOURCES IN A POLIMER COMPOSITE MATERIAL UNDER THE CYCLE TENSION LOADING 循环张力载荷下聚合物复合材料声发射源的识别
Pub Date : 2021-01-01 DOI: 10.18323/2073-5073-2021-3-19-27
A. Bryansky, O. Bashkov
The structure of polymer composite materials (PCM) provides high mechanical properties but, at the same time, is highly sensitive to the formation of internal defects. Therefore, when designing, manufacturing products, and assessing their reliability in service, much attention is paid to the methods of non-destructive testing, among which the method of acoustic emission (AE) has proven itself to study structural changes in material under external influence. The paper deals with the identification of typical damages in fiberglass samples made of T11-GVS9 glass fiber cloth and DION 9300 FR binder and tested under cyclic tension using the AE method. In the work, the authors solved the problem of selecting the AE informative parameters and used a clustering method to identify the nature and the formation kinetics of the AE sources. The authors performed clustering using the Kohonen self-organization map (SOM) with the Fourier spectra calculated for the AE signals recorded during cyclic tests. Based on the peak frequencies analysis of the produced clusters, the researchers determined their nature and calculated the periods of critical accumulation. When characterizing the AE sources, the authors used the peak frequencies analysis of the wavelet spectra performed for different levels of decomposition. The authors determined the damage accumulation stages of samples during testing based on own research and research by other authors’ results. The study established that registration of AE signals identified as adhesion failure can be used to identify the onset of the material destruction and characterized the local formation of micro-damages in the matrix and fracture of fibers can be used to predict the destruction of PCM.
高分子复合材料(PCM)的结构提供了高的力学性能,但同时对内部缺陷的形成高度敏感。因此,在设计、制造产品和评估产品的使用可靠性时,人们非常重视无损检测的方法,其中声发射(AE)方法已被证明可以研究材料在外界影响下的结构变化。采用声发射法对T11-GVS9玻璃纤维布和DION 9300 FR粘结剂制成的玻璃纤维样品进行了循环拉伸试验,并对其进行了典型损伤识别。本文解决了声发射信息参数的选择问题,并采用聚类方法对声发射源的性质和形成动力学进行了识别。作者使用Kohonen自组织映射(SOM)和计算的傅立叶谱对循环测试中记录的声发射信号进行聚类。基于对产生的簇的峰值频率分析,研究人员确定了它们的性质,并计算了临界积累的周期。在表征声发射源时,作者使用了对不同分解水平的小波谱进行的峰值频率分析。根据自己的研究成果和他人的研究成果,确定了试样在试验过程中的损伤积累阶段。研究发现,识别为粘接失效的声发射信号的配准可用于识别材料破坏的开始,表征基体中局部微损伤的形成,纤维断裂可用于预测PCM的破坏。
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引用次数: 0
The research of the processes of formation of porous non-ferrous metals 多孔有色金属形成过程的研究
Pub Date : 2021-01-01 DOI: 10.18323/2073-5073-2021-2-9-17
A. Kovtunov, D. A. Semistenov, Y. Khokhlov, S. V. Myamin
Foamed metals are promising materials with a unique combination of mechanical and operational properties: low specific gravity, low thermal conductivity, ability to absorb acoustic and electromagnetic vibrations, and the ability to deform under a constant load. Currently, the most used methods for producing foamed aluminum and foamed magnesium are methods based on mixing gas or porophore into molten aluminum and forming a porous structure during the solidification of the aluminum melt. An alternative to this technology is the formation of a porous structure through the use of soluble granules that pre-fill the mold and after impregnating the granules with molten metal and solidifying the castings, they are leached. The work aims to determine the influence of casting modes and the size of granules on the depth of impregnation of granular filling with metal melt during the formation of porous aluminum castings. The authors proposed the technique for calculating the depth of impregnation of granular filling when producing castings of porous non-ferrous metals based on the calculation of melt cooling when moving along the thin-walled channel. The calculations made it possible to determine the depth of impregnation and establish the allowable wall thickness of the casting of porous aluminum, depending on the size of the granules used, the speed of the melt in a form, the mold temperature, and the temperature of molten aluminum. The study identified that to increase the depth of impregnation and obtain porous aluminum castings with thinner walls, it is advisable to increase the diameter of the salt granules and not the temperature and hydrodynamic modes of casting. The authors carried out calculations and identified the influence of the casting regimes and the diameter of the granules on the depth of mold impregnation to obtain porous castings from promising magnesium alloys.
