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Evolution of mechanical properties,localized corrosion resistance and microstructure of a high purity Al-Zn-Mg-Cu alloy during non-isothermal aging
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作者 DAI Xuan-xuan LI Yu-zhang +2 位作者 LIU Sheng-dan YE Ling-ying BAO Chong-jun 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第6期1790-1807,共18页
The evolution of mechanical properties,localized corrosion resistance of a high purity Al-Zn-Mg-Cu alloy during non-isothermal aging(NIA)was investigated by hardness test,electrical conductivity test,tensile test,inte... The evolution of mechanical properties,localized corrosion resistance of a high purity Al-Zn-Mg-Cu alloy during non-isothermal aging(NIA)was investigated by hardness test,electrical conductivity test,tensile test,intergranular corrosion test,exfoliation corrosion test,slow strain rate tensile test and electrochemical test,and the mechanism has been discussed based on microstructure examination by optical microscopy,electron back scattered diffraction,scanning electron microscopy and scanning transmission electron microscopy.The NIA treatment includes a heating stage from 40℃to 180℃with a rate of 20℃/h and a cooling stage from 180℃to 40℃with a rate of 10℃/h.The results show that the hardness and strength increase rapidly during the heating stage of NIA since the increasing temperature favors the nucleation and the growth of strengthening precipitates and promotes the transformation of Guinier-Preston(GPI)zones toη'phase.During the cooling stage,the sizes ofη'phase increase with a little change in the number density,leading to a further slight increase of the hardness and strength.As NIA proceeds,the corroded morphology in the alloy changes from a layering feature to a wavy feature,the maximum corrosion depth decreases,and the reason has been analyzed based on the microstructural and microchemical feature of precipitates at grain boundaries and subgrain boundaries. 展开更多
关键词 Al-Zn-Mg-Cu alloy non-isothermal aging mechanical properties localized corrosion resistance MICROSTRUCTURE
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Effect of interrupted aging on mechanical properties and corrosion resistance of 7A75 aluminum alloy
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作者 Xian-wen YANG Ling-ying YE +1 位作者 Yong ZHANG Quan-shi CHENG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第8期2415-2430,共16页
The effects of interrupted aging on mechanical properties and corrosion resistance of 7A75 aluminum alloy extruded bar were investigated through various analyses,including electrical conductivity,mechanical properties... The effects of interrupted aging on mechanical properties and corrosion resistance of 7A75 aluminum alloy extruded bar were investigated through various analyses,including electrical conductivity,mechanical properties,local corrosion properties,and slow strain rate tensile stress corrosion tests.Microstructure characterization techniques such as metallographic microscopy,scanning electron microscopy(SEM),and transmission electron microscopy(TEM)were also employed.The results indicate that the tensile strength of the alloy produced by T6I6 aging is similar to that produced by T6I4 aging,and it even exceeds 700 MPa.Furthermore,the yield strength increases by 52.7 MPa,reaching 654.8 MPa after T6I6 aging treatment.The maximum depths of intergranular corrosion(IGC)and exfoliation corrosion(EXCO)decrease from 116.3 and 468.5μm to 89.5 and 324.3μm,respectively.The stress corrosion factor also decreases from 2.1%to 1.6%.These findings suggest that the alloy treated with T6I6 aging exhibits both high strength and excellent stress corrosion cracking resistance.Similarly,when the alloy is treated with T6I4,T6I6 and T6I7 aging,the sizes of grain boundary precipitates(GBPs)are found to be 5.2,18.4,and 32.8 nm,respectively.The sizes of matrix precipitates are 4.8,5.7 and 15.7 nm,respectively.The atomic fractions of Zn in GBPs are 9.92 at.%,8.23 at.%and 6.87 at.%,respectively,while the atomic fractions of Mg are 12.66 at.%,8.43 at.%and 7.00 at.%,respectively.Additionally,the atomic fractions of Cu are 1.83 at.%,2.47 at.%and 3.41 at.%,respectively. 展开更多
