|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Effects of Pulsed Magnetic Field on Microsegregation of Solute Elements in a Ni-Based Single Crystal Superalloy显示文摘The effects of a pulsed magnetic field(PMF) on the microsegregation of solute elements during directional solidification of a Ni-based single crystal superalloy were experimentally investigated,and the results show that the PMF significantly affects the microsegregation of Al,Ti,Co,Mo and W elements in the alloy.However,the distribution behavior differs for both positive and negative segregation elements.With the PMF,the microsegregation of negative segregation elements,Co and W,was restrained effectively,while that of positive segregation elements,Al,Tiand Mo,was aggravated.A segregation model was established to reveal the distribution mechanism of the elements with PMF.It is considered that,under the action of PMF,the jumping of solute atoms from the liquid phase to solid phase is hindered,but the jumping of solute atoms from the solid phase into liquid phase is promoted during solidification.As a result,the effective distribution coefficient of the solute atoms is reduced,which leads to the reduction of microsegregation of negative segregation elements and aggravation of microsegregation of positive segregation elements. | Yingju Li Yuefei Teng Xiaohui Feng Yuansheng Yang | 2017 | Journal of Materials Science & Technology2017，33，1： | 12 |
| 2 | Influence of the low voltage pulsed magnetic field on the columnar-to-equiaxed transition during directional solidification of superalloy K4169显示文摘The low voltage pulsed magnetic field(LVPMF)disrupts the columnar dendrite growth,and the columnarto-equiaxed transition(CET)occurs during the directional solidification of superalloy K4169.Within the pulse voltage ranging from 100Vto 200 V,a transition from columnar to equiaxed grain was observed,and the grain size decreased as the pulse voltage rised.As the pulse frequency increased,the CET occurred,and the grains were refined.However,the grains became coarse,and the solidification structure was columnar crystal again when frequency increased to 10 Hz.The LVPMF had an optimal frequency to promote CET.The LVPMF on the CET was affected by the withdrawal speed and increasing the withdrawal speed enhances the CET.The distribution of electromagnetic force and flow field in the melt under the LVPMF were modeled and simulated to reveal the CET mechanism.It is considered that the CET should be attributed to the coupling effects of magnetic vibration and melt convection induced by the LVPMF. | Kuiliang Zhang Yingju Li Yuansheng Yang | 2020 | Journal of Materials Science & Technology2020，47，13： | 7 |
| 3 | Effect of Pulsed Magnetic Field on the Residual Stress of Rolled Magnium Alloy AZ31 Sheet显示文摘A novel method of pulsed magnetic field(PMF)treatment was developed to eliminate the residual stress of rolled magnesium alloy AZ31 sheet in this study.The eff ect of PMF on residual stress of rolled AZ31 sheet was investigated and its mechanism was analyzed.The experimental results revealed that the pulse frequency had a significant impact on residual stress.After 10.0 Hz PMF treatment,the average and maximum reduction rates of residual stress along the rolled direction were 26.6%and 30.3%,respectively.It was found that the dislocation density and parallel dislocation in grains of the rolled sheet increased after it was treated by the pulsed magnetic field.The simulation results showed that the Lorentz force generated by the pulsed magnetic field can lead to basal slip,thereby resulting in local plastic deformation.Besides,the Joule heat produced during the PMF treatment was conducive to the elimination of residual stress. | Meng Yan Cong Wang Tianjiao Luo Yingju Li Xiaohui Feng Qiuyan Huang Yuansheng Yang | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，1： | 3 |
