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| 1 | Catalytic fast pyrolysis of Kraft lignin with HZSM-5 zeolite for producing aromatic hydrocarbons显示文摘 | Xiangyu LI Lu SU Yujue WANG Yanqing YU Chengwen WANG Xiaoliang LI Zhihua WANG | 2012 | Frontiers of Environmental Science & Engineering2012，6，3： | 14 |
| 2 | Strengthening FCC-CoCrFeMnNi high entropy alloys by Mo addition显示文摘In order to strengthen the face-centered-cubic(FCC) type CoCrFeMnNi high entropy alloys(HEAs), different contents of Mo(0–16 at.%, similarly hereinafter) were alloyed. Phase evolution, microstructure,mechanical properties and related mechanism of these HEAs were systematically studied. The results show that sigma phase is appeared with addition of Mo, and the volume fraction of it increases gradually from 0 to 66% with increasing Mo content. It is found that Mo is enriched in sigma phase, which indicates that Mo element is beneficial to form sigma phase. Compressive testing shows that the yield strength of the alloys increases gradually from 216 to 765 MPa, while the fracture strain decreases from 50%(no fracture) to 19% with increasing of Mo. The alloy exhibits the best compressive performance when Mo content reaches 11%, the yield strength, fracture strength and fracture strain are 547 MPa, 2672 MPa and44% respectively. The increased volume fraction of sigma phase plays an important role in improving the compressive strength of(CoCrFeMnNi)_(100-x)Mo_xHEAs. | Gang Qin Ruirun Chen Huiting Zheng Hongze Fang Liang Wang Yanqing Su Jingjie Guo Hengzhi Fu | 2019 | Journal of Materials Science & Technology2019，35，4： | 11 |
| 3 | Effect of Traveling Magnetic Field on Mould-Filling Length of the A357 Melt during Casting Thin Walled Plate显示文摘In order to improve the mould filling ability, the method for production of thin-walled castings in the travelingmagnetic field was applied. The relationship between magnetic field density and input voltage as well as distancewas investigated, and the mould filling length of A357 melt has been studied. The electromagnetic forcesappliedon the melt were also analyzed. The result shows that the mould-filling length of the melt increase rapidly with theincrease of magnetic flux density. The mould filling lengths in gypsum upper mould and magnetic material uppermould were compared from the standpoint of application. It demonstrated that the steel upper mould is superior togypsum mould. | Tiejun ZHANG, Jingjie GUO, Yanqing SU, Hongsheng DING, Weisheng BI, Jim JIA and Hengzhi FUSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | 2003 | Journal of Materials Science & Technology2003，19，1： | 8 |
| 4 | Microstructures and mechanical properties of Nb-alloyed CoCrCuFeNi high-entropy alloys显示文摘Nb has a positive effect on improving the mechanical properties of metal materials, and it is expected to strengthen CoCrCuFeNi high-entropy alloys(HEAs) with outstanding ductility and relatively weak strength. In this paper, the alloying effects of Nb on the microstructural evolution and the mechanical properties of the(CoCrCuFeNi)_(100-x)Nb_xHEA were investigated systematically. The result shows that Nb promotes the phase transition from FCC(face-centered cubic) to Laves phase, and the volume fractions of Laves phase increase from 0% to 58.2% as the Nb content increases. Compressive testing shows that the addition of Nb has a positive effect on improving the strength of CoCrCuFeNi HEA. The compressive yield strength of(CoCrCuFeNi)_(100-x)Nb_xHEAs increases from 338 MPa to 1322 MPa and the fracture strain gradually reduces from 60.0%(no fracture) to 8.1% as the Nb content increases from 0 to 16 at.%. The volume fraction increase of hard Laves phase is the key factor for the strength increase, and the reduction of the VEC(valence electron concentration) value induced by the addition of Nb is beneficial for the increase of the Laves phase content in these alloys. | Gang Qin Shu Wang Ruirun Chen Xue Gong Liang Wang Yanqing Su Jingjie Guo Hengzhi Fu | 2018 | Journal of Materials Science & Technology2018，34，2： | 8 |
