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Enhanced electrical,mechanical and tribological properties of Cu-Cr-zr alloys by continuous extrusion forming and subsequent aging treatment

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Journal of Materials Science & Technology 2022年第15期110卷 187-197页

作者： Zhe Shen Zhongze Lin Peijian Shi Jiale Zhu Tianxiang Zheng Biao Ding Yifeng guo Yunbo Zhong State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Shanghai Key Laboratory of Advanced Ferrometallurgy Shanghai UniversityShanghai 200444China

As a promising material for the new generation of high-speed railway contact wires,the comprehensive optimization of the electrical conductivity,strength,hardness and wear resistance of the Cu-Cr-zr alloy has received extensive *** this paper,a high-performance Cu-1Cr-0.1zr alloy with an ultimate tensile strength of 599.1 MPa,a uniform elongation of 8.6%,a microhardness of 195.7 HV_(0.2) and an electrical conductivity of 80.07%IACS was achieved by the continuous extrusion forming(CEF)and subsequent peak-aging *** grain refinement strengthening,dislocation strengthening and precipitation strengthening are identified to be responsible for the excellent electrical and mechanical properties of Cu-Cr-zr *** wear behavior of Cu-Cr-zr alloy was investigated by examining the evolution of worn surface morphology and subsurface *** microhardness(H)and reduced elastic modulus(E_(r))of the subsurface below the worn surface measured by nanoindentation were calculated to gage the tribological performance of Cu-Cr-zr *** show that the continuously extruded and subsequently peak-aged specimen has the best wear resistance,which indicates that the tribological properties of CuCr-zr alloy strongly depend on its strength and *** can be concluded that the CEF and subsequent aging treatment process provides a new and high-efficiency procedure for the continuous preparation of Cu-Cr-zr alloys.

关键词： Cu-Cr-zr alloy Continuous extrusion Electrical conductivity Mechanical properties Tribological properties

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Microstructure and mechanical properties of a novel zr-based bulk metallic glass composite

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Chinese Science Bulletin 2005年第24期50卷 2804-2808页

作者： SUN Yufeng WANG Yuren guo Jian WEI Bingchen LI Weihuo National Microgravity Lab Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China Research Central for Materials Department of Materials Science and Engineering Zhengzhou University Zhengzhou 450002 China Department of Materials and Chemical Engineering Zhongyuan In- stitute of Technology Zhengzhou 450002 China

zr48.5Cu46.5Al5 bulk metallic glass (BMG) com- posites with diameters of 3 and 4 mm were prepared through suction casting in an arc melting furnace by modulating the alloy composition around the monothetic BMG composition of the high glass forming ability. Microstructural charac- terization reveals that the composites contain micron-sized Cuzr phase with martensite structure, as well as nano-sized zr2Cu crystalline particles and Cu10zr7 plate-like phase em- bedded in an amorphous matrix. Room temperature com- pression tests showed that the composites exhibited signifi- cant strain hardening and obvious plastic strain of 7.7% for 3 mm and 6.4% for 4 mm diameter samples, respectively.

关键词：金属玻璃剪切带塑性变形微观结构力学性质

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Magnetic Hardening of Rapidly Quenched Co-M-zr(M=B,Fe)Alloys

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Chinese Physics Letters 1993年第3期10卷 175-178页

作者： SHEN Baogen YANG Linyuan CAO Lei guo Huiqun State Key Laboratory of Magnetism Institute of PhysicsAcademia SinicaBeijing 100080

Effects of the quenching rate and annealing temperature on hard magnetic properties of rapidly quenched Co_(84-x)B_(x)zr_(16)and Co_(82-x)Fe_(x)zr_(18)alloys were *** B-or Fe-content dependence of room temperature coercivity H_(c),remanence B_(r) and maximum energy product(BH)_(max) are *** H_(c) is suggested to originate from the microstructure with the optimal grain size.

关键词： microstructure grain alloys

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Local time and Tanaka formula of G-martingales

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Applied Mathematics(A Journal of Chinese Universities) 2019年第4期34卷 468-479页

作者： LIU guo-min School of Mathematical Sciences Fudan University

The objective of this paper is to study the local time and Tanaka formula of symmetric *** introduce the local time of G-martingales and show that it belongs to the G-expectation space LG^2(ΩT).By a localization argument,we obtain the bicontinuous modification of local ***,we give the Tanaka formula for convex functions of G-martingales.

关键词： G-martingale Local time Tanaka formula

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Preparation and electrical conductivity of(zr,Hf,Pr,Y,La)O high entropy fluorite oxides

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Journal of Materials Science & Technology 2022年第10期105卷 122-130页

作者： Fengnian Zhang Fuhao Cheng Chufei Cheng Meng guo Yufeng Liu Yang Miao Feng Gao Xiaomin Wang College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

A series of compositionally complex fluorite oxides(CCFOs)were prepared by ball milling the mixture of zrO_(2),HfO_(2),Y_(2)O_(3),La_(2)O_(3),and Pr_(6)O_(11)followed by conventional solid-state *** XRD and TG-DSC results demonstrated that single-phase(zr_(0.2)Hf_(0.2)Pr_(0.2)Y_(0.2)La_(0.2))O_(2-)δwas formed at 1400°*** in bulk ceramic were uniformly distributed without evident accumulation according to SEM-EDS *** results revealed that polycrystalline ceramic powder was assignable to cubic Fm-3m fluorite *** electrical conductivity(σ)was measured via EIS technology and activation energy(E_(a))of CCFOs was calculated in Arrhenius *** the temperature range of 300-750°C,CCFOs preserved the same conduction mechanism and(zr_(0.1667)Hf_(0.1667)Pr_(0.1667)Y_(0.25)La_(0.25))O_(2-)δpossessed higherσand lower E_(a) than other high entropy fluorite oxides which is related to the incorporation of Pr element or the connection of cation-V_(o) complex.