| 4 | Simulation of the Influence of Pulsed Magnetic Field on the Superalloy Melt with the Solid-Liquid Interface in Directional Solidification显示文摘The effect of the pulsed magnetic field on the grain refinement of superalloy K4169 has been studied in directional solidification.In the presence of the solid-liquid interface condition,the distributions of the electromagnetic force,flow field,temperature field,and Joule heat in front of the solid-liquid interface in directional solidification with the pulsed magnetic field are simulated.The calculation results show that the largest electromagnetic force in the melt appears near the solid-liquid interface,and the electromagnetic force is distributed in a gradient.There are intensive electromagnetic vibrations in front of the solid-liquid interface.The forced melt convection is mainly concentrated in front of the solid-liquid interface,accompanied by a larger flow velocity.The simulation results indicate that the grain refinement is attributed to that the electromagnetic vibration and forced convection increase the nucleation rate and the probability of dendrite fragments survival,for making dendrite easily fragmented,homogenizing the melt temperature,and increasing the undercooling in front of the solid-liquid interface. | Kuiliang Zhang Yingju Li Yuansheng Yang | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，10： | 2 |
| 5 | Electrochemical immunoassay of benzopyrene based on dual amplification strategy of electron-accelerated Fe 3 O 4 /polyaniline platform and multi-enzyme-functionalized carbon sphere label显示文摘 | Mouhong Lin Yingju Liu Zihong Sun Shenglai Zhang Zhuohong Yang Chunlin Ni | 2012 | Analytica Chimica Acta2012，，： | 1 |
| 6 | Effect of the microstructure parameters on the corrosion characteristics of Mg-Zn-Ca alloy with columnar structure显示文摘Magnesium alloys with homogeneous degradation and controlled degradation rate are desirable for biodegradable materials.In the present work,Mg-3 wt.%Zn-0.2 wt.%Ca alloys with different columnar structures were fabricated and the degradation in 0.9 wt.%NaCl were investigated.With the increase of the growth rate for the directional solidification,the microstructure of the directionally solidified(DSed)alloy evolved from cellular to dendritic coupled with the change of the spacing of the primary trunks(λ_(1))and the volume fraction(fv)of Ca_(2)Mg_(6)Zn_(3) phase.The results of the corrosion test suggested that the alloy with cellular structure experienced homogeneous corrosion and exhibited the lowest corrosion rate.The good corrosion resistance of the alloy with cellular structure was attributed to the protective corrosion products film(CPF),which was closely related to the fv of Ca_(2)Mg_(6)Zn_(3) phase andλ_(1).To evaluate the corrosion rates(CR)of the DSed Mg-Zn-Ca alloys with different microstructures,a parameterαwas proposed in this work,which was calculated byλ_(1) and the fv of Ca_(2)Mg_(6)Zn_(3) phase.The fitting result showed that there was a linear relationship between CR andα,which was CR=4.1899+0.00432α.This means that the CR of the DSed Mg-Zn-Ca alloy can be evaluated if the microstructure had been characterized. | Yi Zhang Xiaohui Feng Qiuyan Huang Yingju Li Yuansheng Yang | 2023 | Journal of Magnesium and Alloys2023，11，5： | 1 |
| 7 | Northeast power system simulator(NEPSS)显示文摘1.IntroductionThe Northeast Power System is one of the four bulk powersystems in China,which covers the provinces of Liaoning,Jilin,Heilongjiang and a small part of Inner Mongolia.The total installedcapacity in 1990 was 21,300 MW and the peak demand was 13,600MW.The Control Center is in Shenyang.The dispatching automationsystem which is mainly composed of a dual computer system(2XVAX785)was installed and put into operation in 1988.The plan | Gu Yongchang Wang Xinfeng Li Wenping Sun Guosheng Electrical Engineering Department of Tsinghua UniversityYang Songqi Xu Muliang Yang Kexuan Huang Yingju Electric Power Dispatching and Communication Bureau of Northeast Power Administration.P.R.China | 1992 | Electricity1992，，4： | 1 |