| 5 | Lamellar orientation control in directionally solidified TiAl intermetallics显示文摘TiAl-based alloys are potentially used as high-temperature structural materials with a high specific strength in the range of^900°C.However,the mechanical properties of TiAl-based alloys are extremely anisotropic with respect to the lamellar orientation of the microstructures.A balance combination of room-temperature ductility and strength can be achieved when the lamellar orientation are aligned parallel to the tensile stress direction.Lamellar orientation control of TiAl-based alloys by directional solidification technique has been widely studied in recent years.Two different directional solidification processes can be used to modify the lamellar orientation.One is a seeding technique and the other is adjusting the solidification path.This paper reviews the principles of the two methods and their progress.The influence of alloy composition and solidification parameters on lamellar orientation control is also discussed. | Su Yanqing Liu Tong Li Xinzhong Chen Ruirun Ding Hongsheng Guo Jingjie Fu Hengzhi | 2014 | China Foundry2014，11，4： | 7 |
| 6 | The corrosion behavior of Ti-6Al-3Nb-2Zr-1Mo alloy:Effects of HCl concentration and temperature显示文摘Investigation about the corrosion behavior of Ti alloys in different ambient environment is of great significance for their practical application.Herein,we systematically investigate the corrosion behavior of a newfound Ti-6 Al-3 Nb-2 Zr-1 Mo(Ti80)alloy in hydrochloric acid(HCl)ranging from 1.37 to 7 M,and temperature ranging from 25 to 55℃,by means of electrochemical measurements,static immersion tests and surface analysis.Results manifest that increasing either HCl concentration or temperature can accelerate the corrosion of Ti80 alloy via promoting the breakdown of native protective oxide film and then further facilitating the active dissolution of Ti80 matrix.According to potentiodynamic polarization curves,Ti80 alloy displays a spontaneous passive behavior in 1.37 M HCl at 25℃,compared to a typical active-passive behavior under the other conditions.As indicated by cathodic Tafel slope,the rate determining step for cathodic hydrogen evolution reaction is likely the discharge reaction step.The apparent activation energies obtained from corrosion current density and maximum anodic current density for Ti80 alloy in 5 M HCl solution are 62.4 and 55.6 kJ mol-1,respectively,which signifies that the rate determining step in the corrosion process of Ti80 alloy is mainly determined by surface-chemical reaction rather than diffusion.Besides,the electrochemical impedance spectroscopy tests demonstrate that a stable and compact oxide film exists in 1.37 M HCl at 25℃,whereas a porous corrosion product film forms under the other conditions.Overall,the critical HCl concentration at which Ti80 alloy can maintain passivation at 25℃can be determined as a value between 1.37 and 3 M.Furthermore,the corroded surface morphology characterization reveals that equiaxedαphase is more susceptible to corrosion compared to intergranularβphase due to a lower content of Nb,Mo,and Zr in the former. | Baoxian Su Binbin Wang Liangshun Luo Liang Wang Yanqing Su Fuxin Wang Yanjin Xu Baoshuai Han Haiguang Huang Jingjie Guo Hengzhi Fu | 2021 | Journal of Materials Science & Technology2021，，15： | 5 |
| 7 | Annealed microstructure dependent corrosion behavior of Ti-6Al-3Nb-2Zr-1Mo alloy显示文摘Corrosion resistance of titanium(Ti)alloys is closely connected with their microstructure which can be adjusted and controlled via different annealing schemes.Herein,we systematically investigate the specific effects of annealing on the corrosion performance of Ti-6 Al-3 Nb-2 Zr-1 Mo(Ti80)alloy in 3.5 wt.%NaCl and 5 M HCl solutions,respectively,based on open circuit potential(OCP),potentiodynamic polarization,electrochemical impedance spectroscopy(EIS),static immersion tests and surface analysis.Results indicate that increasing annealing tempe rature endows Ti80 alloy with a higher volume fraction ofβphase and finerαphase,which in turn improves its corrosion resistance.Surface characterization demonstrates thatβphase is more resistant to corrosion thanαphase owing to a higher content of Nb,Mo,and Zr in the former;additionally,the decreased thickness of a phase alleviates segregation of elements to further restrain the micro-galvanic couple effects betweenαandβphases.Meanwhile,the influential mechanisms of environmental conditions on corrosion of Ti80 alloy are discussed in detail.As the formation of a highly compact and stable oxide film on surface,annealed Ti80 alloys exhibit a low corrosion current density(10^(-6)A/cm^(2))and high polarization impedance(10^(6)Ω·cm^(2))in 3.5 wt.