泡沫金属是一种很有前途的材料,具有独特的机械和操作性能组合:低比重、低导热性、吸收声波和电磁振动的能力,以及在恒定负载下变形的能力。目前,生产泡沫铝和泡沫镁最常用的方法是将气体或孔团混合到铝液中,并在铝熔体凝固过程中形成多孔结构。该技术的另一种替代方法是通过使用可溶性颗粒来形成多孔结构,该颗粒预先填充模具,然后用熔融金属浸渍颗粒并使铸件凝固,然后将其浸出。本工作旨在确定在多孔铝铸件形成过程中,铸造方式和颗粒尺寸对金属熔体填充颗粒浸渍深度的影响。本文提出了在计算熔体沿薄壁孔道移动时的冷却过程的基础上,计算多孔有色金属铸件颗粒填料浸染深度的方法。通过计算,可以确定浸渍深度,并确定多孔铝铸件的允许壁厚,这取决于所用颗粒的大小、熔化速度、模具温度和铝液的温度。研究发现,要增加浸渍深度,获得更薄壁的多孔铝铸件,应增加盐粒直径,而不是增加铸件的温度和水动力模式。作者进行了计算,确定了铸造制度和颗粒直径对模具浸渍深度的影响,以获得有前途的镁合金多孔铸件。
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引用次数: 0
The comparative analysis of thermal effects in elastomers modified with MCNT at constant DC voltage 恒直流电压下MCNT改性弹性体热效应的对比分析
Pub Date : 2021-01-01 DOI: 10.18323/2073-5073-2021-1-63-73
A. Shchegolkov
The author carried out the comparative analysis of elastomers – polyurethane (NPC) and silicone compound (NCOC) modified with carbon nanotubes (MCNT) with a mass content of 1 to 9 %. MCNTs were synthetically produced by the CVD technology using Co-Mo/Al2O3-MgO (MCNT1) and Fe-Co/2,1Al2O3 (MCNT2) catalysts. The analysis of experimental study results showed that the lowest specific bulk electrical conductivity (5×10-10 Cm×cm-1) was typical for polyurethane elastomer (1 mass. % MCNT synthetically produced using Fe-Co/2,1Al2O3 catalyst). For the silicone elastomer modified with 9 mass. % MCNT1, the specific bulk electrical conductivity was 4×10-1 Cm×cm-1. The author identified the parameters of percolation of electrical conductivity model for NPC, NCOC with MCNT1 and MCNT2, taking into account the MCNT packing factor and electrical conductivity critical index. The maximum temperature field uniformity is typical for silicone elastomer with 7 mass. % MCNT2. Nonuniform temperature field in modified polyurethane-based elastomers can be caused by the local MCNT entanglement manifested in the creation of agglomerates or more dense electrically-conductive circuit packing, which, in its turn, results in the decrease in heat power. The heating temperature of nanomodified composites produced from NCOC 1 and NCOC 2 can vary from 32.9 to 102 °С. The author studied the modes of nanomodified elastomers heat generation in the range of 6 to 30 V, compared heat generation in the elastomer-based and ceramics-based samples. The study allowed identifying the best combination of the polymeric matrix and MCNT type. For the electric heater, it is the most efficient to apply silicone compound at the 7 % MCNT concentration and, depending on the feeding voltage level of 12 or 24 V, to use MCNT1 or MCNT2.
