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Enhancement of Near-Field Radiative Heat Transfer based on High-Entropy Alloys 基于高熵合金的近场辐射传热强化
Pub Date : 2022-12-31 DOI: 10.33142/rams.v4i2.8463
Shan Deng, P. Song, Boxi Zhang, Sen Yao, Zhixin Jin, D. Guo
The enhancement of near-field radiative heat transfer (NFRHT) has now become one of the research hotspots in the fields of thermal management and imaging due to its ability to improve the performance of near-field thermoelectric devices and near-field imaging systems.  In this paper, we design three structures (multilayer structure, nanoporous structure, and nanorod structure) based on high-entropy alloys to realize the enhancement of NFRHT. By combining stochastic electrodynamics and Maxwell-Garnett's description of the effective medium, we calculate the radiative heat transfer under different parameters and find that the nanoporous structure has the largest enhancement effect on NFRHT. The near-field heat transfer factor (q) of this structure (q = 1.40×109 W/ (m2•K)) is three times higher than that of the plane structure (q = 4.6×108 W/ (m2•K)), and about two orders of magnitude higher than that of the SiO2 plate. This result provides a fresh idea for the enhancement of NFRHT and will promote the application of high-entropy alloy materials in near-field heat radiation.
增强近场辐射传热(NFRHT)可以提高近场热电器件和近场成像系统的性能,已成为热管理和成像领域的研究热点之一。本文设计了基于高熵合金的三种结构(多层结构、纳米多孔结构和纳米棒结构)来实现NFRHT的增强。结合随机电动力学和Maxwell-Garnett有效介质描述,计算了不同参数下的辐射换热,发现纳米孔结构对NFRHT的增强作用最大。该结构(q = 1.40×109 W/ (m2•K))的近场传热系数(q = 4.6×108 W/ (m2•K))是平面结构(q = 4.6×108 W/ (m2•K))的3倍,比SiO2板的近场传热系数(q = 4.6×108 W/ (m2•K))高约两个数量级。该结果为增强NFRHT提供了新的思路,将促进高熵合金材料在近场热辐射中的应用。
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引用次数: 0
Co47.5Fe28.•5Ni19Si3.3Al1.7 High-entropy Skeletons Fabricated by Selective Laser Melting and Properties tuned by pressure infiltration of Al 选择性激光熔化制备Co47.5Fe28.•5Ni19Si3.3Al1.7高熵骨架及Al压渗调整性能
Pub Date : 2022-12-31 DOI: 10.33142/rams.v4i2.8467
Yaqi Wu, Yongsen Cai, Jinpeng Hao, G. Geng, Yong Zhang
High saturation magnetization and low coercivity are required for soft magnetic materials. This study investigated the Co47.5Fe28.5Ni19Si3.3Al1.7 high-entropy soft magnetic skeleton was prepared by selective laser melting. Then Al was pressure infiltrated into skeletons to obtain a dense composite material. The high-entropy composite materials possessed favorable compressive ductility and moderate soft magnetic properties. The high-entropy composite materials were obtained with Ms being 97.1 emu/g, 79.8 emu/g, 33 emu/g and possessing 19 Oe, 15.8Oe and 17Oe of Hc, respectively. However, the magnetostriction coefficient remains low level, about 5ppm. These reported properties are attributed to the special structure of the material studied in present experiment. Nevertheless, a novel strategy of structural designing was proposed in this paper.
软磁材料需要高饱和磁化强度和低矫顽力。研究了采用选择性激光熔化法制备Co47.5Fe28.5Ni19Si3.3Al1.7高熵软磁骨架。然后将Al压入骨架中,得到致密的复合材料。高熵复合材料具有良好的压缩延展性和适中的软磁性能。复合材料的Ms分别为97.1 emu/g、79.8 emu/g、33 emu/g, Hc分别为19 Oe、15.8Oe和17Oe。然而,磁致伸缩系数仍然处于较低水平,约为5ppm。这些报告的性质归因于本实验所研究的材料的特殊结构。本文提出了一种新的结构设计策略。
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引用次数: 0
Structure evolution in undercooled CoCrNi medium entropy alloys by glass fluxing method 玻璃助熔法研究过冷CoCrNi中熵合金的组织演变
Pub Date : 2022-12-31 DOI: 10.33142/rams.v4i2.8464
Subo Yu, Sherstnev Aleksandr, Mikhail Markovskii, Daria Kataitseva, Gong Li
Undercooling of ternary CoCrNi medium entropy alloy (MEA) was achieved by molten glass fluxing method. The influence of undercooling on microstructure and mechanical properties of was investigated. The microstructure changes during the undercooling process identified by transmission electron microscope and scanning electron microscope shows that the grain size and intergranular phase all change after the undercooling treatment. The yield strength of the ternary MEA increased significantly after undercooling treatment, which attribute to the refined grain size and the formation of the new phase. Undercooling method can be used as a potential method to modify the microstructure and improve the mechanical properties of MEAs.