关键词 7A75 aluminum alloy interrupted aging aging precipitation behavior mechanical properties intergranular corrosion exfoliation corrosion stress corrosion cracking
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Effect of Accelerated Aging Temperature under Artificial Seawater on the Properties of Carbon Fiber/Epoxy Composites and the Erosion Mechanism
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作者 XU Jinwei LU Yunfei +3 位作者 DING He DENG Zongyi SHI Minxian HUANG Zhixiong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2024年第6期1365-1371,共7页
In order to explore the effect of artificial accelerated aging temperature on the performance of carbon fiber/epoxy resin composites,we used artificial seawater as the aging medium,designed the aging environment of se... In order to explore the effect of artificial accelerated aging temperature on the performance of carbon fiber/epoxy resin composites,we used artificial seawater as the aging medium,designed the aging environment of seawater at different temperatures under normal pressure,and studied the aging behavior of carbon fiber/epoxy composites.The infrared spectroscopy results show that,with the increase of aging temperature,the degree of hydrolysis of the composite is greater.At the same time,after 250 days of aging of artificial seawater at regular temperature,40 and 60 ℃,the moisture absorption rates of composite materials were 0.45%,0.63%,and 1.05%,and the retention rates of interlaminar shear strength were 91%,78%,and 62%,respectively.It is shown that the temperature of the aging environment has a significant impact on the hygroscopic behavior and mechanical properties of the composite,that is,the higher the temperature,the faster the moisture absorption of the composite,and the faster the decay of the mechanical properties of the composite. 展开更多
关键词 carbon fiber/epoxy composites artificial seawater aging temperature moisture absorption mechanical properties
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Effect of Residual Maleic Anhydride in PP-g-MAH on the Thermo-Oxidative Aging Properties of RGF-PP 被引量:1
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作者 Junjie Tang Pengwei Shi +2 位作者 Hao Duan Kwang-Yoon Kim Minqi Xin 《Journal of Materials Science and Chemical Engineering》 2017年第7期61-70,共10页
The mechanical, morphological and thermo-oxidative aging properties of the glass fiber reinforced polypropylene (RGF-PP) were studied based on four different maleic anhydride grafted polypropylene (PP-g-MAH) compatibi... The mechanical, morphological and thermo-oxidative aging properties of the glass fiber reinforced polypropylene (RGF-PP) were studied based on four different maleic anhydride grafted polypropylene (PP-g-MAH) compatibilizers with different content of residual maleic anhydride (MAH). It was shown that PP-g-MAH compatibilizer could significantly improve the mechanical properties of RGF-PP, while from thermal and morphological analysis results, the content of residual MAH had negative influence on long term thermo- oxidative aging properties of RGF-PP with adding PP-g-MAH compatibilizer;the lower the residual content of MAH is, the better the thermo stability of the PP-g-MAH is, and also the better the thermo-oxidative aging properties was obtained. 展开更多
关键词 RESIDUAL Maleic ANHYDRIDE Maleic ANHYDRIDE Grafted Polypropylene RGF-PP thermo-oxidative aging
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Preparation and Anti⁃arc Erosion Property of Ag Matrix Electrical Contact Material Reinforced by Novel Ti_(2)Cd
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作者 SUN Wanjie SHI Yuxin +4 位作者 DING Jianxiang REN Wanbin PAN Zhixiong ZHANG Peigen SUN Zhengming 《材料导报》 EI CAS CSCD 北大核心 2024年第21期190-196,共7页