对质量含量为1 ~ 9%的碳纳米管(MCNT)改性弹性体-聚氨酯(NPC)和硅酮化合物(NCOC)进行了对比分析。以Co-Mo/Al2O3-MgO (MCNT1)和Fe-Co/ 2,1al2o3 (MCNT2)为催化剂,采用CVD技术合成了MCNTs。对实验研究结果的分析表明,1质量的聚氨酯弹性体具有最低的比体积电导率(5×10-10 Cm×cm-1)。使用Fe-Co/ 2,1al2o3催化剂合成的% MCNT)。对质量为9的有机硅弹性体进行改性。% MCNT1,比体积电导率为4×10-1 Cm×cm-1。考虑MCNT填充系数和电导率临界指标,分别用MCNT1和MCNT2确定了NPC、NCOC的渗透电导率模型参数。最大温度场均匀性是典型的硅弹性体7质量。% MCNT2。改性聚氨酯弹性体中的不均匀温度场可能是由局部MCNT缠结引起的,这种缠结表现为团块的产生或更密集的导电电路包装,这反过来又导致热功率的降低。由ncoco1和ncoco2制备的纳米复合材料的加热温度在32.9 ~ 102°С之间变化。研究了纳米改性弹性体在6 ~ 30 V范围内的发热模式,比较了弹性体基和陶瓷基样品的发热模式。该研究确定了聚合物基质和MCNT类型的最佳组合。对于电加热器,在7%的MCNT浓度下应用有机硅化合物是最有效的,并且根据12或24 V的馈电电压水平,使用MCNT1或MCNT2。
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引用次数: 1
THE INFLUENCE OF ELEMENTAL POWDER RAW MATERIAL ON THE FORMATION OF THE POROUS FRAME OF TI3ALC2 MAX-PHASE WHEN OBTAINING BY THE SHS METHOD 单质粉末原料对SHS法制备ti3alc2 max相多孔框架形成的影响
Pub Date : 2021-01-01 DOI: 10.18323/2073-5073-2021-3-37-47
D. Davydov, E. Umerov, E. I. Latukhin, A. Amosov
The ternary carbide compound Ti3AlC2 belongs to the so-called MAX-phases – a new type of ceramic materials with unique properties. A simple energy-saving method of self-propagating high-temperature synthesis (SHS) based on combustion is one of the promising methods for the production of this MAX-phase. The application of the SHS technology is to produce a Ti3AlC2 MAX-phase porous frame with the homogeneous porous structure without such defects as large pores, laminations, and cracks is of great interest. The paper investigates the possibility of producing such a porous frame with the maximum content of the Ti3AlC2 MAX-phase using powders of Ti, Al, and C elements of various grades different in particle sizes and carbon forms (soot or graphite) as initial components. Porous frame samples were produced by the open-air burning of pressed briquettes of charge of the initial powders of the selected grades without applying external pressure. The authors studied the macro- and microstructure of the obtained samples, their density, and phase composition. The study shows that using the finest titanium and carbon powders leads to the excessively active combustion with gas evolution and the synthesis of the defective porous samples with the charge briquette shape distortion, large pores, laminations, and cracks. Besides the titanium carbide by-phase, the highest values for the MAX-phase amount in the SHS-product were obtained using the titanium powder of the largest-size fraction together with the graphite powder, rather than soot. The excess aluminum powder addition to the stoichiometric ratio to the initial charge leads to an increase in the MAX-phase amount in the SHS product, compensating for the loss of aluminum due to evaporation. An increase in the sample volume (scale factor) also leads to an increase in the MAX-phase amount in the SHS product due to the slower cooling of the product after the reaction.
