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| 1 | Effect of Trace Sc and Zr on the Mechanical Properties and Microstructure of A1 Alloy 2618显示文摘An experimental 2618(Al-Cu-Mg-Fe-Ni) alloy added with trace Sc and Zr was prepared by ingot metallurgy (IM) method. The aging behavior of the alloy was studied by Vickers hardness measurement at 200℃ and 300℃. and the tensile properties of alloy specimens were measured at 20℃, 200℃, 250℃ and 300℃. The microstructure was observed by using optical microscope, SEM and TEM. It was found that the addition of Sc and Zr to 2618 alloy resulted in a primary Al3(Sc,Zr) phase which could refine the grain because it acts as nuclei of heterogeneous crystallization in the melt during solidification. The secondary Al3(Sc,Zr) particles were full coherent with matrix and had obvious precipitation hardening effect. They also made the S’ phase precipitate more homogeneous. So the strength of alloy increases at both ambient and elevated temperatures without a decrease of ductility. The ductile fracture of alloy occurs by microvoid nucleation, growth and coalescence, so the microvoid coalescence is the dominant fracture mechanism. | Kun YU, Songrui LI and Wenxian LI (Department of Materials Science and Engineering, Central South University of Technology, Changsha 410083, China) | 2000 | Journal of Materials Science & Technology2000，16，4： | 6 |
| 2 | Effect of trace Sc and Zr on aging behavior and tensile properties of 2618 alloy显示文摘The aging behavior of 2618 (Al Cu Mg Fe Ni) alloy added trace Sc and Zr was studied by Vicker’s hardness measurement at 200 and 300 ℃, and the tensile properties(yield strength, ultimate tensile strength and elongation) of alloys were measured at 20, 200, 250 and 300 ℃. The microstructures were observed by using optical microscope, SEM and TEM. It was found that the addition of Sc and Zr to 2618 alloy resulted in a uniform distribution of fine coherent Al 3(Sc,Zr) precipitates which had obvious aging hardening effect and made the S’ phase precipitate more homogeneously. The strength of alloy increased at ambient and elevated temperature without a decrease of ductility because of the precipitation strengthening and thermal stability of Al 3(Sc,Zr) particles. The ductile fracture of alloy occurred by microviod nucleation, growth and coalescence, so the microvoid coalescence was the dominant fracture mechanism. Al 3(Sc,Zr) particles could inhabit the recrystallization process of alloy 2618. | Yu Kun(余琨) Li Songrui(李松瑞) Li Wenxian(黎文献) Xiao Yude(肖于德) | 1999 | 中国有色金属学会会刊:英文版1999，9，3： | 5 |
| 3 | MICROSTRUCTURES AND MECHANICAL PROPERTIES OF SPUN PIPE BLANKS OF RS AlFeX ALLOY显示文摘MICROSTRUCTURESANDMECHANICALPROPERTIESOFSPUNPIPEBLANKSOFRSAlFeXALLOY①XiaoYude,LiWenxian,LiSongruiandWangRicuDepartmentofMater... | Xiao, Yude Li, Wenxian Li, Songrui Wang, Ricu Luo, Qingying | 1998 | 中国有色金属学会会刊:英文版1998，8，1： | 5 |
| 4 | SECOND PHASES OF RAPIDLY SOLIDIFIED AlFeCrZrVSi ALLOY AND THEIR THERMAL STABILITIES显示文摘SECONDPHASESOFRAPIDLYSOLIDIFIEDAlFeCrZrVSiALLOYANDTHEIRTHERMALSTABILITIESXiaoYudeLiSongruiLiWenxianZengZhihuaMaZhengqing(Depa... | Xiao Yude Li Songrui Li Wenxian Zeng Zhihua Ma Zhengqing(Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083, China) | 1998 | Journal of Central South University1998，10，1： | 4 |
| 5 | All-optical logic devices based on black arsenic-phosphorus with strong nonlinear optical response and high stability显示文摘The Kerr nonlinearity in two-dimensional(2D)nanomaterials is emerging as an appealing and intriguing research area due to their prominent light processing,modulation,and manipulation abilities.In this contribution,2D black arsenic-phosphorus(B-AsP)nanosheets(NSs)were applied in nonlinear photonic devices based on spatial self-phase modula-tion(SSPM)method.By applying the Kerr nonlinearity in 2D B-AsP,an all-optical phase-modulated system is proposed to realize the functions of“on”and“off”in all-optical switching.By using the same all-optical phase-modulated system,another optical logic gate is proposed,and the logical“or”function is obtained based on the 2D B-AsP NSs dispersions.Moreover,by using the SSPM method,a 2D B-AsP/SnS_(2) hybrid structure is fabricated,and the result illustrates that the hybrid structure possesses the ability of the unidirectional nonlinear excitation,which helps in obtaining the function of spatial asymmetric light propagation.This function is considered an important prerequisite for the realization of diode functionalization,which is believed to be a factor in important basis for the design of isolators as well.The initial investig-ations indicate that 2D B-AsP is applicable for designing optical logical devices,which can be considered as an import-ant development in all-optical information processing. | Leiming Wu Taojian Fan Songrui Wei Yijun Xu Ye Zhang Dingtao Ma Yiqing Shu Yuanjiang Xiang Jun Liu Jianqing Li Krassimir Panajotov Yuwen Qin Han Zhang | 2022 | Opto-Electronic Advances2022，5，1： | 3 |