%NaCl solution.However,they suffer severe corrosion in 5 M HCl solution,resulting from the breakdown of native oxide films(the conversion of TiO_(2)to aqueous Ti^(3+)),active dissolution of substrate Ti to aqueous Ti^(3+)and existence of micro-galvanic couple effects.Those findings could provide new insights to designing Ti alloys with high-corrosion resistance through microstructural optimization. | Baoxian Su Liangshun Luo Binbin Wang Yanqing Su Liang Wang Robert O.Ritchie Enyu Guo Ting Li Huimin Yang Haiguang Huang Jingjie Guo Hengzhi Fu | 2021 | Journal of Materials Science & Technology2021，，3： | 5 |
| 8 | Optimizing microstructure,shrinkage defects and mechanical performance of ZL205A alloys via coupling travelling magnetic fields with unidirectional solidification显示文摘ZL205A alloys tend to form disordered and defective microstructure due to the large solidification intervals and multi-phase.Accordingly,finding ways to effectively optimize the microstructure and mechanical performance is of great significance.In this regard,the coupling of travelling magnetic fields(TMF)with unidirectional solidification was used to continuously regulate the mushy zones of ZL205A alloys.Additionally,experiments are combined with simulations to systematically reveal the mechanisms on the optimizations at each stage of solidification process.Current findings demonstrate that different directional strong melt flows generated by TMF are responsible for these optimizations.Additionally,the effects of TMF on microstructure are different at each stage of solidification process.Specifically,downward TMF coupled with unidirectional solidification can refine and uniform the microstructure,decrease the formation of precipitation,promote the growth consistency of matrix phaseα-Al growing along the<001>crystal orientation,reduce the secondary dendrites and overlaps between dendrites,eliminate the shrinkage defects,and increase the ultimate tensile strength,yield strength,elongation and hardness from 198.3 MPa,102.2 MPa,7.5%and 82.3 kg mm^(-2)without TMF to 225.5 MPa,116.1 MPa,13.6%and 105.2 kg mm^(-2).Contrastively,although upward TMF can reduce Al3Ti and refineα-Al,it increases the formation of Al6Mn,Al2Cu,secondary dendrites,overlaps between dendrites,and shrinkage defects;then it deflects and disorders the growth ofα-Al,further to decrease the overall performance of alloys. | Lei Luo Liangshun Luo Yanqing Su Lin Su Liang Wang Jingjie Guo Hengzhi Fu | 2021 | Journal of Materials Science & Technology2021，，15： | 4 |
| 9 | Influence of silicide on fracture behavior of a fully lamellar Ti-46Al-0.5W-0.5Si alloy显示文摘The fracture behavior of fully lamellar binaryγ-TiAl alloys is extremely anisotropic with respect to the lamellar orientation.For the fully lamellar Ti-46Al-0.5W-0.5Si alloy,the existence of silicide clusters plays a critical role on the fracture behavior.In the present study,tensile test and three point bending test were performed at room temperature with the loading axis parallel and perpendicular to the lamellar orientation,respectively.To investigate the influence of silicide clusters on the initiation and propagation of cracks,the fracture surface and the cracks adjacent to the fracture zone of the specimens have been analyzed.Results show that the fracture process is related to the morphology and distribution of the silicide clusters.Crack preferentially initiates at and propagates along the interface of silicide andα 2 /γlamellar with the loading axis perpendicular to the length direction of silicide.While the silicide can prevent the propagation of cracks from running across with the crack growth direction perpendicular to the length direction of silicide. | Chen Hui Su Yanqing Luo Liangshun Li Xinzhong Wang Zhantao Guo Jingjie Fu Hengzhi | 2012 | China Foundry2012，9，2： | 4 |