采用玻璃熔剂法实现了三元CoCrNi介质熵合金的过冷。研究了过冷对合金组织和力学性能的影响。透射电镜和扫描电镜观察过冷过程的显微组织变化表明,过冷处理后晶粒尺寸和晶间相都发生了变化。经过过冷处理后,三元MEA的屈服强度显著提高,这与晶粒细化和新相的形成有关。过冷方法可以作为一种潜在的方法来改变mea的组织,提高其力学性能。
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引用次数: 0
Effects of Nickel on the Microstructure, Mechanical properties and Corrosion Resistance of CoCrFeNixAl0.15Ti0.1 High Entropy Alloy 镍对CoCrFeNixAl0.15Ti0.1高熵合金组织、力学性能和耐蚀性的影响
Pub Date : 2022-12-31 DOI: 10.33142/rams.v4i2.8468
W. Qi, Yitian Su, X. Yang, Guannan Zha, Y. Zhao, Ya Zhang, Wenrui Wang
The present work investigates the effect of Ni on the microstructure, mechanical properties, and corrosion resistance of CoCrFeNixAl0.15Ti0.1 high-entropy alloys. It was found that the appropriate addition of Ni element in the alloy is beneficial to reduce the average grain size of the alloy. The yield strength and tensile strength of the alloy under fine-grain strengthening have also been increased, while the ductility of the system in this study has not been significantly affected. In terms of corrosion resistance, CoCrFeNixAl0.15Ti0.1 high-entropy alloys form a dense passive film at open circuit potential, possessing good corrosion resistance. However, with the excessive addition of Ni content in the alloy, the pitting corrosion resistance of the alloy in the environment of chloride ions will decrease due to the relative decrease of the relative content of Cr element. This work also can provide guidances for the design and development of new precipitation-strengthened CoCrFeNi-based high-entropy alloys with excellent comprehensive properties.
本文研究了Ni对cocrfenixal0.15 - ti0.1高熵合金组织、力学性能和耐蚀性的影响。结果表明,在合金中适当添加Ni元素有利于减小合金的平均晶粒尺寸。在细晶强化下,合金的屈服强度和抗拉强度也有所提高,而本研究体系的延展性并未受到明显影响。在耐蚀性方面,CoCrFeNixAl0.15Ti0.1高熵合金在开路电位下形成致密的钝化膜,具有良好的耐蚀性。但随着合金中Ni含量的过量加入,由于Cr元素相对含量的相对降低,合金在氯离子环境中的抗点蚀性能会下降。该研究也为设计和开发综合性能优异的新型沉淀强化cocrfeni基高熵合金提供了指导。
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引用次数: 0
The effect of binder phase content on WC-AlCoCrFeNiTi0.2 high entropy cemented carbides microstructure and mechanical properties 粘结剂相含量对WC-AlCoCrFeNiTi0.2高熵硬质合金组织和力学性能的影响
Pub Date : 2022-12-31 DOI: 10.33142/rams.v4i2.8465
Yuxin Wen, Mingchen Zhang, Yong Zhang
This work aims to explore WC-G201 high entropy cemented carbides properties fabricated by spark plasma sintering with AlCoCrFeNiTi0.2 and WC as binder phase and hard phase respectively. AlCoCrFeNiTi0.2 powder and WC powder were mixed at the mass ratio of 5: 95, 10: 90 and 15: 85 respectively, and then via SPS at 1300℃ for 5min. The results show that the binder phase has good wettability to WC, and with the increase of binder phase content, the hardness of the alloy decreases gradually, fracture toughness increases first and then decreases, the maximum value is 7.88 MPa m1/2. It is estimated that the comprehensive mechanical property of cemented carbides is the best when the binder content is between 5wt% and 10wt%.
