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Electrical Conductivity Behavior of the Aluminum Alloy 2024 during Artificial Aging 认领
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作者 Eduardo Luis Schneider and Thomas Gabriel Rosauro Clarke Daniel Diehl +2 位作者 Carlos Köhler Eduardo Luis Schneider Thomas Gabriel Rosauro Clarke 《材料科学与工程:中英文A版》 2020年第2期53-59,共7页
Precipitation-hardened aluminum alloys need to be heat treated to achieve the mechanical properties required for their application.The production of these materials can be optimized to make them more attractive and co... Precipitation-hardened aluminum alloys need to be heat treated to achieve the mechanical properties required for their application.The production of these materials can be optimized to make them more attractive and competitive comparing to other materials such as composites that have a growing and large market share in aeronautics field.One way to do this is by controlling the artificial aging of precipitation-hardenable aluminum alloys,such as the 2000 series Al-Cu alloys.These alloys can be monitored in real time by analyzing their conductivity behavior inside the furnace.The objective of this work is to evaluate the electrical conductivity behavior in real time of the 2024 alloy during the artificial aging at 190°C.For this,analyses were made in order to assess the behavior of the microhardness curve by aging time and its microstructural characterization with thermal treatments in the times of 1 h to 9 h interrupted every 1 h.The results of the electrical conductivity versus hardness curve showed a significant correlation and indicate that this measure has great potential to be used as a tool to control the thermal treatment of aging. 展开更多
关键词 Fur-terminal method heat treatment age hardening PRECIPITATION aluminum alloys aluminum 2024
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China Aluminum Association(CAA) And Nanning Municipal Government Co-build The Aluminum Industry Innovation Center 认领
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《中国有色金属月刊:英文版》 2020年第2期12-13,共2页
On January 7,China Aluminum Association(CAA)and Nanning Municipal Government held an official talk.Both sides carried out in-depth communication and exchange about the layout of aluminum intensive fabrication industry... On January 7,China Aluminum Association(CAA)and Nanning Municipal Government held an official talk.Both sides carried out in-depth communication and exchange about the layout of aluminum intensive fabrication industry development of Nanning,and the way to take advantages of respective resources to promote the rapid and sound development of aluminum intensive fabrication industry in Nanning. 展开更多
关键词 CAA China ALUMINUM ASSOCIATION The ALUMINUM Industry INNOVATION CENTER
中国铝产业的发展现状及展望 认领
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作者 佘欣未 蒋显全 +3 位作者 谭小东 郭胜锋 唐彬彬 潘复生 《中国有色金属学报》 EI CAS CSCD 北大核心 2020年第4期709-718,共10页
铝产业属于朝阳产业,具有蓬勃的生命力,是国内材料产业的重要组成部分。新时代我国铝产业正由高速发展转向高质量发展,既面临增速放缓、效益下滑的严峻考验,也呈现出结构优化、创新能力增强等积极变化。铝企业要主动控制运营成本,重视... 铝产业属于朝阳产业,具有蓬勃的生命力,是国内材料产业的重要组成部分。新时代我国铝产业正由高速发展转向高质量发展,既面临增速放缓、效益下滑的严峻考验,也呈现出结构优化、创新能力增强等积极变化。铝企业要主动控制运营成本,重视人才培养和装备升级,正确应对国际贸易摩擦;政府应积极引导铝产业健康发展,通过调整产业结构和优化产业布局,推动铝企业齐头并进、合作共赢。 展开更多
关键词 铝加工 产业现状 挑战 展望
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铝镓合金制氢技术研究进展 认领
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作者 赵飞燕 张小东 《有色金属:冶炼部分》 CAS 北大核心 2020年第1期60-65,共6页