三元碳化物化合物Ti3AlC2属于所谓的max相,是一种具有独特性能的新型陶瓷材料。一种简单节能的基于燃烧的自传播高温合成(SHS)方法是生产该max相的有前途的方法之一。SHS技术的应用是制备具有均匀多孔结构的Ti3AlC2 max相多孔框架,该框架不存在气孔大、片状、裂纹等缺陷。本文研究了使用不同粒度和碳形式(烟灰或石墨)的不同等级的Ti、Al和C元素粉末作为初始组分,生产Ti3AlC2 max相含量最高的多孔框架的可能性。多孔框架样品是在不施加外部压力的情况下,通过对选定等级的初始粉末的压药型块进行露天燃烧而产生的。作者研究了所得样品的宏观和微观结构、密度和相组成。研究表明,使用最细的钛碳粉会导致燃烧过于活跃,并伴有气体的析出,合成的多孔缺陷样品具有装药型煤形状变形、气孔大、片状和裂纹。除分相碳化钛外,最大粒径钛粉与石墨粉混合时,shs产品的max相量最大,而不是煤烟。过量的铝粉加入到初始电荷的化学计量比中,导致SHS产物中max相量的增加,补偿了由于蒸发导致的铝的损失。样品体积(比例因子)的增加也会导致SHS产物中max相量的增加,因为反应后产物冷却速度较慢。
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引用次数: 2
In-situ study of the corrosion process of biodegradable magnesium alloys 可生物降解镁合金腐蚀过程的原位研究
Pub Date : 2021-01-01 DOI: 10.18323/2073-5073-2021-2-18-25
P. Myagkikh, E. Merson, V. Poluyanov, D. Merson
The interest in magnesium and its alloys considerably increases in recent years. These materials have a unique complex of properties: light-weight and strength make magnesium alloys promising structural materials for the aircraft industry and space application, and ability to reabsorb in vivo conditions and good biocompatibility allow producing biodegradable surgical implants of magnesium alloys, which can resorb in a human body without detriment to health. The materials for such demanding applications require detailed investigation of their properties, such as corrosion, including the kinetics of corrosion rate and staging of corrosion damage on the surface. To obtain a full view of the corrosion process, in addition to common ex-situ methods such as the corrosion rate evaluating using the weight loss method and the morphology corrosion damage investigation by optical or confocal laser scanning microscopy (CLSM), it is important to use modern in-situ methods. In-situ methods allow obtaining data immediately during the experiment and not after its completion. The authors carried out a comprehensive study of the corrosion process of the commercial ZK60 and AZ31 magnesium alloys in the simulated human-body environment (temperature, corrosion media composition, circulation of corrosion media) using in-situ methods, including hydrogen evolution corrosion rate evaluating and video-observation of a sample surface. The results show that AZ31 alloy is more corrosion-resistant than ZK60 alloy. Moreover, AZ31 alloy is prone to filiform surface corrosion, and ZK60 alloy exhibits severe pitting corrosion. Based on the comparison of the data obtained by in-situ and ex-situ methods, the authors concluded on their main differences and features.
近年来,人们对镁及其合金的兴趣大大增加。这些材料具有独特的复合性能:轻质和强度使镁合金成为航空工业和空间应用的有前途的结构材料,并且在体内条件下的重吸收能力和良好的生物相容性允许生产可生物降解的镁合金外科植入物,镁合金可以在人体中重新吸收而不会损害健康。这种苛刻的应用需要对材料的性能进行详细的研究,例如腐蚀,包括腐蚀速率的动力学和表面腐蚀损伤的分期。为了全面了解腐蚀过程,除了常用的非原位方法,如用失重法评估腐蚀速率和用光学或共聚焦激光扫描显微镜(CLSM)研究腐蚀损伤的形貌外,重要的是使用现代原位方法。原位方法允许在实验期间立即获得数据,而不是在实验完成后。采用原位方法对ZK60和AZ31镁合金在模拟人体环境(温度、腐蚀介质组成、腐蚀介质循环)下的腐蚀过程进行了全面研究,包括析氢腐蚀速率评估和样品表面视频观察。结果表明,AZ31合金的耐蚀性优于ZK60合金。AZ31合金易出现丝状表面腐蚀,ZK60合金出现严重的点蚀。通过对原位法和非原位法实测资料的比较,总结了两者的主要区别和特点。
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引用次数: 1
DETERMINATION OF SUSTAINABLE LEVELS OF DESIGN ALTERNATIVES SELECTION IN THE WORKFLOW CAP SYSTEM 工作流上限系统中设计方案选择的可持续水平的确定
Pub Date : 2021-01-01 DOI: 10.18323/2073-5073-2021-3-48-56
S. Mitin, P. Bochkarev, V. Shalunov, I. A. Razmanov