| 10 | As-cast structure refinement of Ti-46Al alloy by hafnium and boron additions显示文摘The influence of Hf and B on the solidifi cation structure of cast Ti-46Al alloys was investigated.The results show that the coupling effect of Hf and B changes the solidifi cation structure morphology and strongl ref ines the grain size.When the Hf+B contents were increased from 0 + 0.0 to 3 + 0.2,5 + 0.6 and 7 + 1.0(in at.%),the solidification structure morphology changed from coarse columnar dendrite to fine columnar dendrite then to equiaxed dendrite,and further to f ine near granular grain whilst the average grain size decreased to 20 μm It is concluded that the columnar dendrite refinement is due to the effect of Hf and B on the decrease of A diffusion coeffi cient in the melt.The f ine near granular grain formation is attributed to the combined constitutiona supercooling formed by Al and B segregation that is strengthened by Hf and B additions at the solid/liquid interface during solidifi cation,and the TiB2 precipitates acting as heterogeneous nuclei. | Zhang Li Su Yanqing Yang Huimin Luo Liangshun Guo Jingjie | 2009 | China Foundry2009，6，2： | 3 |
| 11 | ANALYSIS OF OVERFLOW CRITICAL VALUE FOR TiAl BASED ALLOY MELT DURING PROCESS OF CENTRIFUGAL CASTING显示文摘1INTRODUCTIONTiAlbasedaloyshaveatractedagreatdealofatentionbecauseoftheirpotentialyatractivepropertiesforhightemperaturestru... | Guo, Jingjie Sheng, Wenbin Su, Yanqing Ding, Hongsheng Jia, Jun | 1999 | 中国有色金属学会会刊:英文版1999，9，2： | 3 |
| 12 | Efect of growth rate on characteristic lengths of microstructure in directionally solidiied Ti-46Al-2Cr-2Nb-0.2B alloy显示文摘The microstructure of TiAl based alloys is sensitive to growth rates.In this paper,Bridgman directional solidification of Ti-46Al-2Cr-2Nb-0.2B(at.%)alloy was carried out at a constant temperature gradient(G)to investigate the effects of various growth rates(v)on characteristic lengths(primary dendritic arm spacing,secondary dendritic arm spacing and lamellar spacing)of the microstructure.Results show that under the experimental conditions of G=18 K·mm-1and v=15μm·s-1to 70μm·s-1,the primary phase of directionally solidified Ti-46Al-2Cr-2Nb-0.2B alloy isαphase,the values of primary dendritic arm spacing(λl),secondary dendritic arm spacing(λ2)and lamellar spacing(λla)decrease with the increase in growth rate.The results were compared with theoretical models and similar experimental results of TiAl based alloys.The Bouchard-Kirkaldy model agrees well with the relationship between primary dendritic arm spacing and growth rate obtained in the experiment;the relationship between them can be expressed byλl=758.6v-0.39.The relationship between the secondary dendritic arm spacing and the growth rate can be expressed byλ2=113.9v-0.45,while the relationship between the lamellar spacing and growth rate can be expressed byλla=22.88v-0.94. | Zhang Yuan Li Xinzhong Guo Jingjie Su Yanqing Fu Hengzhi | 2013 | China Foundry2013，10，5： | 3 |
| 13 | Influence of columnar grain boundary on fracture behavior of as-cast fully lamellar Ti-46Al-0.5W-0.5Si alloy显示文摘The fracture behavior of fully lamellar γ-TiAl alloys depends on the angle between the lamellar orientation and loading axis,but the role of the presentation of grain boundary cannot be ignored.To investigate the influence of the grain boundary on the initiation and propagation of cracks,the tensile test of the alloy was conducted at room temperature with loading axis parallel and perpendicular to the lamellar orientation,respectively.The cracks adjacent to the fracture zone of the tensile specimens have been investigated to analyze the fracture behavior.Results show that the grain boundary has dual influences on the fracture behavior.When the loading axis is parallel to the lamellar orientation,cracks are preferentially initiated at and propagate along the grain boundaries.When the loading axis is perpendicular to the lamellar orientation,the grain boundaries can prevent the propagation of cracks from running across.Additionally,serrated-shape grain boundaries have a better inhibiting effect on the propagation of cracks than planar boundaries. | Chen Hui Su Yanqing Luo Liangshun Li Xinzhong Liu Jiangping Guo Jingjie Fu Hengzhi | 2012 | China Foundry2012，9，1： | 3 |