氢气是最具发展潜力的二次能源,但储存和运输的高成本和低安全性是阻碍其应用的技术瓶颈。铝镓合金是一种集制备、存储为一体的长效能量储存模式,作为新型储氢材料的深度开发与利用而受到青睐。探讨了铝镓合金的反应机理,介绍了国内外... 氢气是最具发展潜力的二次能源,但储存和运输的高成本和低安全性是阻碍其应用的技术瓶颈。铝镓合金是一种集制备、存储为一体的长效能量储存模式,作为新型储氢材料的深度开发与利用而受到青睐。探讨了铝镓合金的反应机理,介绍了国内外铝镓合金的制备方法及研究进展,对未来的研究方向进行了展望。 展开更多
关键词 铝镓合金 产氢速率 制备方法 粉煤灰
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In situ observation of temperature-dependent atomistic and mesoscale oxidation mechanisms of aluminum nanoparticles 认领
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作者 Jing Gao Jingyuan Yan +2 位作者 Beikai Zhao Ze Zhang Qian Yu 《纳米研究:英文版》 SCIE EI CAS CSCD 2020年第1期183-187,共5页
Oxidation is a universal process causing metals’corrosion and degradation.While intensive researches have been conducted for decades,the detailed atomistic and mesoscale mechanisms of metal oxidation are still not we... Oxidation is a universal process causing metals’corrosion and degradation.While intensive researches have been conducted for decades,the detailed atomistic and mesoscale mechanisms of metal oxidation are still not well understood.Here using in situ environmental transmission electron microscopy(E-TEM)with atomic resolution,we revealed systematically the oxidation mechanisms of aluminum from ambient temperature to~600℃.It was found that an amorphous oxide layer formed readily once Al was exposed to air at room temperature.At~150℃,triangle-shaped Al2O3 lamellas grew selectively on gas/solid(oxygen/amorphous oxide layer)interface,however,the thickness of the oxide layer slowly increased mainly due to the inward diffusion of oxygen.As the temperature further increased,partial amorphous-to-crystallization transition was observed on the amorphous oxide film,resulting in the formation of highly dense nano-cracks in the oxide layer.At~600℃,fast oxidation process was observed.Lamellas grew into terraces on the oxide/gas interface,indicating that the high temperature oxidation is controlled by the outward diffusion of Al.Single or double/multi-layers of oxide nucleated at the corners of the terraces,forming denseγ’-Al2O3,which is a metastable oxide structure but may be stabilized at nanoscale. 展开更多
关键词 in situ transmission electron microscopy(TEM) aluminum oxidation temperature DIFFUSION
Development of gradient microstructure in the lattice structure of AlSi10Mg alloy fabricated by selective laser melting 认领
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作者 Mulin Liu Naoki Takata +1 位作者 Asuka Suzuki Makoto Kobashi 《材料科学技术:英文版》 SCIE EI CAS CSCD 2020年第1期106-117,共12页
To identify the microstructural features of the lattice structures of Al alloys built via the selective laser melting(SLM)process,AlSil OMg alloy with a body-centered cubic(BCC)-type lattice structure was prepared.Cha... To identify the microstructural features of the lattice structures of Al alloys built via the selective laser melting(SLM)process,AlSil OMg alloy with a body-centered cubic(BCC)-type lattice structure was prepared.Characteristic microstructures comprising melt pools with several columnarα-Al phases with<001>orientations along the elongation direction and surrounded by eutectic Si particles were observed at all portions of the built lattice structure.In the node portions of the lattice structure,a gradient microstructure(continuous change in microstructure)was observed.The columnarα-Al phases were observed near the top surface of the node portion,whereas they became coarser and more equiaxed near