| 8 | Controlling dynamic recrystallization via modified LPSO phase morphology and distribution in Mg-Gd-Y-Zn-Zr alloy显示文摘Featured initial microstructures of Mg-11Gd-4Y-2Zn-0.5Zr alloy(wt%) were obtained by adjusting temperatures of solid solution and cooling methods, including island intergranular 18R and 14H LPSO phases with low-density stacking faults, differentially spaced lamellar intragranular 14H-LPSO phases, and network intergranular 18R-LPSO phases with high-density intragranular stacking faults. Effects of these featured LPSO phases and stacking faults on dynamic recrystallization(DRX) behavior were investigated via hot compression. Promoted DRX behavior via particle stimulated nucleation(PSN) is introduced by coexisting intergranular island 18R and 14H LPSO phases and intragranular wide spacing lamellar 14H-LPSO phases, contributing the highest DRX fraction of 42.6%. Conversely, it is found that DRX behavior with network intergranular 18R-LPSO phases and dense intragranular stacking fault is considerably inhibited with the lowest fraction of 22.8%. That is, the restricted DRX due to dislocations pinning by stacking faults overwhelms the enhanced DRX behavior via PSN of island intergranular 18R and 14H LPSO phases. Specially, compared with dense intragranular lamellar 14H-LPSO phases, high-density stacking faults exert a larger inhibition effect on DRX behavior. | Ce Zheng Shuaifeng Chen Ming Cheng Shihong Zhang Yingju Li Yuansheng Yang | 2023 | Journal of Magnesium and Alloys2023，11，11： | 1 |
| 9 | Heat-treated glassy carbon under pressure exhibiting superior hardness,strength and elasticity显示文摘Glassy carbon(GC)is a type of non-graphitizing disordered carbon material at ambient pressure and high temperatures,which has been widely used due to its excellent mechanical properties.Here we report the changes in the microstructure and mechanical properties of GC treated at high pressures(up to 5 GPa)and high temperatures.The formation of intermediate sp2-sp3 phases is identified at moderate treatment temperatures before the complete graphitization of GC,by analyzing synchrotron X-ray diffraction,Raman spectra,and transmission electron microscopy images.The intermediate metastable carbon materials exhibit superior mechanical properties with hardness reaching up to 10 GPa and compressive strength reaching as high as 2.5 GPa,nearly doubling those of raw GC,and improving elasticity and thermal stability.The synthesis pressure used in this study can be achieved in the industry on a commercial scale,enabling the scalable synthesis of this type of strong,hard,and elastic carbon materials. | Meng Hu Shuangshuang Zhang Bing Liu Yingju Wu Kun Luo Zihe Li Mengdong Ma Dongli Yu Lingyu Liu Yufei Gao Zhisheng Zhao Yoshio Kono Ligang Bai Guoyin Shen Wentao Hu Yang Zhang Ralf Riedel Bo Xu Julong He Yongjun Tian | 2021 | Journal of Materiomics2021，7，1： | 1 |
| 10 | Extraordinary high-temperature mechanical properties in binder-free nanopolycrystalline WC ceramic显示文摘From the perspective of high-temperature applications,materials with excellent high-temperature mechanical properties are always desirable.The present work demonstrates that the binder-free nanopolycrystalline WC ceramic with an average grain size of 103 nm obtained by high-pressure and hightemperature sintering exhibits excellent mechanical properties at both room temperature and high temperature up to 1000℃.Specifically,the binder-free nanopolycrystalline WC ceramic still maintains a considerably high Vicker hardness H_(V)of 23.4 GPa at 1000℃,which is only 22%lower than the room temperature H_(V).This outstanding thermo-mechanical stability is superior to that of typical technical ceramics,e.g.SiC,Si_(3)N_(4),Al_(2)O_(3),etc.Nanocrystalline grains with many dislocations,numerous low-energy,highly stableΣ2 grain boundaries,and a relatively low thermal expansion coefficient,are responsible for the observed outstanding high-temperature mechanical properties. | Hongfeng Dong Baozhong Li BoBo Liu Yang Zhang Lei Sun Kun Luo Yingju Wu Mengdong Ma Bing Liu Wentao Hu Julong He Dongli Yu Bo Xu Zhisheng Zhao Yongjun Tian | 2022 | Journal of Materials Science & Technology2022，，2： | 1 |