Due to their outstanding electrical contact properties,Cd-containing silver-matrix electrical contact materials can meet the requirements of high stability and long life for military defense and aerospace applications... Due to their outstanding electrical contact properties,Cd-containing silver-matrix electrical contact materials can meet the requirements of high stability and long life for military defense and aerospace applications.In order to further reduce the Cd content under the premise of meeting the high-performance requirements,in this study,high-purity intermediate Ti_(2)Cd powder of MAX phase(Ti_(2)CdC)was synthesized with a pressureless technique and then applied to reinforce the Ag matrix.The Cd content of the as-prepared Ag/Ti_(2)Cd composites was actually reduced by 38.31%compared with conventional Ag/CdO material.Based on the systematic study of the effect of heat treatment temperature on the physical phase,morphology,interface and comprehensive physical properties of Ag/Ti_(2)Cd composites,the preferred samples(heat treated at 400°C for 1 h)showed high density(97.77%),low resistivity(2.34μΩ·cm),moderate hardness(90.8HV),high tensile strength(189.9 MPa),and exhibited good electrical contact performance after 40000 cycles of arc discharging under severe conditions(DC 28 V/20 A).The results of microscopic morphological evolution,phase change and elemental distribution of the electrical contact surface show that the combination of high stability of Ti_(2)Cd reinforcing phase,good interfacial bonding with Ag matrix and improved melt pool viscosity in the primary stage of arc erosion,results in low and stable contact resistance(average value 13.20 mΩ)and welding force(average value 0.6 N),low fluctuation of static force(2.2-2.5 N).The decomposition and absorption energy of Ti_(2)Cd and the arc extinguishing effect of Cd vapor are the main reasons for the stable arcing energy and arcing time of electric contacts in the late stage of arc erosion. 展开更多
关键词 low-voltage apparatus ag matrix composite Ti-Cd compound electrical contact properties arc erosion mechanism
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Strength and ductility optimization of HPDC AlSi8MgCuZn2 alloys by modifying pre-aging treatment
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作者 Yuan-hang Jiang Hui-ting Zheng +1 位作者 Fei Liu Hai-dong Zhao 《China Foundry》 SCIE EI CAS CSCD 2024年第4期343-351,共9页
Considering the components produced by high pressure die casting(HPDC)process usually with ultra-large sizes and complex morphologies,high temperature solid solution treatment is not a suitable method to further impro... Considering the components produced by high pressure die casting(HPDC)process usually with ultra-large sizes and complex morphologies,high temperature solid solution treatment is not a suitable method to further improve their mechanical properties.In this study,two-stage aging treatment with different pre-aging times was designed and employed to further improve the mechanical properties of HPDC Al8SiMgCuZn alloy.The characteristics of precipitates were evaluated by a transmission electron microscope(TEM),and the precipitation strengthening mechanism was discussed.The results reveal that the strengthening is mainly contributed by the precipitation ofβ″phase after two-stage aging,and the number density and size of the precipitates are significantly depended on the pre-aging time.The number density of precipitates is increased with the pre-aging time prolonged from 0 h to 4 h,and then decreases with the further increase of pre-aging time from 4 h to 6 h.The precipitates with the highest density and smallest size are observed after pre-aging for 4 h.After pre-aged at 100℃for 4 h and then artificial aged at 200℃for 30 min,the yield strength of 207 MPa,ultimate tensile strength of 325 MPa and elongation of 7.6%are achieved. 展开更多
关键词 high pressure die cast aluminum alloy microstructural heterogeneity mechanical properties precipitation strengthening two-stage aging
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Microstructure and Mechanical Properties of Al-11.3Zn-3.2Mg-1.3Cu-0.2Zr-0.1Sr-x Ti Extruded Aluminum Alloy with Different Aging Process 被引量:1