| 14 | Study on traveling magnetic field casting of sheet components显示文摘The distribution of a magnetic field over an inductor used for sheet castings has been investigated experimentally.With an increase in height from the surface, the magnetic field density decreases according to the exponential law.In the transverse direction, the magnetic field density is approximately uniform except near the edges.The magnetic field density is direct proportional to the number of turns multiplied by the current in amperes.Ferro-magnetic material in the upper mould can enhance the magnetic field density.Under the electromagnetic force, the mould-filling process of sheet casings has been studied by physical simulation method.The difference in filling capability between gravity casting and travelling magnetic field casting has been studied.The electromagnetic force can enhance the filling process, but it also brings a problem.With an increase in the magnetic field density, the surface quality of the aluminum alloy sheet castings becomes poor.The reason is discussed. | Su Yanqing Xu Yanjin Zhao Lei Zhang Tiejun Wu Shiping Guo Jingjie | 2010 | China Foundry2010，7，3： | 3 |
| 15 | EVAPORATION BEHAVIOR OF COMPONENTS IN Ti-15-3 MELT DURING ISM PROCESS显示文摘INTRODUCTIONMetastableβtitaniumaloysarenowfindingprogresivelymoreapplications,especialyowingtotheirgoodformingproperties[1].T... | Guo, Jingjie Liu, Yuan Su, Yanqing Ding, Hongsheng Jia, Jun | 1998 | 中国有色金属学会会刊:英文版1998，8，4： | 2 |
| 16 | Coarsening Manner and Microstructure Evolution of Al-In Hypermonotectic Alloy during Rapidly Cooling Process显示文摘A numerical model reflecting the real physical processes well has been developed to predict the coarsening manner of the second phase droplets and the microstructural evolution under the common action of nucleation, diffusional growth, colliding coagulation during rapid cooling Al-ln hypermonotectic alloys. The model reflects the real physical processes well and is also applicable to other immiscible alloys. | Yuan LIU, Jingjie GUO, Jun JIA, Yanqing SU, Hongsheng DING, Jiuzhou ZHAO and Xiang XUESchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | 2002 | Journal of Materials Science & Technology2002，18，3： | 2 |
| 17 | Effect of power parameter and induction coil on magnetic field in cold crucible during continuous melting and directional solidification显示文摘Bottomless electromagnetic cold crucible is a new apparatus for continuous melting and directional solidification;however,improving its power efficiency and optimizing the configuration are important for experiment and production.In this study,a 3-D finite element (FE) method based on experimental verification was applied to calculate the magnetic flux density (Bz).The effects of the power parameters and the induction coil on the magnetic field distribution in the cold crucible were investigated.The results show that higher current intensity and lower frequency are beneficial to the increase of Bz at both the segment midpoint and the slit location.The induction coil with racetrack section can induce greater Bz,and a larger gap between the induction coil and the shield ring increases Bz.The mechanism for this effect is also discussed. | Chen Ruirun Yang Jieren Ding Hongsheng Huang Feng Su Yanqing Guo Jingjie Fu Hengzhi | 2012 | China Foundry2012，9，1： | 2 |
| 18 | Forming Mechanism of Gaseous Defect in Ti-48Al-2Cr-2Nb Exhaust Valves Formed with Permanent Mold Centrifugal Casting Method显示文摘A method combining theoretical analysis with experiment is adopted and the flowing process of Ti-48A1-2Cr-2Nb alloy melt poured in a permanent mould during the centrifugal casting process has been analyzed. A mathematical model of the filling process is established and the forming mechanism of internal gaseous defect is summarized. The results of calculation show that the melt fills the mould with varying cross-section area and inclined angle. The filling speed of the cross-section is a function of filling time. The cross-section area is directly proportional to the