the bottom surface,resulting in softening localized near the bottom surface.In the strut portions of the lattice structure,the columnarα-Al phases were elongated along the inclined direction of struts.This trend was more prevalent near the bottom surface.Theα-Al phases became coarser and more equiaxed near the bottom surface as well.The aforementioned results were the basis of a discussion of the development of the gradient microstructure in lattice-structured Al alloys during the SLM process in terms of thermal conductivities at the boundaries between the manufactured(locally melted and rapidly solidified)portions and adjacent(unmelted)alloy powder. 展开更多
关键词 ADDITIVE manufacturing LATTICE structure Aluminum alloy MICROSTRUCTURE Thermal conductivity
In situ observation of the effect of Al N particles on bainitic transformation in a carbide-free medium carbon steel 认领
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作者 Xiao-jie Zhao Zhi-nan Yang Fu-cheng Zhang 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2020年第5期620-629,共10页
The bainitic transformation of the steels with different mass fractions of N, ~0.002% and 0.021%, was observed in situ by using high-temperature metalloscope. Micrometer-and nanometer-sized aluminum nitride(AlN) parti... The bainitic transformation of the steels with different mass fractions of N, ~0.002% and 0.021%, was observed in situ by using high-temperature metalloscope. Micrometer-and nanometer-sized aluminum nitride(AlN) particles were found in the steel with 0.021% N.Grain boundaries, the interior of the grains, and Al N particles were used as initial nucleation sites of bainitic ferrite, and bainitic ferrite subunits served as new nucleation sites to induce secondary nucleation. The lengthening rate of bainitic ferrite varied at different nucleation sites, which was controlled by the repeated nucleation and growth of bainitic subunits. The Al N particles not only provided several nucleation sites, but also increased the autocatalytic effect on the transformation, further shortening the incubation period, promoting the bainitic transformation, and refining the bainitic microstructure. 展开更多
关键词 bainitic steel In SITU OBSERVATION phase TRANSFORMATION aluminum NITRIDE
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Aluminum doping for optimization of ultrathin and high-k dielectric layer based on SrTiO3 认领
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作者 Ji-Ye Baek Le Thai Duy +1 位作者 Sang Yeon Lee Hyungtak Seo 《材料科学技术:英文版》 SCIE EI CAS CSCD 2020年第7期28-37,共10页
An ultrathin SrTiO3 dielectric layer is optimized through Al doping to solve the problems existing in development of ultra-high-k oxide MOS capacitors.Through post-deposition annealing,Al doping induces changes in the... An ultrathin SrTiO3 dielectric layer is optimized through Al doping to solve the problems existing in development of ultra-high-k oxide MOS capacitors.Through post-deposition annealing,Al doping induces changes in the electronic structure of SrTiO3,thereby effectively reducing leakage current to <10^-8 A/cm^2 at 0.5 MV/cm but maintains good capacitance values(ε> 80) of ultrathin SrTMO3 MOS capacitors.Strontium titanate(SrTiO3) is a high-k material but its bandgap is smaller than that of other oxide dielectrics(e.g.,SiO2,Al2 O3).Consequently,an ultrathin SrTiO3 film may have a high tunneling leakage current,which is not suitable for capacitor-based applications.To