The development of the mechanical treatment workflow CAP system is aimed at the solution of a crucial task of reduction of terms and the improvement of quality of multiproduct machining manufactures work preparation, as the existing workflow CAP systems have not got the possibility of fast response to changes in a production situation often arising within the multiproduct manufacture. The authors of this paper developed the workflow CAP system, which contains the requirements of the design activity full automation, design solution multivariance, and the feedback with the engineering process implementation subsystem. The paper deals with the development of a mathematical model and the technique of searching for sustainable levels of selecting design alternatives depending on the production situation for the whole design procedures of the workflow CAP system. The authors prove the application of a mathematical tool of genetic algorithms; describe the mathematical model using its terms. As a gene, the level of selection in a separate project procedure is specified. A chromosome is a set of genes according to the project procedures. The objective function determines the minimum total time of processing of the specified nomenclature of parts based on the ranges of gene aggregates resulting from crossing and mutation operations. The result of the work is the mathematical model and the technique for identifying the sustainable levels of selection in each project procedure ensuring the possibility of self-adjustment of the workflow CAP system depending on the production situation.
针对多产品加工制造中经常出现的生产情况变化,现有的工艺流程CAP系统无法快速响应,因此开发机械加工流程CAP系统是为了解决多产品加工制造企业工作准备中缩短条件和提高质量的关键任务。本文开发了包含设计活动全自动化、设计方案多方差、与工程过程实现子系统反馈等需求的工作流CAP系统。本文讨论了工作流CAP系统的整个设计过程的数学模型的建立和根据生产情况寻找可持续的设计方案选择水平的技术。作者证明了遗传算法的数学工具的应用;用数学模型的术语描述它。作为一个基因,在一个单独的项目程序中的选择水平是指定的。根据项目程序,染色体是一组基因。目标函数根据由杂交和突变操作产生的基因聚集体的范围确定处理特定命名部分的最小总时间。工作的结果是数学模型和技术,用于确定每个项目过程中的可持续选择水平,确保工作流CAP系统根据生产情况进行自我调整的可能性。
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引用次数: 0
Microstructure and strength of joints of nickel sheets produced by ultrasonic welding 超声波焊接镍片接头的显微组织和强度
Pub Date : 2021-01-01 DOI: 10.18323/2073-5073-2021-2-75-81
E. R. Shayakhmetova, M. Murzinova, A. Nazarov
Ultrasonic welding (USW) is one of the methods for producing solid-phase joints of thin metal sheets, which in the future can be used to obtain laminated composite materials, for additive manufacturing and renovation of metallic articles. The quality of joints depends on both the processing conditions and the properties of welded metals and alloys. At present, the USW conditions, the properties, and structure of weld joints of strong metals, in particular, of nickel, are underexplored. In this work, the authors studied the influence of the compressive load magnitude on the lap shear strength and the structure of joints of annealed nickel sheets with a thickness of 0.5 mm produced by spot USW. The authors carried out USW at a vibration frequency of 20 kHz with an amplitude of 15 μm, the time of welding was equal to 2 s. The compressive load magnitude was varied from 3.5 to 7 kN. The study showed that with an increase in the compressive load in the considered range of values, the strength of weld joints increased, reached a maximum, and then decreased. The joints obtained at the compressive load of 6 kN demonstrated the highest lap shear strength of 1950 N. A zone of thermomechanical influence with a gradient microstructure is observed near the contact of the welded surfaces. In a layer with a thickness of 10–20 mm, the initial coarse-grained structure of nickel is transformed into an ultra-fine-grained one with a grain size of less than 1 mm. The ultra-fine-grained layer neighbors on crystallites, the size of which is several micrometers and increases with a distance from the contact surface of welded sheets. The authors compared the results of mechanical lap shear tests and structural studies with the data obtained after ultrasonic welding of nickel, aluminum, and copper alloys.