| 6 | Production,Properties and Microstructures of Mg-RE-Zn-Zr(RE=MM,Nd) Alloy显示文摘The Mg-MM and Mg-Nd master alloys were prepared through the ingot metallurgy method under the protection of a special flux. The thermodynamic behaviors of different rare earth elements in the molten Mg alloys were investigated.Two experimental alloys, Mg-3.0 wt pct MM-0.7 wt pct Zn-0.7 wt pct Zr and Mg-2.8 wt pct Nd-0.7 wt pct Zn0.7 wt pct Zr, were prepared. The hardness and tensile properties of experimental alloys were measured and the microstructures were observed. The results showed that the rare earth elements could react greatly with the Mg chloride in the flux. The Mg-Nd-Zn-Zr alloy displayed a good aging hardening effect. The dispersed metastable phase β' (Mg3Nd) is an important strengthening phase to improve the tensile properties of this alloy. So the Mg-Nd-Zn-Zr alloy has better tensile properties and elongation than those of the Mg-MM-Zn-Zr alloy, and the ductile fracture character could be observed. The microvoid coalescence is the dominant fracture mechanism in this alloy. | Kun YU, Wenxian LI and Songrui LICollege of Materials Science and Engineering, Central South University, Changsha 410083, China | 2002 | Journal of Materials Science & Technology2002，18，4： | 2 |
| 7 | Effects of Transition Metals Fe, Ni, Sc and Zr on the Microstructure and Mechanical Properties of 2618 Aluminum Alloy显示文摘 | Yu Kun Li Songrui Li Wenxian | 2000 | Rare Metal Materials and Engineering(稀有金属材料与工程)2000，29，3： | 1 |
| 8 | Mechanical properties and microstructure of aluminum alloy 2618 with Al3(Sc,Zr) phases显示文摘 | Yu Kun Li Wenxian Li Songrui | 2004 | Materials Science and Engineering A2004，368，： | 1 |
| 9 | Mechanical properties and microstructure of aluminum alloy 2618 with Al 3 (Sc, Zr) phases显示文摘 | Kun Yu Wenxian Li Songrui Li Jun Zhao | 2003 | Materials Science & Engineering A2003，，1： | 1 |
| 10 | Mechanical properties and microstructure of aluminum alloy 2618 with Al3 (Sc, Zr) phases显示文摘 | Kun Yu Wenxian Li Songrui Li | 2004 | Materials Science and Engineering A2004，368，： | 1 |
| 11 | Insight into sulfur and iron effect of binary nickel-iron sulfide on oxygen evolution reaction显示文摘Nickel-iron sulfide has shown attractive activity in electrocatalytic oxygen evolution reaction(OER).However,the effects of low valence sulfur(S^(2−))and metal species on OER in binary nickel-iron sulfide have rarely been systematically studied.Works based on post-catalysis characterization have led to the assumption that the real active species are nickel-iron oxyhydroxide,and that nickel-iron sulfide acts only as a precatalyst.Therefore,to study the role of S,Ni,and Fe for the development of nickel-iron sulfide catalyst is of self-evident importance.Herein,a facile solvothermal method is used to synthesize acetylene black coated with nickel-iron sulfide nanosheets.Electrochemical tests show that the presence of low valence S species makes the catalyst have faster OER kinetics,larger active area,and intermediate active species adsorption area.Therefore,the present study reveals the enhancing effect of low valence sulfur species(S^(2−))on OER in binary nickel-iron sulfide.In situ Raman spectroscopy shows that the generation ofγ-NiOOH intermediate is essential and Fe does not directly participate in the oxygen production.Density functional theory(DFT)calculation shows that Ni-OH deprotonation is a rate-determining step for both binary nickel-iron sulfide and nickel sulfide.The addition of Fe into NiSx lightly increases the charge transfer of Ni atom to O atom,which makes deprotonation easier and thereby improves the OER performance. | Qikang Wu Songrui Wang Jiahui Guo Xueqing Feng Han Li Shanshan Lv Yan Zhou Zheng Chen | 2022 | Nano Research2022，15，3： | 1 |