improve the performance of metal-oxide-semiconductor(MOS) capacitors using SrTiO3,an approach based on homogenous and uniform aluminum doping to SrTiO3 through co-sputtering is introduced.The bandgap of a pristine SrTiO3 film showed an increase of 0.5 eV after Al doping.Furthermore,Al doping decreased the leakage current of SrTiO3/Si-based MOS capacitors by more than five orders of magnitude(at the level of nanoampere per square centimeter).Importantly,a dielectric constant of 81.3 and equivalent oxide thickness less than 5 A were achieved in an 8-nm-thick Al-doped SrTiO3 film owing to changes in its crystal structure and conduction band edge electronic structure.Thus,the obtained data show the effectiveness of the proposed approach for solving the problems existing in the development of ultra-high-k oxide MOS capacitors. 展开更多
关键词 Aluminum doping SRTIO3 ULTRATHIN High dielectric constant MOS capacitors
Effect of Friction Coefficient on Deep Drawing of 6A16 Aluminum Alloy for Automobile Body 认领
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作者 刘钊扬 熊柏青 +4 位作者 LI Xiwu YAN Lizhen LI Zhihui ZHANG Yongan LIU Hongwei 《武汉理工大学学报:材料科学英文版》 SCIE EI CAS 2020年第1期208-214,共7页
Based on the ABAQUS/Explicit finite element method,the forming force changing trend of deep drawing test for 6A16 aluminum alloy plate after pre-aging and storage at room temperature for one month was simulated under ... Based on the ABAQUS/Explicit finite element method,the forming force changing trend of deep drawing test for 6A16 aluminum alloy plate after pre-aging and storage at room temperature for one month was simulated under friction coefficient ranging from 0 to 0.22.The lubricants selected for the tests were mechanical oil,butter and dry film lubricant,and the friction coefficient of these lubricants were 0.05,0.10 and 0.15,respectively.Microstructural evolution of 6 A16 aluminum alloy plate during drawing forming was investigated by OM,SEM and EBSD.The results showed that,with the increase of friction coefficient,the stress,strain and deformation degree in deformation zone increased,while the grain size in deformation zone decreased.Thus,the hardness of the cup-typed component increased with the increase of friction coefficient.Butter-lubricated cups had the highest tensile strength and yield strength after paint-bake cycle.The combination of simulation results and microstructure analysis of 6A16 aluminum alloy plate after drawing forming indicates that the appropriate lubricant is butter. 展开更多
关键词 finite element method 6A16 aluminum alloys DEEP DRAWING test FRICTION COEFFICIENT
Effect of Trace Addition of Ceramic on Microstructure Development and Mechanical Properties of Selective Laser Melted AlSi10Mg Alloy 认领
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作者 Yuxin Li Dongdong Gu +1 位作者 Han Zhang Lixia Xi 《中国机械工程学报:英文版》 SCIE EI CAS CSCD 2020年第2期56-68,共13页
Selective laser melting(SLM)is an emerging additive manufacturing technology for fabricating aluminum alloys and aluminum matrix composites.Nevertheless,it remains unclear how to improve the properties of laser manufa... Selective laser melting(SLM)is an emerging additive manufacturing technology for fabricating aluminum alloys and aluminum matrix composites.Nevertheless,it remains unclear how to improve the properties of laser manufactured aluminum alloy by adding ceramic reinforcing particles.Here the effect of trace addition of TiB2 ceramic(1%weight