超声焊接(USW)是制造金属薄板固相连接的方法之一,未来可用于制备层合复合材料,用于增材制造和金属制品的翻新。接头的质量既取决于加工条件,也取决于焊接金属和合金的性能。目前,对强金属,特别是镍的USW条件、焊接接头的性能和结构的研究还不够充分。本文研究了压缩载荷量级对点焊法0.5 mm退火镍片搭接抗剪强度和接头结构的影响。在振动频率为20 kHz、振幅为15 μm的条件下,焊接时间为2 s。压缩载荷大小为3.5 ~ 7 kN。研究表明,在考虑值范围内,随着压缩载荷的增大,焊缝强度先增大,达到最大值后减小。当压缩载荷为6 kN时,接头的搭接抗剪强度最高,为1950 n。在焊接表面接触处,观察到具有梯度组织的热力学影响区。在厚度为10-20 mm的层中,镍的初始粗晶组织转变为晶粒尺寸小于1 mm的超细晶组织。超细晶粒层与晶粒相邻,晶粒尺寸为几微米,并随着距离焊片接触面的距离而增大。作者将机械搭接剪切试验和结构研究的结果与镍、铝和铜合金超声焊接后获得的数据进行了比较。
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引用次数: 0
EFFECT OF γ′-PHASE PARTICLES ON THE MECHANICAL BEHAVIOR AND DEFORMATION MECHANISM OF (CoCrFeNi)94Ti2Al4 HIGH ENTROPY ALLOY SINGLE CRYSTALS γ′相颗粒对(CoCrFeNi)94Ti2Al4高熵合金单晶力学行为及变形机制的影响
Pub Date : 2021-01-01 DOI: 10.18323/2073-5073-2021-3-84-90
A. Saraeva
Recently, the interest of researchers has focused on a new FCC class (FCC – face-centered cubic lattice) high-entropy alloys (HEA), due to their unique properties – high values of the strain hardening coefficient, good plasticity, and ductile fracture at low test temperatures. Such a combination of properties in an FCC of HEA is achieved by mixing five or more elements in equal atomic proportions. Due to the strong temperature dependence of stresses at the σ0.1(T) yield point, these alloys have low σ0.1 values at temperatures above room temperature, which hinders their practical application. A precipitation hardening is an effective way to achieve high strength and is successfully used for hardening HEA FCC. The paper studied the influence of ageing at 923 K for 4 hours and at 1073 K for 18 and 30 hours on the mechanical behavior of single crystals of (CoCrFeNi)94Ti2Al4 (at.%) HEA FCC oriented along the [001] direction under tension. Ageing at 923 K for 4 hours and at 1073 K for 18 and 30 hours leads to the precipitation of γ′-phase particles, the size and volume fraction of which depend on the ageing temperature and time. The γ′-phase particles precipitation leads to an increase in stresses at the yield point from 47 MPa (ageing at 923 K, 4 hours) to 226 MPa (ageing at 1073 K, 30 hours) relative to quenched crystals at 296 K. The study identified the dependence of the strain hardening coefficient, plasticity, and the maximum stress level before fracture on heat treatment. The author discussed the reasons for the growth of stresses at the yield point and the strain hardening coefficient upon precipitation of γ′-phase particles.
