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Effects of cold rolling path on recrystallization behavior and mechanical properties of pure copper during annealing
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作者 Jing CHEN Wen-jie XU +8 位作者 Jia-hao YANG Zhi YANG Hong-li SHI Gao-yong LIN Zhu-min LI Xu SHEN Bo JIANG Hui-qun LIU Kai-xuan GUI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第10期3233-3250,共18页
The recrystallization behavior,grain boundary characteristic distribution,and mechanical properties of pure Cu sheets that were subjected to different cold rolling paths,and then annealed at 400°C for 10,30,60,an... The recrystallization behavior,grain boundary characteristic distribution,and mechanical properties of pure Cu sheets that were subjected to different cold rolling paths,and then annealed at 400°C for 10,30,60,and 420 min,were investigated.Different rolling paths changed the grain boundary orientations of cold-rolled copper,causing recrystallized grains to nucleate and grow in an oriented manner.However,the evolution of the texture indicated that cold-rolled copper with different rolling paths did not show an obvious preferred orientation after annealing.The RD-60 specimen exhibited the smallest grain size(6.6μm).The results indicated that the grain size and low-ΣCSL grain boundaries worked together to provide RD-60 samples with appropriate mechanical properties and high plasticity.The yield strength,ultimate tensile strength,and elongation of RD-60 sample were 81 MPa,230 MPa,and 49%,respectively.These results could provide guidance for tuning the microstructures and properties of pure Cu foils,as well as designing fabrication routes for pure Cu foils through processes such as rolling and drawing. 展开更多
关键词 rolling path grain boundary characteristic distribution pure copper mechanical properties
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Effect of processing route on grain refinement in pure copper processed by equal channel angular extrusion 被引量:2
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作者 唐超兰 李豪 李赛毅 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第7期1736-1744,共9页
An experimental study of the microstructures in pure copper billets processed by 8 passes of equal channel angular extrusion (ECAE) via an extended range of processing routes with a 90° die is carried out. Each... An experimental study of the microstructures in pure copper billets processed by 8 passes of equal channel angular extrusion (ECAE) via an extended range of processing routes with a 90° die is carried out. Each processing route is defined according to the inter-pass billet rotation angle (χ), which varies from 0° to 180°. According to the generation of high-angle boundaries and reduction of grain size by electron backscatter diffraction (EBSD) measurements, the grain refinement is found to be most efficient for route with χ=90°and least efficient with χ=180°, among the seven routes studied. This trend is supported by supplementary transmission electron microscopy (TEM) measurements. Comparison of the EBSD and TEM data reveals the importance of considering the non-equiaxity of grain structures in quantitative assessment of microstructural differences in ECAE-processed materials. 展开更多
关键词 pure copper equal channel angular extrusion severe plastic deformation strain path grain refinement
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Primary-transient creep and anelastic backflow of pure copper deformed at low temperatures and ultra-low strain rates
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作者 申俊杰 Ken-ichi IKEDA +1 位作者 Satoshi HATA Hideharu NAKASHIMA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第7期1729-1735,共7页
Creep and anelastic backflow behaviors of pure copper (4N Cu) with grain size dg=40 μm were investigated at low temperatures of T〈0.3Tm (Tm is melting point) and ultra-low creep rates of ε≤1×10^-10 s^-1 b... Creep and anelastic backflow behaviors of pure copper (4N Cu) with grain size dg=40 μm were investigated at low temperatures of T〈0.3Tm (Tm is melting point) and ultra-low creep rates of ε≤1×10^-10 s^-1 by a high strain-resolution measurement (the helicoid spring specimen technique). Analysis of creep data was based on the scaling factors of creep curves instead of the conventional extrapolated steady-state creep rate. Power-law creep equation is suggested to be the best for describing the primary transient creep behavior, because the pre-parameter does not apparently change with elapsed time. The observed anelastic strains are 1/6 of the calculated elastic strains, and linear viscous behavior was identified from the logarithm plot of the anelastic strain rate versus anelastic strain (slope equals 1). Therefore, the creep anelasticity is suggested to be due to the unbowing of there-dimensional network of dislocations. 展开更多