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作者 BAO Guoning XU Xiaojing +6 位作者 HUA Yinqun ZHANG Bin WEI Tao HONG Zhiheng LIU Lele HAN Mengnan SHA Shaohui 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第5期1161-1168,共8页
The influences of adding different amount of Ti(0%,0.39%,0.87%)and three kinds of difierent aging processes(T6,T6I6,RRA)on the microstructure and properties of Al-11.3Zn-3.2Mg-1.3Cu-0.2Zr-0.1Sr were investigated.Resul... The influences of adding different amount of Ti(0%,0.39%,0.87%)and three kinds of difierent aging processes(T6,T6I6,RRA)on the microstructure and properties of Al-11.3Zn-3.2Mg-1.3Cu-0.2Zr-0.1Sr were investigated.Results show that an appropriate amount of Ti can effectively inhibit grain growth and thus achieve the efiect of grain refinement.The contribution of dislocation density and dislocation strengthening become the biggest when Ti content is 0.39%.At the same time,the intergranular corrosion depth is the lowest when Ti content is 0.39%.Among the three aging processes,the alloys reach the greatest hardness and tensile strength in T6I6.The biggest tensile strength reaches 716.77 MPa.However,when aging at RRA,the alloys obtain the greatest elongation,reaching 7.2%,as well as the good corrosion resistance. 展开更多
关键词 AL-ZN-MG-CU Ti content aging process MICROSTRUCTURE properties
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Effect of Solutionizing and Aging on Microstructure and Mechanical Properties of Warm-rolled 7075 Alloy 被引量:1
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作者 YANG Xiaorong ZHAO Xiaodong +1 位作者 CHU Zhibing TUO Leifeng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第2期408-415,共8页
The effect of solution and aging treatments on microstructure and mechanical properties of warm-rolled 7075 alloy was investigated via optical microscope,electron backscattered diffraction,transmission electron micros... The effect of solution and aging treatments on microstructure and mechanical properties of warm-rolled 7075 alloy was investigated via optical microscope,electron backscattered diffraction,transmission electron microscopy and tensile tests.The 7075 alloy was subjected to solution treatments at 450℃for 1 h(ST1),490℃ for 1 h(ST2)and 1.5 h(ST3).Three aging routes were carried out on samples from ST2:one-step(A1),two-step(A2),and three-step aging(A3).The experimental results show mainly recrystallized equiaxed grains in ST1 and ST3 state but a combination of elongated and equiaxed grains in ST2 condition.Three aged alloys have similar microstructures of sample ST2 while the recrystallization frequency gets decreased after aging.The least recrystallization fraction occurs in A2 state.Three aged 7075 alloys all possess enhanced strength and plasticity.Precipitates characterization reveals the maximum strength is achieved in A2 sample as the matrix precipitates are composed mainly of smallηand manyη′phases.Aging route A2 appears preferable to other two aging conditions for attaining a pretty excellent combination of strength and plasticity. 展开更多
关键词 7075 alloy solutionizing aging PRECIPITATE MICROSTRUCTURE mechanical property
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Acceleration of aging behavior and improvement of mechanical properties of extruded AZ80 alloy through(10–12) twinning 被引量:1
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作者 Hyun Ji Kim Ye Jin Kim Sung Hyuk Park 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第2期671-683,共13页