fraction)on microstructural and mechanical properties of SLM-produced AlSi10Mg composite parts was investigated.The densification level increased with increasing laser power and decreasing scan speed.A near fully dense composite part(99.37%)with smooth surface morphology and elevated inter-layer bonding was successfully obtained.A decrease of lattice plane distance was identified by X-ray diffraction with the laser scan speed decreased,which implied that the crystal lattices were distorted due to the dissolution of Si and TiB2 particles.A homogeneous composite microstructure with the distribution of surface-smoothened TiB2 particles was present,and a small amount of Si particles precipitated at the interface between reinforcing particles and matrix.In contrast to the AlSi10Mg alloy,the composites showed a stabilized microhardness distribution.A higher ultimate tensile strength of 380.0 MPa,yield strength of 250.4 MPa and elongation of 3.43%were obtained even with a trace amount of ceramic addition.The improvement of tensile properties can be attributed to multiple mechanisms including solid solution strengthening,load-bearing strengthening and dispersion strengthening.This research provides a theoretical basis for ceramic reinforced aluminum matrix composites by additive manufacturing. 展开更多
关键词 Selective laser melting TIB2 Aluminum matrix composites Mechanical properties Strengthening mechanism
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不同种类AA7075-AA5754合金冷态金属转移焊的腐蚀行为和力学性能 认领
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作者 Nilay??MEZ Hülya DURMU? 《中南大学学报:英文版》 SCIE EI CAS CSCD 2020年第1期18-26,共9页
冷金属转移(CMT)焊接是一种全新的电弧焊技术,在薄板及异种材料的焊接中取得了良好的效果。不同类型铝接头的腐蚀行为应根据腐蚀介质对其结构可能造成的失效的影响来进行预测。研究了热输入对ER5356焊丝CMT焊接的AA5754-AA7075接头力学... 冷金属转移(CMT)焊接是一种全新的电弧焊技术,在薄板及异种材料的焊接中取得了良好的效果。不同类型铝接头的腐蚀行为应根据腐蚀介质对其结构可能造成的失效的影响来进行预测。研究了热输入对ER5356焊丝CMT焊接的AA5754-AA7075接头力学性能和腐蚀速率的影响。在焊缝金属和AA7075基体金属的部分熔化区都可观察到气孔的形成,这是由于锌的蒸发作用造成的。随着热输入的增加,AA7075基体金属发生过时效和锌汽化,AA5754基体金属晶粒粗化,从而降低了抗拉强度。AA7075-AA5754接头的平均抗拉强度在235~240MPa。所有样品中,塑性断裂均发生在AA5754母材一侧。腐蚀机理以点蚀为主。随着热输入的增加,耐蚀性逐渐增强。为优化耐腐蚀性和强度,建议热输入值在95至110 J/mm之间。 展开更多
关键词 AA5754合金 AA7075合金 腐蚀 Tafel曲线 拉伸强度 异种焊接
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氧化锆负载双金属复合催化剂的制备与性能表征 认领
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作者 郭一然 侯怡劭 +5 位作者 孟蓬 杨帆 陈宇 刘雯 贾士芳 石国亮 《煤化工》 CAS 2020年第2期44-47,共4页
以硝酸铝为助剂,硝酸铜为铜物种前驱体,正丁醇锆为载体前驱体,采用蒸汽水解法一步合成出了具有纯四方相结构的负载型介孔Al-Cu/ZrO2复合双金属催化剂。通过对复合催化剂进行XRD、N2吸附、H2-TPR等表征,分析了不同铝助剂含量和铜含量对... 以硝酸铝为助剂,硝酸铜为铜物种前驱体,正丁醇锆为载体前驱体,采用蒸汽水解法一步合成出了具有纯四方相结构的负载型介孔Al-Cu/ZrO2复合双金属催化剂。通过对复合催化剂进行XRD、N2吸附、H2-TPR等表征,分析了不同铝助剂含量和铜含量对复合催化剂结构性能的影响规律。结果表明,当铝助剂质量分数为3%、铜质量分数为20%时,复合催化剂具有良好的晶相结构,比表面积可达100 m^2/g,铜物种还原温度为175℃~238℃且与氧化锆载体表面之间相互作用强、分散性高。 展开更多
关键词 氧化锆 双金属催化剂 蒸汽水解法 性能 表征
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铝与温度对六堡茶茶叶品质的影响 认领
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作者 叶锦培 黄爱萍 +4 位作者 唐世斌 黎植强 李晓丽 聂海泉 陈仕香 《湖北农业科学》 2020年第3期97-101,共5页
以六堡茶群体种扦插苗为材料,在水培条件下设置不同铝浓度(0、50、100、200、400 mg/L)和温度(5、15、25℃)处理六堡茶苗,研究铝和低温对茶叶干物质、游离氨基酸、茶多酚、茶多糖和水浸物含量的影响。结果表明,除了干物质外,其他物质含... 以六堡茶群体种扦插苗为材料,在水培条件下设置不同铝浓度(0、50、100、200、400 mg/L)和温度(5、15、25℃)处理六堡茶苗,研究铝和低温对茶叶干物质、游离氨基酸、茶多酚、茶多糖和水浸物含量的影响。结果表明,除了干物质外,其他物质含量随铝浓度先增加后降低,铝浓度对干物质、游离氨基酸和水浸物含量的影响较小,各处理间无显著差异;适量铝对茶叶品质有一定促进,以100 mg/L处理促进作用较为明显,但铝过量会影响茶叶品质。除了茶多酚和水浸物外,温度对干物质、游离氨基酸和茶多糖含量影响较小,各处理间没有显著差异;5℃处理的茶叶干物质和茶多酚略低于25℃处理,游离氨基酸、茶多糖和水浸物则是5℃和15℃处理高于25℃处理,尤其5℃的茶多糖和水浸物;温度对六堡茶茶叶品质有一定影响。不同浓度铝或温度处理六堡茶,茶叶品质会发生一定程度的改变。 展开更多