| 11 | Effects of traceelement and purification on properties of AZ80 magnesiumalloy 显示文摘 | Li Yingju Luo Tianjiao Yang Yuansheug | 2010 | Transactions of Nonferrous Metals Society of China2010，20，2： | 1 |
| 12 | Grain refinement of as-cast superalloy IN718 under action of low voltage pulsed magnetic field显示文摘 | LI Yingju MA Xiaoping YANG Yuansheng | 2011 | Transaction of Nonferrous Metals Society of China2011，，21： | 1 |
| 13 | Hard nanocrystalline gold materials prepared via high-pressure phase transformation显示文摘As one of the important materials,nanocrystalline Au(n-Au)has gained numerous interests in recent decades owing to its unique properties and promising applications.However,most of the current n-Au thin films are supported on substrates,limiting the study on their mechanical properties and applications.Therefore,it is urgently desired to develop a new strategy to prepare nAu materials with superior mechanical strength and hardness.Here,a hard n-Au material with an average grain size of~40 nm is prepared by cold-forging of the unique Au nanoribbons(NRBs)with unconventional 4H phase under high pressure.Systematic characterizations reveal the phase transformation from 4H to face-centered cubic(fcc)phase during the cold compression.Impressively,the compressive yield strength and Vickers hardness(HV)of the prepared n-Au material reach~140.2 MPa and~1.0 GPa,which are 4.2 and 2.2 times of the microcrystalline Au foil,respectively.This work demonstrates that the combination of high-pressure cold-forging and the in-situ 4H-to-fcc phase transformation can effectively inhibit the grain growth in the obtained n-Au materials,leading to the formation of novel hard n-Au materials.Our strategy opens up a new avenue for the preparation of nanocrystalline metals with superior mechanical property. | Chenlong Xie Wenxin Niu Penghui Li Yiyao Ge Jiawei Liu Zhanxi Fan Xiaoxiao Liu Ye Chen Ming Zhou Zihe Li Mengdong Ma Yonghai Yue Jing Wang Li Zhu Kun Luo Yang Zhang Yingju Wu Lin Wang Bo Xu Hua Zhang Zhisheng Zhao Yongjun Tian | 2022 | Nano Research2022，15，7： | 0 |
| 14 | HCl-Induced Hg^(0)Transformation over CuMn_(2)O_(4)Sorbent显示文摘CuMn_(2)O_(4)spinel has been regarded as a highly efficient sorbent for Hg^(0)capture from flue gas.The regenerability and recyclability of CuMn_(2)O_(4)sorbent are mainly associated with the mercury speciation adsorbed on its surface.However,the effect mechanism of HCl on Hg^(0)transformation over CuMn_(2)O_(4)sorbent is still elusive.Experiments were conducted to understand the effect of HCl on Hg^(0)transformation over CuMn_(2)O_(4)sorbent.The results indicate thatCuMn_(2)O_(4)sorbent is a mesoporousmaterial and possesses a good thermal stability.CuMn_(2)O_(4)shows>95%Hg^(0)removal efficiency in a wide temperature window of 50-350℃.The favorable electron-transfer environment caused by the mixed valence states of Cu and Mn cations is responsible for the excellent Hg^(0)removal performance of CuMn_(2)O_(4)sorbent.CuMn_(2)O_(4)shows a higherHg^(0)adsorption capacity of 4774.57μg/g.Hg^(0)adsorption process over CuMn_(2)O_(4)sorbent can bewell described by the developed kinetic model.Hg^(0)removal efficiency of CuMn_(2)O_(4)sorbent does not depend on the presence of HCl.Mercury species adsorbed on the CuMn_(2)O_(4)sorbent in the presence of HCl mainly exist in the forms of Hg^(O)and HgCl_(2)O_(8)·H_(2)O.HCl shows a significant effect on mercury speciation over CuMn_(2)O_(4)sorbent.Most of Hg^(O)species will be transformed into HgCl_(2)O_(8)·H_(2)O in the presence of HCl. | Aijia Zhang Yingju Yang Jing Liu Junyan Ding | 2022 | Energy Engineering2022，119，2： | 0 |