| 12 | ISOTHERMAL PHASE TRANSFORMATION IN Au-Si AMORPHOUS ALLOY显示文摘Electric resistivity measurements and X-ray diffraction analysis were performed to study theisothermal phase transformation in amorphous Au-Si ribbons with eutectic composition pre-pared using melt-spinning technique.A series of phase transformations take placespontaneously at room temperature and accelerate at elevated temperatures.Four stages ofthe transformation from amorphous state to the equilibrium state can be distinguished.Dis-cussion on the structural character of the metastable phases indicates that Hume-Rotheryelectron compounds and size factor compounds could form during isothermal aging. | Li Songrui Gao Shigu Gao Xiujuan Central-South University of Technology,Changsha,China in revised form 9 April 1987] | 1989 | Acta Metallurgica Sinica(English Letters)1989，2，8： | 0 |
| 13 | HARDENING OF RAPID SOLIDIFICATION Al-Fe-V-Si ALLOY EXPOSED AT ELEVATED TEMPERATURE显示文摘HARDENINGOFRAPIDSOLIDIFICATIONAl-Fe-V-SiALLOYEXPOSEDATELEVATEDTEMPERATURE￥XuYiheng;LongChunguang;LiSongrui;LiWenxian;YangShib... | Xu, Yiheng Long, Chunguang Li, Songrui Li, Wenxian Yang, Shibao | 1996 | 中国有色金属学会会刊:英文版1996，6，4： | 0 |
| 14 | DEFORMATION AND FRACTURE OF DISPERSION-STRENGTHENED HIGH-TEMPERATURE AI-8.5 Fe-1.3 V-1.7 Si ALLOY显示文摘The fracture behavior of Al-8. 5Fe-1. 3V-1.7Si (mass fraction, %) alloy under different deforming conditions was investigated. The results show that the propagation mode of the main crack was correlated with the orientation of prior powder boundaries (PPB’s) when the specimen ruptured. For the L-direction tensile specimen, the LT-oriented microcrack along PPB’s didn’t affect the main crack’s extensions the LSoriented microcrack might lead to unusual failure; the TS-oriented boundary was ready to become the lowenergy propagating path for the main crack. Hot rolling resulted in a larger increase of the cohesion strength of LS-and TS-oriented boundaries than that of LT-oriented boundary, thus causing the corresponding change of fracture mode at a certain deformation amount (30%). The different variation tendency for fracture strength and elongation arised from this change of fracture mode and subsequent work hardening. | Zeng Yuxiao Li Wenxian Li Songrui Xiao Yude Chen Linghui (Department of Materials Science and Engineering, Central South University of Technology, Changsha 410083, China) | 1997 | Journal of Central South University1997，9，2： | 0 |
| 15 | Squat motion of a bipedal robot using real-time kinematic prediction and whole-body control显示文摘Squatting is a basic movement of bipedal robots,which is essential in robotic actions like jumping or picking up objects.Due to the intrinsic complex dynamics of bipedal robots,perfect squatting motion requires high-performance motion planning and control algorithms.The standard academic solution combines model predictive control(MPC)with whole-body control(WBC),which is usually computationally expensive and difficult to implement on practical robots with limited computing resources.The real-time kinematic prediction(RKP)method is proposed,which considers upcoming reference motion trajectories and combines it with quadratic programming(QP)-based WBC.Since the WBC handles the full robot dynamics and various constraints,the RKP only needs to adopt the linear kinematics in the robot's task space and to softly constrain the desired accelerations.Then,the computational cost of derived closed-form RKP is greatly reduced.The RKP method is verified in simulation on a heavy-loaded bipedal robot.The robot makes rapid and large-amplitude squatting motions,which require close-to-limit torque outputs.Compared with the conventional QP-based WBC method,the proposed method exhibits high adaptability to rough planning,which implies much less user interference in the robot's motion planning.Furthermore,like the MPC,the proposed method can prepare for upcoming motions in advance but requires much less computation time. | Wenhan Cai Qingkai Li Songrui Huang Hongjin Zhu Yong Yang Mingguo Zhao | 2022 | IET Cyber-Systems and Robotics2022，4，4： | 0 |
| 16 | MICROSTRUCTURES AND MECHANICAL PROPERTIES OF RAPIDLY SOLIDIFIED Al-Fe-Cr-Zr-V-Si ALLOY AND THEIR THERMAL STABILITY显示文摘1INTRODUCTIONThemechanicalpropertiesoftheconventionalaeronauticalhighstrengthaluminiumalloysdegeneraterapidlywhenthetemper... | Xiao, Yude Li, Songrui Li, Wenxian Wang, Richu | 1998 | 中国有色金属学会会刊:英文版1998，8，3： | 0 |