关键词 pure copper CREEP DISLOCATION ANELASTICITY constitutive creep equation
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Effect of pulse magnetic field on solidification structure and properties of pure copper 被引量:7
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作者 LIAO Xi-liang GONG Yong-yong +2 位作者 LI Ren-xing CHEN Wen-jie ZHAI Qi-jie 《China Foundry》 SCIE CAS 2007年第2期116-119,共4页
The application of pulse magnetic field to metal solidification is an advanced technique which can remarkably refine solidification structure. In this paper, the effect of pulse magnetic field on solidification struct... The application of pulse magnetic field to metal solidification is an advanced technique which can remarkably refine solidification structure. In this paper, the effect of pulse magnetic field on solidification structure, mechanical properties and conductivity of pure copper was experimentally investigated. The results showed that the solidification structure transformed from coarse columnar crystal to fine globular crystal with increasing pulse voltage. Increasing pulse voltage also improved the tensile strength. However, with the increase of pulse voltage, the elongation and electrical resistivity firstly decreased, then increased when the pulse voltage beyond a critical value. Moreover, in some conditions, pulse magnetic field can simultaneously improve the conductivity and mechanical property of pure copper. 展开更多
关键词 pure copper pulse magnetic field solidification structure PROPERTY
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Effects of microrolling parameters on the microstructure and deformation behavior of pure copper 被引量:1
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作者 Yi Jing Hong-mei Zhang +3 位作者 Hao Wu Lian-jie Li Hong-bin Jia Zheng-yi Jiang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第1期45-52,共8页
Microrolling experiments and uniaxial tensile tests of pure copper under different annealing conditions were carried out in this paper. The effects of grain size and reduction on non-uniform deformation, edge cracking... Microrolling experiments and uniaxial tensile tests of pure copper under different annealing conditions were carried out in this paper. The effects of grain size and reduction on non-uniform deformation, edge cracking, and microstructure were studied. The experimen- tal results showed that the side deformation became more non-uniform, resulting in substantial edge bulge, and the uneven spread increased with increasing grain size and reduction level. When the reduction level reached 80% and the grain size was 65 μm, slight edge cracks occurred. When the grain size was 200 μm, the edge cracks became wider and deeper. No edge cracks occurred when the grain size was 200 μm and the reduction level was less than 60%; edge cracks occurred when the reduction level was increased to 80%. As the reduction level increased, the grains were gradually elongated and appeared as a sheet-like structure along the rolling direction; a fine lamellar structure was obtained when the grain size was 20 lam and the reduction level was less than 60%. 展开更多
关键词 micro-rolling grain size effect REDUCTION deformation behavior MICROSTRUCTURE pure copper
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Electrolytic Sampling from Pure Copper and Common Brasses Ⅰ: Calculation of the Mass Dissolved from the Samples according to Faraday's Law 被引量:2
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作者 Jin ZHANG Jian-Nan YANG(Chemistry Department, Liaoning University, Shenyang, 110036) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第2期167-170,共4页
In a procedure for electrolytic dissolving pure copper and common brasses, the approximate electrochemical mole mass(k) of the sample was determined in accordance with the brand of the sample, a stitable electrolyte w... In a procedure for electrolytic dissolving pure copper and common brasses, the approximate electrochemical mole mass(k) of the sample was determined in accordance with the brand of the sample, a stitable electrolyte was selected to make the current efficiency equal to 100%, and then the dissolved mass of samples was calculated according to Faraday's law(m=klt).Three representative samples were sampled by the electrolytic dissolution method and the calculated dissolved amounts were equal to the values by weighing the anode.The cxperimental results of zinc and copper in the anode liquor are in agreement with certified values. 展开更多