关键词 温度 茶叶品质 六堡茶
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The Chinese Automobile Industry Aluminum Consumption Assessment Report Issued 认领
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《中国有色金属月刊:英文版》 2020年第2期1-4,共4页
The Chinese Automobile Industry Aluminum Consumption Assessment Report(2016—2030)was issued recently.The Report describes the comprehensive assessment results of the Chinese auto industry,covering passenger vehicles,... The Chinese Automobile Industry Aluminum Consumption Assessment Report(2016—2030)was issued recently.The Report describes the comprehensive assessment results of the Chinese auto industry,covering passenger vehicles,commercial vehicles(buses and trucks),special purpose vehicles,two-wheelers,three-wheelers. 展开更多
关键词 The Chinese AUTOMOBILE INDUSTRY ALUMINUM CONSUMPTION ASSESSMENT
微波消解-比色法测定食品中的铝 认领
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作者 谭亚男 马伟 陆阳 《食品工业》 CAS 北大核心 2020年第1期281-284,共4页
样品经微波消解后,铬天青S与铝离子反应产生蓝绿色胶束,通过分光光度法可测定样品中的铝的含量。该方法检出限为0.5 mg/kg,在0~5μg/25 mL范围内,线性相关性好,大于0.9990,RSD小于8%(n=6)。加标浓度在20~60 mg/kg范围内,回收率为95.5%~1... 样品经微波消解后,铬天青S与铝离子反应产生蓝绿色胶束,通过分光光度法可测定样品中的铝的含量。该方法检出限为0.5 mg/kg,在0~5μg/25 mL范围内,线性相关性好,大于0.9990,RSD小于8%(n=6)。加标浓度在20~60 mg/kg范围内,回收率为95.5%~101.1%,与原方法比较,结果无明显差异,其精密度更高。该方法采用微波消解,简化了样品前处理方式,用塑料离心管代替玻璃比色管不仅缩短了试验前期准备时间,还降低了引入污染的概率,可用于含铝食品添加剂的食品的批量检验。 展开更多
关键词 微波消解 分光光度法 铬天青
挤压型材焊缝质量评价的实验方法比较 认领
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作者 B.REGGIANI L.DONATI 《中国有色金属学报:英文版》 SCIE EI CAS CSCD 2020年第3期619-634,共16页
为了评估两种挤压速度下的管状型材的焊缝强度,比较楔形膨胀和胀形膨胀试验方法。在楔形试验中,膨胀是通过将锥形冲头插入管中直至试样破裂来确定。在胀形试验中,通过试样内部橡胶塞膨胀来施加静拉伸应力状态。通过检测断口形貌和断口位... 为了评估两种挤压速度下的管状型材的焊缝强度,比较楔形膨胀和胀形膨胀试验方法。在楔形试验中,膨胀是通过将锥形冲头插入管中直至试样破裂来确定。在胀形试验中,通过试样内部橡胶塞膨胀来施加静拉伸应力状态。通过检测断口形貌和断口位置,比较两种方法在断口处的载荷和环向应变。为了评估标准测试条件的可靠性,研究若干设计参数的影响。结果表明,在两种试验中,焊缝位置均出现韧性断裂,但胀形试验相对于楔形试验更为稳健和保守,数据分散性较小。因此,通过胀形试验成功评估为优化焊缝质量而设计的第二种管状型材的性能,所得结果与一种新的数值质量指数所获得的结果进行比较,最终达到良好的匹配。 展开更多
关键词 膨胀试验 焊缝 挤压 胀形试验 楔形试验
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微纳复合结构超疏水铝表面抑霜特性研究 认领
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作者 鲁祥友 潘雨阳 谢远来 《表面技术》 EI CAS CSCD 北大核心 2020年第3期106-111,140共7页
目的从微观上揭示超疏水表面的抑霜机理。方法运用化学刻蚀法制备微纳复合结构超疏水铝表面,在制冷实验台上对试件结霜过程进行微观可视化观测,并分析试件的霜晶演化规律。将超疏水铝片冷面温度分别设置为–5、–10、–15℃三个档次,通... 目的从微观上揭示超疏水表面的抑霜机理。方法运用化学刻蚀法制备微纳复合结构超疏水铝表面,在制冷实验台上对试件结霜过程进行微观可视化观测,并分析试件的霜晶演化规律。将超疏水铝片冷面温度分别设置为–5、–10、–15℃三个档次,通过对比普通铝片和超疏水铝片表面的霜晶高度与霜晶质量,结合相变动力学、经典成核理论、传热与传质理论解释相关结霜与抑霜机理。结果不同的实验阶段及不同的实验温度条件下,超疏水铝表面本身的抑霜效果虽然有差异,但是相比普通铝表面的抑霜特性,超疏水铝表面都具有一定的抑霜效果,结霜过程整体滞后,霜层高度发展相对缓慢,实验进行了10min后,超疏水表面的霜层高度只有普通表面的35%。结论由于冷凝水珠在冷表面形成Wenzel状态,水珠浸润在微细结构中,在一定的条件下,超疏水铝表面可有效延缓冷凝水珠的生成,从而抑制结霜。在结霜后期,当冷凝水珠冻结,且在表面布满霜晶后,抑霜效果相对恶化。在经月桂酸修饰后,普通铝表面也具有一定的抑霜性能,但效果明显弱于具有微纳复合结构的超疏水表面,因此建议在制作表面有抑霜需求的材料时,可以以延缓冷凝水珠的生成为技术手段,制作合适的表面微纳结构,以期达到最大程度地抑霜的目的。 展开更多
关键词 凝结 传热 微纳结构 霜晶 疏水
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Effect of ladle outlet geometry on internal porosity in gravity casting automotive brackets: An experimental investigation 认领
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作者 Jaehoon Choi Hoyoung Hwang Shinill Kang 《中国铸造:英文版》 SCIE 2020年第1期56-60,共5页