filling speed and the inclined angle is inversely proportional to the filling speed at a given rotating speed of the platform. Both of them changes more obvious near the mould entrance. The gaseous defect can be formed in several ways and the centrifugal field has an important influence on the formation of the defect. In addition, the filling process in centrifugal field has been verified by wax experiments and the theoretical analysis are consistent with experimental results. | Research Notes Wenbin SHENG, Jingjie GUO, Yanqing SU, Hongsheng DING and Jun JIA School of Materials Science and Engineering, Harbin Institute of Technology. Harbin 150001, China | 2001 | Journal of Materials Science & Technology2001，17，5： | 2 |
| 19 | Enhanced strength and ductility in Ti46Al4Nb1Mo alloys via boron addition显示文摘To improve the strength and ductility of Ti Al alloys by second phase, Ti46 Al4 Nb1 Mo alloys doped with different B content(0.4%, 0.8%, 1.2%, 1.6% and 2.0%, atomic percent, hereafter in at.%, referred to as TNMx B) were prepared. Macro/microstructure evolution, mechanical properties and deformation mechanisms of the alloys were studied systematically. Results showed that the microstructure of TNM-0.4 B and TNM-0.8 B alloy remained columnar dendrites, and the secondary dendritic arms of columnar grains were more obvious. When the content of B is 1.2%, the columnar dendrites transformed to equiaxed grains, and theα2/γ lamellae colony size was further refined in TNM-1.6 B and TNM-2.0 B alloy. The morphologies and kinds of the borides were changed with increasing B content, XRD results showed that Ti B phase appeared with 1.6%B content, and both Ti B and Ti B2 phase formed in TNM-2.0 B alloy. There were straight and curved Ti B phases located around grain boundaries in TNM-0.4 B and TNM-0.8 B alloy, and when the content of B increased to 1.2%, the curved Ti B phases were reduced, while the tiny and straight Ti B phases increased. With further increasing B content to 1.6% and 2.0%, the tiny and straight Ti B phases were coarser. Compressive testing results showed that the mechanical properties of the TNM alloy were enhanced with increasing B content. The maximum strength and strain of TNM alloy were 2339 MPa and33.7% with 1.6% B addition. The compressive strength and strain were mainly enhanced via refinement of lamellar colony and formation of Ti B, and it is found that pile-up of dislocations and deformed twins promoted by Ti B are predominant in improving the mechanical properties of TNM alloys with higher strength and strain. | Yingmei Tan Ruirun Chen Hongze Fang Yangli Liu Hongzhi Cui Yanqing Su Jingjie Guo Hengzhi Fu | 2022 | Journal of Materials Science & Technology2022，，7： | 2 |
| 20 | Effect of hafnium addition on solidification structure of cast Ti-46Al alloys显示文摘To investigate the effect of hafnium addition on the solidif ication structure, Ti-46Al alloys with nominal compositions of Ti-46Al-xHf (x = 0, 3, 5, 7) (at.%) were arc-melted into small ingots in an argon atmosphere. The characteristics of the macrostructures and microstructures were studied using a linear intercept method, OM, SEM (BSE), XRD and TEM. The results showed that the ingots with Hf have near lamellar microstructure in columnar and dendrite morphology. The hafnium concentration has a strong effect on the columnar spacing refi nement. Increasing Hf from 0 to 7 (at.%), the columnar spacing can be reduced from~1000 to~400 μm. Constitute phases of the ingots are α2, a small amount of B2 and c. Most of the B2 phases, richer in Hf and leaner in Al and Ti, exist on the node of the dendrite core in block shape and a little across the lamellar colonies in stick shape. The c phases exist on the boundaries of lamellar colonies in small cellular shape. There also exists a segregation of Hf on the columnar and dendrite core. Particularly, both the α- and β-phase form from the melt as prior phases. The possible phase sequencing during solidif ication and solid-state transformations with Hf is given in this paper. | Su Yanqing Zhang Li Guo Jingjie K. Maruyama Li Zhiming | 2008 | China Foundry2008，5，4： | 2 |
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