关键词 MASS Electrolytic Sampling from pure copper and Common Brasses Calculation of the Mass Dissolved from the Samples according to Faraday’s Law
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Microstructure and mechanical properties of laser welded joints of pure copper and 304 stainless steels 被引量:1
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作者 王刚 吴林志 +1 位作者 黄建茌 冯吉才 《China Welding》 EI CAS 2014年第3期69-72,共4页
A continuous wave diode laser with an output power of 2.8 kW was used to join pure copper and 304 stainless steel with a thickness of 1 mm. The focused laser beam with a diameter of O. 8 mm was irradiated on the coppe... A continuous wave diode laser with an output power of 2.8 kW was used to join pure copper and 304 stainless steel with a thickness of 1 mm. The focused laser beam with a diameter of O. 8 mm was irradiated on the copper side of the butt joints. In process of laser welding, effects of processing primary parameters on tensile strength of the joints were investigated. The interfacial characterizations of the joints were investigated by metallographic microscope, scanning electron microscope (SEM) and energy dispersive X-ray spectroscope (EDS). The results showed that the element diffusion and solution occur and metallurgical bonding was achieved between pure copper and 304 stainless steel. The maximum tensile strength of the joints was 209 MPa when the laser power of welding was 2. 4 kW and welding speed was 12 mm/s. 展开更多
关键词 laser welding MICROSTRUCTURE PROPERTIES pure copper 304 stainless steel
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Work hardening of adhesively bonded pure copper single lap joints 被引量:1
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作者 郑小玲 熊惟皓 +3 位作者 郑勇 余海洲 游敏 刘文俊 《中国有色金属学会会刊:英文版》 CSCD 2005年第S3期365-368,共4页
To explain the reason why work hardening occurs in epoxy adhesive bonded zone of pure copper adherends after tensile shear strength testing, an elasto-plastic finite element model was established to analyze the effect... To explain the reason why work hardening occurs in epoxy adhesive bonded zone of pure copper adherends after tensile shear strength testing, an elasto-plastic finite element model was established to analyze the effect of different adherends thickness of 2mm and 4mm on the shear strength as well as the level of work hardening in copper adherends of single lap joint. The numerical simulation results show that the axial or equivalent stress overrun the yield strength of the pure copper adherend is the main reason why the work hardening occurs on the bonded zone of the adherends after the shear strength testing. The elasto-plastic finite element simulation results are agreed with the experimental ones. The thicker its adherends are, the more serious the work hardening is. 展开更多
关键词 EPOXY pure copper LAP-SHEAR WORK HARDENING numerical simulation
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Inhomogeneity and anisotropy of microstructure and mechanical properties in severe plastic deformation processed pure copper 被引量:1
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作者 康锋 王经涛 杜忠泽 《中国有色金属学会会刊:英文版》 CSCD 2006年第A02期160-165,共6页
关键词 纯铜 多相性 各向异性 大塑性变形加工 显微结构 力学性质
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Effects of lanthanum addition on microstructure and mechanical properties of as-cast pure copper 被引量:15
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作者 陈岩 程明 +3 位作者 宋鸿武 张士宏 刘劲松 祝焱 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第11期1056-1063,共8页
As-cast Cu-La alloys with La contents in the range of 0–0.32 wt.% were fabricated by vacuum melting method. The effects of La on microstructure and mechanical properties of as-cast pure copper were investigated using... As-cast Cu-La alloys with La contents in the range of 0–0.32 wt.% were fabricated by vacuum melting method. The effects of La on microstructure and mechanical properties of as-cast pure copper were investigated using optical microscopy(OM), scanning electronic microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD) and tensile test. The results showed that La had obvious effects on the solidification microstructure and the grain refinement of as-cast pure copper. With the increase of La content, the ultimate tensile strength, the yield strength and the microhardness increased gradually, but the elongation increased first and then decreased while La content exceeded 0.089 wt.%. The improvement of mechanical properties was attributed to the effect of grain refinement strengthening, solid solution strengthening, second phase strengthening and purifying. However, excessive adding La would deteriorate the elongation owing to the excessive Cu6 La phases. 展开更多