This study investigated whether the pouring ladle's outlet shape could reduce the porosity of aluminum alloy casting products and whether it could be applied to mass production of automotive brackets based on comp... This study investigated whether the pouring ladle's outlet shape could reduce the porosity of aluminum alloy casting products and whether it could be applied to mass production of automotive brackets based on computer simulations and experiment.The filling behaviors of the melt were simulated to compare the flow characteristics of the molten metal poured from the conventional ladle and the proposed ladle.Results show that for the conventional ladle,the pouring metal is V-shaped,while it is relatively circular and poured at a more constant rate in the proposed ladle.CT scans reveal that the proposed ladle reduces the porosity of the cast product.The proposed ladle resulted in an average of 30 fewer pores,a 299.56 mm3 smaller average total pore volume,and a 0.041% lower difference in average porosity.It is concludes that the proposed ladle can be used in the gravity casting process.By changing the ladle outlet shape can reduce the casting failure rate of massproduced automobile bracket. 展开更多
关键词 aluminum alloy POURING LADLE gravity CASTING POROSITY
环保型PSiAT-CMC复合絮凝剂的制备及净水性能研究 认领
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作者 张浩 李晓双 +3 位作者 王润楠 王希越 祝波 娄大伟 《水处理技术》 CAS CSCD 北大核心 2020年第5期41-45,51,共6页
再以硅酸钠、硫酸铝、硫酸钛、羧甲基纤维素为原料制备聚硅酸铝钛-纤维素(PSiAT-CMC)絮凝剂,通过单因素实验方法考察了n(Al+Ti)/n(Si)、n(Ti)/n(Al)、m(CMC)/m(Si)及投加量的最佳值。采用扫描电镜和傅里叶变换红外光谱分析对絮凝剂进行... 再以硅酸钠、硫酸铝、硫酸钛、羧甲基纤维素为原料制备聚硅酸铝钛-纤维素(PSiAT-CMC)絮凝剂,通过单因素实验方法考察了n(Al+Ti)/n(Si)、n(Ti)/n(Al)、m(CMC)/m(Si)及投加量的最佳值。采用扫描电镜和傅里叶变换红外光谱分析对絮凝剂进行表征,并与聚硅酸铝进行了絮凝效果对比。实验证明纤维素与聚硅酸铝钛盐成功复合,PSiAT-CMC复合絮凝剂扩大了絮凝剂适用范围,提高了稳定性及絮凝性能。 展开更多
关键词 复合絮凝剂 聚硅酸 纤维素
Relationship Between Microstructures and Microhardness in High-Speed Friction Stir Welding of AA6005A-T6 Aluminum Hollow Extrusions 认领
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作者 Xiang-Qian Liu Hui-Jie Liu Yan Yu 《金属学报:英文版》 SCIE EI CAS CSCD 2020年第1期115-126,共12页
AA6005 A-T6 aluminum hollow extrusions were friction stir welded at a fixed high welding speed of 2000 mm/min and various rotation speeds.The results showed that the heat-aff ected zone(HAZ)retained the similar grain ... AA6005 A-T6 aluminum hollow extrusions were friction stir welded at a fixed high welding speed of 2000 mm/min and various rotation speeds.The results showed that the heat-aff ected zone(HAZ)retained the similar grain structure as the base material except some grain coarsening,and the density of dislocations andβ′precipitates were almost unchanged,indicating that the high welding speed inhibited the coarsening and dissolution ofβ″precipitates via fast cooling rate.The thermo-mechanically aff ected zone(TMAZ)was characterized by elongated and rotated grains,in which a low density ofβ′precipitates and the highest density of dislocations were observed.The highest heat input and severest plastic deformation occurring in the nugget zone(NZ)resulted in the occurrence of dynamic recrystallization and a high density of dislocations.Hence,all theβ″precipitates and most of theβ′precipitates dissolved into the matrix,and a fewβ′precipitates were transformed intoβprecipitates.The microhardness was controlled by the precipitation and solution strengthening in the HAZ,by the dislocation and precipitation strengthening in the TMAZ,and by the fine-grain and dislocation strengthening in the NZ.With the increase in rotation speed,the peak and the lowest microhardness value increased monotonously. 展开更多
关键词 ALUMINUM HOLLOW extrusions HIGH-SPEED friction stir welding Grain structure Dislocation and PRECIPITATES MICROHARDNESS distribution
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