研究了以alcocrfeni0.2和WC分别为粘结相和硬相的火花等离子烧结法制备WC- g201高熵硬质合金的性能。将AlCoCrFeNiTi0.2粉末与WC粉末分别按5:95、10:90和15:85的质量比混合,在1300℃下经SPS加热5min。结果表明:结合剂相对WC具有良好的润湿性,随着结合剂相含量的增加,合金硬度逐渐降低,断裂韧性先增大后减小,最大值为7.88 MPa m1/2;据估计,粘结剂含量在5wt% ~ 10wt%之间时,硬质合金的综合力学性能最好。
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引用次数: 1
Effect of electric pulse rolling on plastic forming ability of AZ91D magnesium alloy 电脉冲轧制对AZ91D镁合金塑性成形能力的影响
Pub Date : 2022-12-31 DOI: 10.33142/rams.v4i2.8466
Xinyu Liu, Yuezhang Zhou, Wenjie Bo, Yong Zhang, G. Geng
AZ91D magnesium alloy rolled under four rolling conditions, namely cold rolling, electric pulse cold rolling, hot rolling and electric pulse hot rolling, and the first principles calculation of Mg with or without external electric field carried out. The results show that: The application of pulse current in the rolling process of AZ91D magnesium alloy can effectively improve the edge crack of the sample, optimize the texture of AZ91D magnesium alloy and reduce its texture strength, promote the generation of tensile twins and the transition from small Angle grain boundaries to large Angle grain boundaries, and thus improve the plastic forming ability of AZ91D magnesium alloy. Make it more prone to plastic deformation. Compared with ordinary rolling, the microhardness of α-Mg matrix decreases by 15%. The tensile strength and elongation increased from 137MPa and 3.4% to 169MPa and 4.7%, respectively. The results show that the stiffness of Mg decreases and the Poisson's ratio of Mg increases when the electric field applies. When the B/G value is greater than 1.75, the plasticity of Mg is improved. The fault energy at the base surface of Mg does not change much, while the fault energy at the prismatic surface of Mg decreases obviously, showing the external electric field mainly affects the prismatic surface slip of Mg, which makes the prismatic surface slip easier to start, and thus improves the plastic forming ability of Mg.
AZ91D镁合金在冷轧、电脉冲冷轧、热轧和电脉冲热轧四种轧制条件下进行轧制,并对有无外加电场的Mg进行了第一性原理计算。结果表明:在AZ91D镁合金轧制过程中施加脉冲电流,可以有效改善试样的边缘裂纹,优化AZ91D镁合金的织构并降低其织构强度,促进拉伸孪晶的产生和小角度晶界向大角度晶界的转变,从而提高AZ91D镁合金的塑性成形能力。使其更容易发生塑性变形。与普通轧制相比,α-Mg基体的显微硬度降低了15%。拉伸强度和伸长率分别由137MPa和3.4%提高到169MPa和4.7%。结果表明:在外加电场作用下,Mg的刚度减小,泊松比增大;当B/G值大于1.75时,Mg的塑性得到改善。Mg基面断层能变化不大,棱柱面断层能明显减小,说明外电场主要影响Mg棱柱面滑移,使棱柱面滑移更容易启动,从而提高了Mg的塑性成形能力。
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引用次数: 0
Portable solar billboard 便携式太阳能广告牌
Pub Date : 2022-06-30 DOI: 10.33142/rams.v4i1.8459
Fangyue Zhao, Xinhua Yi, Jia Cai, Weishi Ma, Boyan Liu, Xinru Li, Y. Meng
Public bulletin boards are widely used in various public places, but due to the large size of the billboards, it is not easy to carry, and the traditional billboards are integrated, when the billboards need to be transferred, the limited storage space of the vehicle needs to be occupied It is extremely inconvenient, and at night, the traditional bulletin boards need to install additional light sources to illuminate them, which greatly increases energy consumption. Based on this paper designed a new structure of the bulletin board, this structure can make the bulletin board when not in use completely folded up and easy to carry, and in use can be completely unfolded and in the bottom of the added retractable support leg structure can be placed anywhere, and according to the terrain or human will to adjust the height. A solar panel is placed on the top of the bulletin board, which can store solar energy during the day and supply energy to the LED lights on the top at night for lighting, which saves energy and is very environmentally friendly.
公共公告牌广泛应用于各种公共场所,但由于广告牌体积较大,不便于携带,而传统的广告牌是一体化的,当广告牌需要搬运时,需要占用车辆有限的存储空间,极为不方便,而且在夜间,传统的公告牌需要安装额外的光源进行照明,大大增加了能耗。本文设计了一种新型的电子公告板结构,这种结构可以使电子公告板在不使用时完全折叠起来,便于携带,并且在使用时可以完全展开并在底部加装可伸缩的支腿结构,可以放置在任何地方,并可根据地形或人的意志来调节高度。布告栏顶部放置太阳能板,白天可以储存太阳能,晚上可以为顶部的LED灯供电照明,既节约能源,又非常环保。
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引用次数: 0
One dimensional terpyridine-based metal organic framework for stable supercapacitor 稳定型超级电容器的一维三元吡啶基金属有机骨架
Pub Date : 2022-06-30 DOI: 10.33142/rams.v4i1.8462
Haoxuan Feng, Weiqi Li, Chenyu Ma, Haiyan He
In summary, a novel structure of MOF based on 1,4–di ([2,2':6',2''terpyridin] -4'-yl)benzene and 1,4-naphthalenedicarboxylic acid has been constructed through hydrothermal reaction. The Ni-MOF displays one dimensional zigzag chain, which connect each other by hydrogen bonding to form three dimensional supramolecule with large channels. The conjugated systems of the terpyridin and benzene ligands enhance the chain rigidity, accelerate the electron transport. The massive channels provides electrolyte rapid transfer. By the structural feature aforementioned, the Ni-MOF demonstrates stable electrochemical performance as suprocapacitor.