The effects of pre-existing {10–12} extension twins on the precipitation behavior of an extruded AZ80 material during aging and on its mechanical properties after peak aging are investigated. The material containing ... The effects of pre-existing {10–12} extension twins on the precipitation behavior of an extruded AZ80 material during aging and on its mechanical properties after peak aging are investigated. The material containing {10–12} twins-which are formed by compression before aging(twinned material)-has a finer grain size and higher dislocation density than the extruded material. Although the peak hardnesses of the twinned and extruded materials are almost the same, the time to reach the peak hardness is considerably shorter in the former material than in the latter(4 h and 24 h, respectively). In the twinned material, the high dislocation density of the {10–12} twins promotes continuous precipitation, which results in the formation of numerous fine Mg17Al12precipitates within the twins in the early stage of aging.The formation of these continuous precipitates reduces the driving force for discontinuous precipitation, which consequently suppresses the formation and growth of coarse Mg17Al12precipitates at the grain boundaries. Despite its shorter peak-aging time, the 4 h-peak-aged twinned material shows higher tensile strength and elongation than the 24 h-peak-aged extruded material. These higher mechanical properties of the former material are attributed primarily to the presence of more abundant fine continuous precipitates, which are effective in strengthening the material, and less abundant coarse discontinuous precipitates, which can act as crack initiation sites. These results demonstrate that the introduction of {10–12} twins into wrought Mg–Al-based alloys can accelerate the Mg17Al12precipitation kinetics considerably and improve the strength and ductility of the peak-aged alloys simultaneously. 展开更多
关键词 AZ80 alloy TWIN aging PRECIPITATION Tensile properties
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Effect of secondary aging on microstructure and properties of cast Al-Cu-Mg alloy 被引量:1
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作者 Rui-ming Su Yong-xin Jia +3 位作者 Jian Xiao Guang-long Li Ying-dong Qu Rong-de Li 《China Foundry》 SCIE CAS CSCD 2023年第1期71-77,共7页
To obtain better comprehensive properties of cast Al-Cu-Mg alloys,the secondary aging(T6I6)process(including initial aging,interrupted aging and re-aging stages)was optimized by an orthogonal method.The microstructure... To obtain better comprehensive properties of cast Al-Cu-Mg alloys,the secondary aging(T6I6)process(including initial aging,interrupted aging and re-aging stages)was optimized by an orthogonal method.The microstructures of the optimized Al-Cu-Mg alloy were observed by means of scanning electron microscopy and transmission electron microscopy,and the properties were investigated by hardness measurements,tensile tests,exfoliation corrosion tests,and intergranular corrosion tests.Results show that the S phase andθ’phase simultaneously exist in the T6I6 treated alloy.Appropriately increasing the temperature of the interrupted aging in the T6I6 process can improve the mechanical properties and corrosion resistance of Al-Cu-Mg alloy.The optimal comprehensive properties(tensile strength of 443.6 MPa,hardness of 161.6 HV)of the alloy are obtained by initial aging at 180℃for 2 h,interrupted aging at 90℃for 30 min,and re-aging at 170℃for 4 h. 展开更多
关键词 cast Al-Cu-Mg alloy secondary aging mechanical properties corrosion resistance strengthening phase
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Influence of Non-Natural Ageing Temperature on the Microstructural Characteristics and Mechanical Properties of Cast Aluminum 6063 Alloy
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作者 Oluwole Oladele Ayodele Adedeke +1 位作者 Olajesu Olanrewaju Samuel Olusunle 《Journal of Minerals and Materials Characterization and Engineering》 2024年第2期91-99,共9页
This research considered the effect of non-natural aging on the microstructural characteristics and mechanical properties of as-cast aluminum 6063 alloys. The samples were developed through a sand casting process and ... This research considered the effect of non-natural aging on the microstructural characteristics and mechanical properties of as-cast aluminum 6063 alloys. The samples were developed through a sand casting process and machined into tensile and impact test samples before carrying out solution heat treatment at 550?C (0.83 T<sub>m</sub>) on two parts of the samples while retaining one part as the