关键词 as-cast pure copper La MICROSTRUCTURE mechanical property rare earths
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Dissimilar Joining of Pure Copper to Aluminum Alloy via Friction Stir Welding 被引量:7
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作者 Farhad Bakhtiari Argesi Ali Shamsipur Seyyed Ehsan Mirsalehi 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2018年第11期1183-1196,共14页
In this study, the dissimilar friction stir welding (FSW) butt joints between aluminum alloy 5754-H114 and commerciallypure copper were investigated. The thickness of welded plates was 4 mm and the aluminum plate wa... In this study, the dissimilar friction stir welding (FSW) butt joints between aluminum alloy 5754-H114 and commerciallypure copper were investigated. The thickness of welded plates was 4 mm and the aluminum plate was placed on theadvancing side. In order to obtain a suitable flow and a better material mixing, a 1-mm offset was considered for thealuminum plate, toward the butt centerline. For investigating the microstructure and mechanical properties of FSWedjoints, optical microscopy and mechanical tests (i.e., uniaxial tensile test and microhardness) were used, respectively.Furthermore, the analysis of intermetallic compounds and fracture surface was examined by scanning electron microscopyand X-ray diffraction. The effect of heat generation on the mechanical properties and microstructure of the FSWed jointswas investigated. The results showed that there is an optimum amount of heat input. The intermetallic compounds formedin FSWed joints were A14Cu9 and AI2Cu. The best results were found in joints with 1000 rpm rotational speed and100 mm/min travel speed. The tensile strength was found as 219 MPa, which reached 84% of the aluminum base strength.Moreover, maximum value of the microhardness of the stir zone (SZ) was attained as about 120 HV, which was greatlydepended on the grain size, intermetallic compounds and copper pieces in SZ. 展开更多
关键词 Friction stir welding 5754-H114 aluminum alloy pure copper Heat generation MICROSTRUCTURE Intermetallic compounds
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Effect of Initial Grain Size on the Hot Deformation Behavior and Microstructural Evolution of Pure Copper 被引量:1
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作者 H.R.Rezaei Ashtiani A.A.Shayanpoor 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2022年第4期662-678,共17页
The influences of initial grain size(IGS)with 20μm and 50μm on the hot flow behavior and microstructural changes of pure copper were investigated using hot compression tests at a temperature range of 623–1073 K and... The influences of initial grain size(IGS)with 20μm and 50μm on the hot flow behavior and microstructural changes of pure copper were investigated using hot compression tests at a temperature range of 623–1073 K and strain rate range of 0.001–0.1 s^(-1).The effects of critical stress and corresponding critical strain were studied based on the internal and external processing parameters.The critical stress and strain decreased with increasing temperature and decreasing strain rate.The investigation results of the microstructure and true strain–stress diagrams showed that dynamic recovery,dynamic recrystallization(DRX),and twinning mechanisms were caused during the hot deformation of pure copper.Microstructure evolution indicated some DRXed fine-grain took place around grain boundary of hot deformed samples with IGS of 20μm whereas DRXed fine-grain took place in interior grains for samples with larger IGS.The results also showed that grain growth is also dependent on IGS as the grain growth rate for samples with the larger IGS is greater than the smaller IGS.The critical strain rate and the temperature were obtained at 0.01 s^(-1) and 973 K,respectively,for the sudden change in the grain growth rate.Also,twinning highly depended on IGS which almost did not happen in fine grain size while the volume fraction of twinning increased with increasing grain size. 展开更多