| 17 | A new LFSR based high-frequency test method for RSFQ circuit显示文摘Rapid single flux quantum(RSFQ)circuits have the advantages of high speed and low power consumption.The typical frequency of the RSFQ circuits is tens of GHz.Therefore,it is necessary to reliably test the highfrequency performance of RSFQ circuits simply and effectively.This paper proposes a new on-chip highfrequency testing method,which uses pseudo-random sequences generated by linear feedback shift register(LFSR)as the test vectors,and the output shift registers(SRs)to store the last piece of high-frequency testing result and read out it at low-frequency.Unlike the traditional high-frequency demonstration method of using the Input/Output SRs,our testing system can automatically generate a large number of test vectors to test the circuit at high frequency at low cost,making the whole high-frequency demonstration more reliable and convincing.On the other hand,this method is also a feasible and straightforward on-chip high-frequency test method for various RSFQ circuits.This work verified the proposed method,and the highest test frequency can reach 54 GHz while the circuit shows good operating margins. | Liyun Chen Songrui Li Liliang Ying Minghui Niu Huanli Liu Hui Zhang Xue Zhang Xiaoping Gao Jie Ren Wei Peng Zhen Wang | 2022 | Superconductivity2022，，2： | 0 |
| 18 | MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A EXTRUDED RAPIDLY SOLIDIFIED AIFeVSi ALLOY显示文摘MICROSTRUCTUREANDMECHANICALPROPERTIESOFAEXTRUDEDRAPIDLYSOLIDIFIEDAIFeVSiALLOY￥Zeng,Yuxiao;Li,Songrui;Li,Wenxian;Wang,Richu;Hu... | Zeng, Yuxiao Li, Songrui Li, Wenxian Wang, Richu Hu, Miao(Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083) | 1995 | 中国有色金属学会会刊:英文版1995，5，3： | 0 |
| 19 | Pore structure of low‑permeability coal and its deformation characteristics during the adsorption–desorption of CH4/N2显示文摘The pore structure of coal plays a key role in controlling the storage and migration of CH4/N2.The pore structure of coal is an important indicator to measure the gas extraction capability and the gas displacement efect of N2 injection.The deformation characteristic of coal during adsorption–desorption of CH4/N2 is an important factor afecting CH4 pumpability and N2 injectability.The pore structure characteristics of low-permeability coal were obtained by fuid intrusion method and photoelectric radiation technology.The multistage and connectivity of coal pores were analyzed.Subsequently,a simultaneous test experiment of CH4/N2 adsorption–desorption and coal deformation was carried out.The deformation characteristics of coal were clarifed and a coal strain model was constructed.Finally,the applicability of low-permeability coal to N2 injection for CH4 displacement technology was investigated.The results show that the micropores and transition pores of coal samples are relatively developed.The pore morphology of coal is dominated by semi-open pores.The pore structure of coal is highly complex and heterogeneous.Transition pores,mesopores and macropores of coal have good connectivity,while micropores have poor connectivity.Under constant triaxial stress,the adsorption capacity of the coal for CH4 is greater than that for N2,and the deformation capacity of the coal for CH4 adsorption is greater than that for N2 adsorption.The axial strain,circumferential strain,and volumetric strain during the entire process of CH4 and N2 adsorption/desorption in the coal can be divided into three stages.Coal adsorption–desorption deformation has the characteristics of anisotropy and gas-diference.A strain model for the adsorption–desorption of CH4/N2 from coal was established by considering the expansion stress of adsorbed gas on the coal matrix,the compression stress of free gas on the coal matrix,and the expansion stress of free gas on micropore fractures.N2 has good injectability in low-permeability coal seams and has the dual functions of improving coal seam permeability and enhancing gas fow,which can signifcantly improve the efectiveness of low-permeability coal seam gas control and promote the efcient utilization of gas resources. | Pengfei Ji Haifei Lin Xiangguo Kong Shugang Li Biao Hu Pei Wang Di He Songrui Yang | 2023 | International Journal of Coal Science & Technology2023，10，4： | 0 |
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