control. The two parts were further divided into sets denoted A and B and were aged at 180?C (0.27 T<sub>m</sub>) and 160?C (0.24 T<sub>m</sub>), respectively, for 12 hours. The results showed that sample A has the optimal yield strength and ultimate tensile strength of 192 and 206 MPa, respectively. Likewise, the sample gave the highest impact strength value of about 9.63 J/mm<sup>2</sup>. The observed results were supported by the optical micrograph, which revealed that the sample has evenly dispersed precipitates in its microstructure. This is deemed responsible for the observed increase in strength of the sample. 展开更多
关键词 Aluminum Alloy Non-Natural ageing Mechanical Properties Microstructural Features
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The aging behavior,microstructure and mechanical properties of AlN/AZ91 composite
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作者 Yunxia Sun Changlin Yang +4 位作者 Bin Zhang Jianfeng Fan Hongxiang Li Tianhao Zhao Jing Li 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第7期2458-2468,共11页
Microstructure evolution and mechanical properties of the aging treated AlN/AZ91 composites were systematically investigated by optical microscopy(OM),high resolution scanning electron microscopy(HRSEM)with an energy ... Microstructure evolution and mechanical properties of the aging treated AlN/AZ91 composites were systematically investigated by optical microscopy(OM),high resolution scanning electron microscopy(HRSEM)with an energy dispersive spectrum(EDS),and high-angle annular dark field scanning transmission electron microscopy(HAADF-STEM).The results show that the higher fracture elongation(14±1%)and ultimate tensile strength(275±6 MPa)were simultaneously obtained in the peak-aged AlN/AZ91 composites.Comparied with AZ91 matrix alloy,the strength was increased by about 44%and the elongation was approximately five times higher,which mainly attributed to the precipitation of nano-sizedγ-Mg_(17)Al_(12)phase and the activation of non-basal slip systems induced by in-situ AlN particles at room temperature.However,the in-situ formation of AlN reinforcements consumed part of Al element in the matrix alloy,which resulted into the volume fraction decreasing ofγ-Mg_(17)Al_(12)precipitates,and then the age hardening and strengthening efficiency were reduced in the AlN/AZ91 composites.On the other hand,the mismatch of thermal expansion coefficient between AlN particles and AZ91 matrix generated high density dislocations around AlN particles,which promoted the precipitation ofγ-Mg_(17)Al_(12)phase,and then the peak aging time and temperature were decreased. 展开更多
关键词 Magnesium matrix composites In-situ AlN particles aging behavior Microstructure Mechanical properties
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The Accelerated Thermo-Oxidative Aging Characteristics of Wood Fiber/Polycaprolactone Composite:Effect of Temperature,Humidity and Time 被引量:1
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作者 Shuang Si Qian Tang Xingong Li 《Journal of Renewable Materials》 SCIE EI 2021年第12期2209-2222,共14页
This study investigated the characteristics of wood fiber/polycaprolactone composite after an artificial accelerated thermo-oxidative aging treatment.The effect of time,temperature and humidity during the treatment on... This study investigated the characteristics of wood fiber/polycaprolactone composite after an artificial accelerated thermo-oxidative aging treatment.The effect of time,temperature and humidity during the treatment on their mechanical,chemical and morphology properties were evaluated.The composite was prepared from melted wood fibers and modified polycaprolactone by a molding process.A temperature and humidity controllable test chamber was used for the thermo-oxidative aging of the composite.The thermo-oxidative aging caused surface of the composite to be much more rougher and even a few cracks and holes appeared on it.According to the spectra of Fourier Transform Infrared(FTIR)and Gel Permeation Chromatography(GPC),C=O in the molecular chain of polycaprolactone was hydrolyzed and C–O was broken after the aging treatment,which resulted in a reduction in average molecular weight of the composite.Moreover,results showed that the mechanical strength decreased a lot with the increase in time,temperature and humidity,and the effect of temperature and humidity was more significant compared with that of time.Controlling the temperature and humidity during thermo-oxidative aging treatment could accelerate the aging of composite,which provided a quick and effective method for evaluating the aging resistance of the composite. 展开更多