关键词 Initial grain size Hot deformation pure copper Microstructure Dynamic recrystallization(DRX) TWINNING
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Evaluation of dynamic development of grain structure during friction stir welding of pure copper using a quasi in situ method 被引量:5
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作者 X.C.Liu Y.F.Sun +2 位作者 T.Nagira K.Ushioda H.Fujii 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第7期1412-1421,共10页
By employing a quasi in situ method, we investigated the dynamic evolution of the grain structure con-sidering the material flow, strain, and strain rate in the friction stir welding of pure copper. The tool' stop... By employing a quasi in situ method, we investigated the dynamic evolution of the grain structure con-sidering the material flow, strain, and strain rate in the friction stir welding of pure copper. The tool' stop action' and rapid cooling were employed and a brass foil was used as a marker to show the material flow path. The grain structure along the material flow path was characterised using electron backscatter diffraction. Static recrystallization occurs for the work-hardened base material in the preheating stage in front of the tool In the acceleration flow stage, grains are significantly refined by plastic deforma-tion, discontinuous dynamic recrystallization, annealing twinning during the strain-induced boundary migration and slight continuous dynamic recrystallization. In the deceleration flow stage, due to a strain reversal, the grain first coarsens, and is thereafter refined again. Finally, the hot-deformed material in the shoulder-affected zone is ‘frozen’ directly whereas that in the probe-affected zone undergoes signif-icant annealing;thus, the recrystallized microstructure and 45°-rotated cube texture are obtained in the probe-affected zone. 展开更多
关键词 Friction STIR welding GRAIN structure Material flow pure copper EBSD
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Microstructure and properties of pure iron/copper composite cladding layers on carbon steel 被引量:3
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作者 Long Wan Yong-xian Huang +2 位作者 Shi-xiong Lü Ti-fang Huang Zong-liang Lü 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第8期920-927,共8页
In the present study, pure iron/copper composite metal cladding was deposited onto carbon steel by tungsten inert gas welding. The study focused on interfacial morphological, microstructural, and mechanical analyses o... In the present study, pure iron/copper composite metal cladding was deposited onto carbon steel by tungsten inert gas welding. The study focused on interfacial morphological, microstructural, and mechanical analyses of the composite cladding layers. Iron liquid–solid-phase zones were formed at copper/steel and iron interfaces because of the melting of the steel substrate and iron. Iron concentrated in the copper cladding layer was observed to exhibit belt, globule, and dendrite morphologies. The appearance of iron-rich globules indicated the occurrence of liquid phase separation(LPS) prior to solidification, and iron-rich dendrites crystallized without the occurrence of LPS. The maximum microhardness of the iron/steel interface was lower than that of the copper/steel interface because of the diffusion of elemental carbon. All samples fractured in the cladding layers. Because of a relatively lower strength of the copper layer, a short plateau region appeared when shear movement was from copper to iron. 展开更多
关键词 tungsten inert gas welding metal cladding pure iron copper carbon steel interfacial properties
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Deoxidization effect of boron on the pure copper melting
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作者 王吉会 姜晓霞 李诗卓 《Chinese Science Bulletin》 SCIE EI CAS 1995年第7期605-608,共4页
The metal oxide dissolved in pure copper is usually cuprous oxide (Cu<sub>2</sub>O), so thedeoxidization of pure copper means the reduction of cuprous oxide to copper by addingdeoxidizers such as an elem... The metal oxide dissolved in pure copper is usually cuprous oxide (Cu<sub>2</sub>O), so thedeoxidization of pure copper means the reduction of cuprous oxide to copper by addingdeoxidizers such as an element. It is required that the oxide of this element must be morestable than Cu<sub>2</sub>O, i.e. its decomposition pressure is less than that of Cu<sub>2</sub>O. The more 展开更多
关键词 BORON pure copper DEOXIDIZATION melting.