综上所述,以1,4-二([2,2':6',2 "三联吡啶]-4'-基)苯和1,4-萘二羧酸为原料,通过水热反应构建了新型MOF结构。Ni-MOF呈一维之字形链,通过氢键相互连接,形成具有大通道的三维超分子。三元吡啶和苯配体的共轭体系增强了链的刚性,加速了电子的传递。大量的通道提供了电解质的快速转移。通过上述结构特征,Ni-MOF具有稳定的超级电容器电化学性能。
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引用次数: 0
Unsaturated transport properties of water molecules and ions in graphene oxide / hydrated calcium silicate nanochannels: from basic principles to complex environmental performance effects 氧化石墨烯/水合硅酸钙纳米通道中水分子和离子的不饱和输运特性:从基本原理到复杂的环境性能效应
Pub Date : 2022-06-30 DOI: 10.33142/rams.v4i1.8457
Zhuye Huang, Yong Feng, Hongwei Wang, Lei Fan
The problems of traditional concrete such as brittleness, poor toughness and short service life of concrete engineering under acid rain or marine environment need to be solved urgently. Hydrated calcium silicate (C-S-H) is a key component to improve the mechanical properties and durability of concrete. However, the traditional method of concrete material design based on empirical models or comparative tests has become a bottleneck restricting the sustainable development of concrete. The synthesis method, molecular structure and properties of C-S-H were systematically described in this paper; The interface structure and interaction of graphene oxide / calcium silicate hydrate (C-S-H / GO) were discussed. On this basis, the saturated and unsaturated transport characteristics of ions and water molecules in C-S-H / GO nanochannels under the environment of ocean and acid rain were introduced. The contents of this review provide the basis for improving the multi-scale transmission theory and microstructure design of concrete. It has important guiding significance for analyzing and improving the service life of concrete in complex environment.
传统混凝土在酸雨或海洋环境下易碎、韧性差、混凝土工程使用寿命短等问题亟待解决。水合硅酸钙(C-S-H)是提高混凝土力学性能和耐久性的关键成分。然而,传统的基于经验模型或对比试验的混凝土材料设计方法已经成为制约混凝土可持续发展的瓶颈。本文系统地介绍了C-S-H的合成方法、分子结构和性质;讨论了氧化石墨烯/水合硅酸钙(C-S-H / GO)的界面结构及其相互作用。在此基础上,介绍了海洋和酸雨环境下C-S-H / GO纳米通道中离子和水分子的饱和和不饱和输运特性。本文综述的内容为完善混凝土多尺度传输理论和混凝土微结构设计提供了依据。对分析和提高复杂环境下混凝土的使用寿命具有重要的指导意义。
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引用次数: 0
Efficient bio-assembled nanogenerator fabricated from chicken bone epidermis 利用鸡骨表皮制备高效生物组装纳米发电机
Pub Date : 2022-06-30 DOI: 10.33142/rams.v4i1.8460
Yan-ling Ma, Yongfa Wang, Li Li, Chunchang Wang
Using biological self-powered materials as a new energy source to replace traditional batteries to power micro-electronic devices is a current research hotspot. We herein fabricate a piezoelectric bio-nanogenerator from chicken bones. The nanogenerator can output a voltage of 1.25 V and a current of 9 nA after being subjected to a pressure of 30 N. This research facilitates an in-depth understanding of bio-nanogenerators and provides a new strategy for reusing bio-waste.
利用生物自供电材料作为新能源替代传统电池为微电子器件供电是当前的研究热点。我们在此用鸡骨制作了一个压电生物纳米发电机。在30 n的压力下,纳米发电机可以输出1.25 V的电压和9 nA的电流。该研究有助于深入了解生物纳米发电机,并为生物废物的再利用提供了新的策略。
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引用次数: 0
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Research and Application of Materials Science
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