关键词 Wood fiber POLYCAPROLACTONE wood plastic composite thermo-oxidative aging
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Influence of aging on microstructure and mechanical properties of AZ80 and ZK60 magnesium alloys 被引量:13
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作者 李艳 张治民 薛勇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第4期739-744,共6页
The effect of aging on the microstructure and mechanical properties of AZ80 and ZK60 wrought magnesium alloys was studied with optical microscope and mechanical testers. The results demonstrate that both the tensile s... The effect of aging on the microstructure and mechanical properties of AZ80 and ZK60 wrought magnesium alloys was studied with optical microscope and mechanical testers. The results demonstrate that both the tensile strength and elongation of AZ80 alloy increase firstly and then decrease as the aging temperature rises, the peak values appear when the aging temperature is 170 ℃ The hardness of ZK60 alloy increases firstly and then decreases as the aging temperature rises, and the hardness reaches its peak value at 170 ℃. However, the toughness of the alloy is just the opposite. Moreover, ZK60 alloy has good performances in both impact toughness and other mechanical properties at the aging temperature from 140 ℃ to 200 ℃. 展开更多
关键词 AZ80 magnesium alloy ZK60 magnesium alloy aging MICROSTRUCTURE mechanical properties
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Aging behavior and mechanical properties of 6013 aluminum alloy processed by severe plastic deformation 被引量:8
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作者 刘满平 蒋婷慧 +5 位作者 王俊 刘强 吴振杰 Ying-da YU Pl C.SKARET Hans J.ROVEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第12期3858-3865,共8页
Structural features, aging behavior, precipitation kinetics and mechanical properties of a 6013 Al–Mg–Si aluminum alloy subjected to equal channel angular pressing (ECAP) at different temperatures were comparative... Structural features, aging behavior, precipitation kinetics and mechanical properties of a 6013 Al–Mg–Si aluminum alloy subjected to equal channel angular pressing (ECAP) at different temperatures were comparatively investigated with that in conventional static aging by quantitative X-ray diffraction (XRD) measurements, differential scanning calorimetry (DSC) and tensile tests. Average grain sizes measured by XRD are in the range of 66-112 nm while the average dislocation density is in the range of 1.20×10^14-1.70×10^14 m^-2 in the deformed alloy. The DSC analysis reveals that the precipitation kinetics in the deformed alloy is much faster as compared with the peak-aged sample due to the smaller grains and higher dislocation density developed after ECAP. Both the yield strength (YS) and ultimate tensile strength (UTS) are dramatically increased in all the ECAP samples as compared with the undeformed counterparts. The maximum strength appears in the samples ECAP treated at room temperature and the maximum YS is about 1.6 times that of the statically peak-aged sample. The very high strength in the ECAP alloy is suggested to be related to the grain size strengthening and dislocation strengthening, as well as the precipitation strengthening contributing from the dynamic precipitation during ECAP. 展开更多
关键词 Al-Mg-Si aluminum alloy severe plastic deformation equal-channel angular pressing aging behavior precipitation kinetics mechanical properties strengthening mechanisms