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A gradient nano/micro-structured surface layer on copper induced by severe plasticity roller burnishing 被引量:5
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作者 赵婧 夏伟 +1 位作者 李宁 李风雷 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第2期441-448,共8页
In order to investigate a gradient nano/micro-structured surface layer on pure copper produced by severe plasticity roller burnishing (SPRB) and grain refinement mechanism, the microstructure characteristics and mat... In order to investigate a gradient nano/micro-structured surface layer on pure copper produced by severe plasticity roller burnishing (SPRB) and grain refinement mechanism, the microstructure characteristics and material properties of sample at various depths from the topmost surface were investigated by SEM, TEM, XRD, OM etc. The experimental results show that the gradient nano/micro-structure was introduced into the surface layer of over 100μm in thickness. The remarkable increase in hardness near the topmost surface was mainly attributed to the reduced grain size. The equiaxed nano-sized grains were in random orientation and the most of their boundaries were low-angle grain boundaries (LAGBs). The coarse grains are refined into the few micro-sized grains by dislocation activities;deformation twinning was found to be the primary form for the formation of submicron grains;the formation of nanostructure was dominated by dislocation activities accompanied with rotation of grains in local region. 展开更多
关键词 BURNISHING pure copper gradient nano/micro-structure surface nanocrystallization
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噻唑化合物对铜在硫酸中的缓蚀行为研究
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作者 陈文 林怡辰 +1 位作者 张旗麟 黄德兴 《楚雄师范学院学报》 2024年第3期50-54,共5页
利用失重法、极化曲线和电化学阻抗谱等方法研究2,5-二巯基-1,3,4-噻唑(DMTD)对纯铜在0.5 M的硫酸中的缓蚀作用。通过失重法研究缓蚀效果,并以其实验数据探讨吸附模型;采用极化曲线和电化学阻抗图谱研究缓蚀剂性能及机理。失重结果表明... 利用失重法、极化曲线和电化学阻抗谱等方法研究2,5-二巯基-1,3,4-噻唑(DMTD)对纯铜在0.5 M的硫酸中的缓蚀作用。通过失重法研究缓蚀效果,并以其实验数据探讨吸附模型;采用极化曲线和电化学阻抗图谱研究缓蚀剂性能及机理。失重结果表明四种实验温度下DMTD均可明显减缓纯铜在硫酸溶液中的腐蚀,DMTD分子吸附满足Langmuir等温线;电化学分析可知DMTD抑制纯铜阴阳极腐蚀反应;随着DMTD浓度的增大,吸附膜层缓蚀性能增强;表面形貌观察分别证实了DMTD的缓蚀作用。2,5-二巯基-1,3,4-噻唑(DMTD)可有效抑制纯铜在0.5 mol·L^(-1)的硫酸中的腐蚀。 展开更多
关键词 纯铜 硫酸 DMTD 吸附 缓蚀