| 15 | Influence of Electric Current on Kirkendall Diffusion of Zn/Cu Couples显示文摘在 Zn/Cu 夫妇的 Kirkendall 散开上的电流的影响被调查。在不同电流的行动下面, Zn/Cu 散开夫妇在不同成立时间在 785 ° C 被退火。试验性的结果证明 Kirkendall 飞机的排水量与增加成立时间增加。然而,没有电流,有电流的 Kirkendall 飞机的排水量比那大。在 Kirkendall 飞机和成立时间的排水量之间的关系在电流的行动下面被改变。为提高效果的电流的可能的原因是从电子的精力转移到跳的原子,增加综合散开系数,它在 Kirkendall 飞机的速度导致增加。 | Yingju LI Yuansheng YANG Xiaohui FENG | 2008 | Journal of Materials Science & Technology2008，24，3： | 0 |
| 16 | The corrosion characteristics and mechanism of directionally solidified Mg-3Zn-xCa alloys显示文摘An investigation into the corrosion characteristics and mechanism of directionally solidified(DSed) Mg-3Zn-xCa(x = 0, 0.2, 0.5,0.8 wt.%) alloys in 0.9 wt.% Na Cl solution is presented. The DSed microstructure consists of columnar dendrites and eutectics distributed in the interdendritic region. The primary dendritic arm spacing(PDAS) and the volume fraction(fv) of the secondary phases are under the significant impact of the content of Ca. The corrosion rates evaluated using electrochemical measurements and immersion tests are accelerated monotonously with the increase of Ca content in DSed alloys. The corrosion resistance of the DSed alloys is significantly affected by the corrosion products film(CPF) and the secondary phases. The corrosion products of DSed Mg-3Zn alloy contain Mg(OH)_(2) and ZnO. The existence of ZnO greatly enhances the corrosion resistance of DSed Mg-3Zn alloy. As for the DSed alloys containing Ca content, a relatively protective CPF without deep pits can form on the surface of DSed Mg-3Zn-0.2Ca specimen during the corrosion. The f_(v)of the secondary phases dominates the corrosion rate of the DSed Mg-Zn-Ca alloys. The corrosion of DSed Mg-3Zn-xCa alloys initiates as a result of microgalvanic coupling between the cathodes of secondary phases and α-Mg matrix anode. Then, the corrosion gradually extends longitudinally with the breakdown of CPF. | Yi Zhang Xiaohui Feng Qiuyan Huang Yingju Li Xuehui Hao Changzheng Wang Yuansheng Yang | 2023 | Journal of Magnesium and Alloys2023，11，10： | 0 |
| 17 | Fluidity, Microstructure, and Tensile Properties of Sub-rapidly Solidified Mg-6Al-4Zn-xSn(x=0,0.6,1.2,1.8) Alloy显示文摘In this paper, the infl uence of the Sn element on the melt viscosity, grain size, shrinkage, and tensile properties of the subrapidly solidified Mg-6Al-4Zn alloy was studied. The results showed that the melt viscosity of the Mg-6Al-4Zn alloy was greatly decreased because of the addition of Sn. As the content of Sn increased from 0 to 1.8 wt.%, the grain size of the alloy was refined, and the dendrite microstructure was changed to rose-shaped ones simultaneously. The decreased melt viscosity and refined microstructure were conductive to the feeding of melt, which contributed to the reduction in volume fraction of shrinkage. The volume fraction of shrinkage of the Mg-6Al-4Zn-1.2 Sn alloy was reduced by 30.8%, compared with that of the alloy without Sn addition. Tensile properties of the Mg-6Al-4Zn-x Sn alloys were increased firstly and then decreased with the augmented Sn content. The yield strength, ultimate tensile strength, and elongation of the alloy containing 1.2 wt.% Sn were 21.4%, 39.5%, and 259.0% higher than those of the alloy without Sn addition, respectively. The addition of Sn was considered to reduce the shrinkage of the sub-rapidly solidified Mg-6Al-4Zn magnesium alloy and thus improved its tensile properties. To identify the mechanism, the effect of Sn on the volume fraction of shrinkage was discussed from three aspects of melt viscosity, grain refinement, and volume fraction of eutectic phases. | Jie Cui Tianjiao Luo Yingju Li Xiaohui Feng Qiuyan Huang Yuansheng Yang | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，9： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员