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Influence of Li addition on mechanical property and aging precipitation behavior of A1-3.5Cu-1.5Mg alloy 被引量:1
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作者 邓运来 杨金龙 +2 位作者 李思宇 张劲 张新明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第6期1653-1658,共6页
The influence of Li addition on mechanical property and aging precipitation behavior of Al-3.5Cu-1.5Mg alloy was investigated by tensile test,scanning electron microscopy(SEM),transmission electron microscopy(TEM)... The influence of Li addition on mechanical property and aging precipitation behavior of Al-3.5Cu-1.5Mg alloy was investigated by tensile test,scanning electron microscopy(SEM),transmission electron microscopy(TEM) and high resolution transmission electron microscopy(HRTEM).The results show that the tensile strength can be significantly improved with the slightly decreased ductility and the form of fracture morphology is converted from ductile fracture into ductile/britde mixed fracture by adding 1.0%Li.Besides,the peak aging time at 185 ℃ is delayed from 12 to 24 h and the main precipitation phase S(Al2CuMg) is converted into S'(Al2CuMg)+δ(Al3Li),while the formation of S'(Al2CuMg) is delayed. 展开更多
关键词 aluminum alloy Al-3.5Cu-1.5Mg alloy LI aging behavior mechanical properties
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Ag元素和时效时间对T6态Al-5Cu-0.8Mg-0.15Zr-0.2Sc合金拉伸性能的影响
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作者 王莹 陈立佳 +2 位作者 车欣 张浩宇 张思倩 《沈阳理工大学学报》 CAS 2024年第4期51-56,共6页
为了明确Ag元素的添加对Al-Cu-Mg系铝合金拉伸性能的影响,针对T6态(固溶+时效处理)的热挤压Al-5Cu-0.8Mg-0.15Zr-0.2Sc(-0.5Ag)合金进行了室温和高温拉伸实验。结果表明,添加0.5%Ag元素可显著提高T6态Al-5Cu-0.8Mg-0.15Zr-0.2Sc合金的... 为了明确Ag元素的添加对Al-Cu-Mg系铝合金拉伸性能的影响,针对T6态(固溶+时效处理)的热挤压Al-5Cu-0.8Mg-0.15Zr-0.2Sc(-0.5Ag)合金进行了室温和高温拉伸实验。结果表明,添加0.5%Ag元素可显著提高T6态Al-5Cu-0.8Mg-0.15Zr-0.2Sc合金的室温抗拉强度、屈服强度、峰时效态及该合金在150~300℃范围的抗拉强度和屈服强度,但会降低该合金的室温和高温塑性。断口形貌的扫描电子显微镜观察与分析结果表明,在室温及高温拉伸加载条件下,T6态Al-5Cu-0.8Mg-0.15Zr-0.2Sc(-0.5Ag)合金的拉伸断口上大部分存在韧窝和撕裂棱,表现出明显的韧性断裂特点。 展开更多
关键词 Al-Cu-Mg系合金 拉伸性能 T6处理 韧性断裂
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基于密度泛函理论研究Ag-Co团簇的结构、电子和光学性能
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作者 李维银 尚瑞咏 +1 位作者 王春勇 张永莉 《原子与分子物理学报》 CAS 北大核心 2025年第2期63-69,共7页
基于密度泛函理论研究了7个原子Ag-Co团簇结构的稳定性、电子和光学性能.研究结果表明,7个原子Ag-Co团簇的最稳定结构都是十面体结构,Co原子数量较少时,Co原子主要占据十面体的轴向位,Ag原子主要占据赤道位,随着Co原子数的增加,Co原子... 基于密度泛函理论研究了7个原子Ag-Co团簇结构的稳定性、电子和光学性能.研究结果表明,7个原子Ag-Co团簇的最稳定结构都是十面体结构,Co原子数量较少时,Co原子主要占据十面体的轴向位,Ag原子主要占据赤道位,随着Co原子数的增加,Co原子逐渐替换了赤道位上的Ag原子.当Co原子数增加时,Ag-Co团簇的垂直电离势、垂直电子亲能和最高占据轨道与最低未占据轨道之间的能隙整体上都呈现出下降趋势,表明电子稳定性降低;Ag-Co团簇的吸收光谱整体出现了红移,吸收峰的强度逐渐减弱,吸收谱的宽度变窄. 展开更多
关键词 银钴团簇 几何结构 电子性能 光学性能
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Ag含量对低合金化Cu-Ag合金拉拔线材组织和性能的影响
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作者 杨文朋 位高锋 +2 位作者 封存利 介明山 武国旗 《中国有色金属学报》 EI CAS CSCD 北大核心 2024年第8期2697-2707,共11页
采用热型水平连铸技术制备Ag含量分别为0.6%、1.0%、2.0%和4.0%的Cu-Ag合金杆坯,并将d 16.0 mm杆坯拉拔加工成d 1.0 mm的线材,利用透射电镜分析其微细组织,并测试导电和力学性能。结果表明:拉拔线材由平行于拉拔方向的纤维晶组成,Cu-0.... 采用热型水平连铸技术制备Ag含量分别为0.6%、1.0%、2.0%和4.0%的Cu-Ag合金杆坯,并将d 16.0 mm杆坯拉拔加工成d 1.0 mm的线材,利用透射电镜分析其微细组织,并测试导电和力学性能。结果表明:拉拔线材由平行于拉拔方向的纤维晶组成,Cu-0.6Ag合金线纤维晶平均宽度约为340 nm;随着Ag含量增加,纤维晶尺寸减小,Cu-4.0Ag合金线纤维晶平均宽度为115 nm。纤维晶存在显著的〈111〉取向,纤维晶晶界主要为由位错塞积形成的小角度晶界,晶内存在大量位错,并发现少量的孪晶。随着Ag含量增加,Ag元素分布由局部富集转变为Ag相析出。Cu-0.6Ag和Cu-4.0Ag合金线材导电率随Ag含量的增大而减小,分别为91.2%IACS和79.5%IACS。Cu-0.6Ag和Cu-4.0Ag合金线材抗拉强度随Ag含量的增加而增大,分别为402.6 MPa和702.9 MPa。抗拉强度提高的主要原因是细晶强化和Ag相沉淀强化作用。 展开更多
关键词 CU-ag合金 热型连铸 拉拔 导电率 力学性能
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Ag(Ⅰ)与氯苯基苯并咪唑配合物的合成、圆二色性和荧光性质
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作者 王卓渊 林香凤 《化工技术与开发》 CAS 2024年第1期8-11,39,共5页
本文合成了Ag(Ⅰ)与2-(o-氯苯基)苯并咪唑(OCBM)的配合物,采用元素分析、质谱、UV、IR、摩尔电导率等手段进行了表征。圆二色性研究发现,配合物在199nm处呈正科顿效应,而在208nm和247nm处呈负科顿效应。荧光性质研究表明,配合物的特征... 本文合成了Ag(Ⅰ)与2-(o-氯苯基)苯并咪唑(OCBM)的配合物,采用元素分析、质谱、UV、IR、摩尔电导率等手段进行了表征。圆二色性研究发现,配合物在199nm处呈正科顿效应,而在208nm和247nm处呈负科顿效应。荧光性质研究表明,配合物的特征荧光发射峰出现在601nm和613nm处,荧光寿命τ601和τ613分别为0.40ns和0.35ns。Ag(Ⅰ)配合物可发射橙色荧光和红色荧光,是良好的荧光材料。 展开更多
关键词 2-(o-氯苯基)苯并咪唑 ag(Ⅰ)配合物 合成 圆二色性 荧光性质
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