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稀土Y对铜线材抗氧化行为的影响机理研究
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作者 葛晨阳 国秀花 +7 位作者 李韶林 宋克兴 周延军 刘海涛 张朝民 曹军 曹飞 高岩 《表面技术》 EI CAS CSCD 北大核心 2024年第10期144-155,共12页
目的针对纯铜线材的抗氧化性能不足问题,通过稀土微合金化制备了含微量Y元素的铜线材,研究稀土Y含量对铜线材抗氧化性能的影响。方法采用扫描电子显微镜(SEM)、EDS能谱仪和X射线衍射仪等表征手段,分析了氧化膜脱落后基体表面形貌以及稀... 目的针对纯铜线材的抗氧化性能不足问题,通过稀土微合金化制备了含微量Y元素的铜线材,研究稀土Y含量对铜线材抗氧化性能的影响。方法采用扫描电子显微镜(SEM)、EDS能谱仪和X射线衍射仪等表征手段,分析了氧化膜脱落后基体表面形貌以及稀土Y元素在氧化过程中的存在形式与氧化膜的生长过程,揭示了添加稀土元素Y提高纯铜抗氧化性能的作用机理。结果稀土Y的引入提高了纯铜线材的抗氧化性能,在600℃、10 h条件下,Cu-0.03Y线材相对于Cu线材氧化增重率由0.55%降低至0.2%,降幅达63%。稀土元素Y的添加使铜线材的(100)晶面占比减少,(111)晶面占比增多,基体表面易被活化的(100)原子面占比降低,铜线材的抗氧化性能提高。在Cu-0.1Y线材中稀土元素浓度较高时发生偏聚,稀土元素与氧的亲和力大于铜与氧的亲和力,偏聚处形成不连续的稀土氧化物,使氧离子与铜离子的接触反应面积增大,相比Cu-0.03Y线材抗氧化性能降低。结论氧化过程中稀土离子的扩散速率慢、半径大,对铜离子的向外扩散起到阻碍作用,降低了铜离子的扩散速度,提高了铜线材的抗氧化性能。 展开更多
关键词 纯铜线材 稀土元素Y 稀土氧化物 增重率 抗氧化性能
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蓝光激光熔覆纯铜覆层的组织及性能
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作者 宁晨红 高硕洪 +5 位作者 郑江鹏 王枭 杨军红 苏允海 刘敏 闫星辰 《材料导报》 EI CAS CSCD 北大核心 2024年第17期220-226,共7页
纯铜材料对红外波段的激光吸收率较低,难以进行传统红外激光熔覆,因此限制了纯铜材料在表面防护领域的应用。本研究采用蓝光激光熔覆技术制备纯铜涂层,通过理论计算结合实验验证获得了其制备工艺参数。随后对纯铜熔覆层的微观组织、显... 纯铜材料对红外波段的激光吸收率较低,难以进行传统红外激光熔覆,因此限制了纯铜材料在表面防护领域的应用。本研究采用蓝光激光熔覆技术制备纯铜涂层,通过理论计算结合实验验证获得了其制备工艺参数。随后对纯铜熔覆层的微观组织、显微硬度和摩擦磨损行为进行分析,并结合XRD和EDS研究了蓝光激光熔覆制备的纯铜涂层的元素分布和物相组成。结果表明:采用蓝光激光熔覆技术制备的纯铜材料具有较大的工艺窗口,可获得成形良好的熔覆层。蓝光激光熔覆后,熔覆界面处出现了明显的金属间化合物相NiCu_(4)以及FeCu_(4)。纯铜熔覆层的显微硬度小于基体材料,并且在结合界面存在明显的硬度变化过渡区域,因此涂层和基体之间的稀释区较大。在室温干摩擦磨损条件下,熔覆层的磨损行为以粘着磨损为主,磨粒磨损为辅,并且存在明显的氧化磨损。 展开更多
关键词 激光熔覆 蓝光激光 纯铜 微观组织 力学性能
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超/特高压直流输电工作环境中纯铜部件点蚀行为
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作者 何学敏 王贵山 +1 位作者 李应宏 史美娟 《粉末冶金技术》 CAS CSCD 北大核心 2024年第1期91-96,共6页
超/特高压输电是实现全球能源互联的核心技术。作为应用最广泛的输电系统导体材料,铜及铜合金的耐蚀性被重点关注。在超/特高压直流输电过程中,周围环境存在较大磁场,导致铜部件的服役环境与普通输电环境不同。采用动电位极化、电化学... 超/特高压输电是实现全球能源互联的核心技术。作为应用最广泛的输电系统导体材料,铜及铜合金的耐蚀性被重点关注。在超/特高压直流输电过程中,周围环境存在较大磁场,导致铜部件的服役环境与普通输电环境不同。采用动电位极化、电化学阻抗谱和元素分析等方法对纯铜在超/特高压环境下的电化学腐蚀行为进行了研究。结果表明:在超/特高压环境下,纯铜在3.5%NaCl溶液(质量分数)中的极限扩散电流高于无磁场条件下的极限扩散电流,并且无磁场条件下的反应电阻比施加了0.1 T磁场条件下的反应电阻明显提高。结合电化学阻抗谱、X射线衍射及元素分析可知,0.1 T磁场会使纯铜的耐蚀性降低,主要腐蚀产物为氧化亚铜。 展开更多
关键词 超/特高压直流输电 磁场 纯铜 耐蚀性 电化学
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