近年来,研究人员对一种新型FCC(面心立方晶格)高熵合金(HEA)感兴趣,因为它具有应变硬化系数高,塑性好,在低温下具有韧性断裂的独特性能。在HEA的催化裂化中,这种性质的组合是通过以相等的原子比例混合五种或五种以上的元素来实现的。由于应力在σ0.1(T)屈服点处的温度依赖性较强,这些合金在室温以上的温度下σ0.1值较低,阻碍了其实际应用。沉淀硬化是获得高强度的有效方法,已成功用于HEA FCC的硬化。本文研究了923 K时效4小时、1073 K时效18小时和30小时对(CoCrFeNi)94Ti2Al4 (at.%) HEA FCC单晶沿[001]方向拉伸的力学行为的影响。在923 K时效4 h,在1073 K时效18和30 h,析出γ′相颗粒,其大小和体积分数与时效温度和时效时间有关。γ′相颗粒的析出导致屈服点处的应力从47 MPa (923 K时效4小时)增加到226 MPa (1073 K时效30小时),相对于296 K淬火晶体。研究确定了应变硬化系数、塑性和断裂前最大应力水平与热处理的关系。讨论了γ′相颗粒析出时屈服点应力增大和应变硬化系数增大的原因。
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引用次数: 0
The influence of rolling and high-pressure torsion in the Bridgman chamber on the quantitative characteristics of shear bands in an amorphous Zr-based alloy Bridgman室中轧制和高压扭转对非晶zr基合金剪切带定量特性的影响
Pub Date : 2021-01-01 DOI: 10.18323/2073-5073-2021-2-67-74
I. Khriplivets
Amorphous alloys based on metal components demonstrate a unique ability to realize plastic deformation under the influence of external mechanical stresses. Influenced by substantial degrees of plastic deformation in alloys, one can observe shear bands (SB) in the form of rough lines on the polished surface of the sample. The concept of shear band formation in amorphous metallic glasses varies greatly from plastic deformation processes in crystalline metals and alloys. Unlike crystalline metals, amorphous metallic glasses can exist in a spectrum of structural states with accompanying mechanical, thermodynamic, and physical properties of materials. The formation and evolution of shear bands control the fluidity and plasticity of almost all metallic glasses at room temperature, and in many cases, the formation of dominant shear bands rapidly leads to failure. The literature does not contain any rigorous quantitative description of SB main parameters, which could adequately describe in the analytical form the process of plastic deformation of amorphous alloys, similar to the dislocation and disclination theories of plastic deformation of crystals. An open question remains how the transition from macroscopic deformation to severe plastic deformations of amorphous alloys affects the key SB characteristics. In this work, using the method of optical profilometry, the author studied in detail the quantitative characteristics of the steps formed by shear bands on the surface of deformed samples of the massive amorphous alloy Zr60Ti2Nb2Cu18.5Ni7.5Al10 after high-pressure torsion (HPT) and after rolling. The study identified that the design of shear bands depends on the deformation method and showed that the magnitude of deformation had the controlling effect on the shear bands thickness (the height of the steps). The transition from deformation by rolling (e=0.4) to plastic deformation during HPT (e=2.6) leads to the threefold increase in the power of shear bands and the average distance between them.
基于金属构件的非晶合金在外部机械应力的影响下表现出独特的塑性变形能力。受合金塑性变形程度的影响,在试样抛光表面可以观察到粗糙线条形式的剪切带(SB)。非晶金属玻璃中剪切带形成的概念与结晶金属和合金中的塑性变形过程有很大的不同。与结晶金属不同,非晶金属玻璃可以存在于具有机械、热力学和材料物理性质的结构状态光谱中。在室温下,剪切带的形成和演化控制着几乎所有金属玻璃的流动性和塑性,在许多情况下,优势剪切带的形成会迅速导致破坏。文献中没有对SB主要参数进行严格的定量描述,这与晶体塑性变形的位错和斜向理论类似,可以用解析的形式充分描述非晶合金的塑性变形过程。一个悬而未决的问题是,非晶合金从宏观变形到严重塑性变形的转变如何影响关键的SB特性。本文采用光学轮廓术的方法,详细研究了Zr60Ti2Nb2Cu18.5Ni7.5Al10块状非晶合金在高压扭转(HPT)和轧制后变形试样表面剪切带形成台阶的定量特征。研究确定了剪切带的设计取决于变形方法,并表明变形量对剪切带厚度(台阶高度)有控制作用。高温变形过程中,从轧制变形(e=0.4)到塑性变形(e=2.6)的转变导致剪切带的强度和剪切带之间的平均距离增加了3倍。
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