关键词： High-entropy ceramic Fluorite structure Electrical conductivity Cation-size difference

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Effects of zr content on electrochemical performance of Ti/Sn-Ru-Co-zrO_(x)electrodes

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International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2181-2188页

作者： Linhui Chang Sheng Chen Xionghui Xie Buming Chen Haihong Qiao Hui Huang Zhongcheng guo Ruidong Xu Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China Research Center of Metallurgical Electrode Materials Engineering Technology Kunming 650106China Kunming Hendera Science and Technology Co. Ltd.Kunming 650106China North Night Vision Technology Research Institute Group Co. Ltd.Optical CompanyKunming 650093China

The low cell voltage during electrolytic Mn from the MnCl_(2) system can effectively reduce the power *** this work,the Ti/Sn−Ru−Co−zr modified anodes were obtained by using thermal decomposition *** physical parameters of coatings were observed by SEM(scanning electron microscope).Based on the electrochemical performance and SEM/XRD(X-ray diffraction)of the coatings,the influence of zr on electrode performance was studied and *** the mole ratio of Sn−Ru−Co−zr is 6:1:0.8:0.3,the cracks on the surface of coatings were the smallest,and the compactness was the best due to the excellent filling effect of zrO_(2)***,the electrode prepared under this condition had the lowest mass transfer resistance and high chloride evolution activity in the 1mol%NH_(4)Cl and 1.5mol%HCl *** service life of 3102 h was achieved according to the empirical formula of accelerated-life-test of the new type anode.

关键词： Ti/Sn−Ru−Co−zr anode electrochemical Mn electrowinning manganese chloride system service life

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Deformation mechanism of fine grained Mg-7Gd-5Y-l.2Nd-0.5zr alloy under high temperature and high strain rates

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Journal of Magnesium and Alloys 2020年第4期8卷 1144-1153页

作者： Wanru Tang Zheng Liu Shimeng Liu Le Zhou Pingli Mao Hui guo Xiaofang Sheng School of Materials Science and Engineering Shenyang University of Technology110870China Key Laboratory of Magnesium Alloys and the Processing technology of Liaoning Province 110870China Wanfeng Auto Holding Group Shaoxing312500China

Fine grained Mg-7Gd-5Y-1.2Nd-0.5zr alloy was investigated by dynamic compression tests using a Split Hopkinson Pressure Bar under the strain rates in the range 1000-2000 s^(-1) and the temperature range 293-573 K along the normal *** microstructure was measured by optical microscopy,electron back-scattering diffraction,transmission electron microscopy and X-ray *** results showed that Mg-7Gd-5Y-1.2Nd-0.5zr alloy had the positive strain rate strengthening effect and thermal softening effect at high *** solid solution of Gd and Y atoms in Mg-7Gd-5Y-1.2Nd-0.5zr alloy reduced the asymmetry of α-Mg crystals and changed the critical shear stress of various deformation *** main deformation mechanisms were prismatic slip and pyramidal(a)slip,{102}tension twinning,and dynamic recrystallization caused by local deformation such as particle-stimulated nucleation.c 2020 Published by Elsevier *** behalf of Chongqing University.

关键词： Mg-7Gd-5Y-1.2Nd-0.5zr magnesium alloy High strain rate deformation Local deformation mechanism

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A Selective Attention Guided Initiative Semantic Cognition Algorithm for Service Robot

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International Journal of Automation and computing 2018年第5期15卷 559-569页

作者： Huan-Zhao Chen guo-Hui Tian guo-Liang Liu School of Control Science and Engineering University of Shandong

With the development of artificial intelligence and robotics, the study on service robot has made a significant progress in recent years. Service robot is required to perceive users and environment in unstructured domestic environment. Based on the perception,service robot should be capable of understanding the situation and discover service task. So robot can assist humans for home service or health care more accurately and with initiative. Human can focus on the salient things from the mass observation information. Humans are capable of utilizing semantic knowledge to make some plans based on their understanding of the environment. Through intelligent space platform, we are trying to apply this process to service robot. A selective attention guided initiatively semantic cognition algorithm in intelligent space is proposed in this paper. It is specifically designed to provide robots with the cognition needed for performing service tasks. At first, an attention selection model is built based on saliency computing and key area. The area which is highly relevant to service task could be located and referred as focus of attention（FOA）. Second, a recognition algorithm for FOA is proposed based on a neural network. Some common objects and user behavior are recognized in this step. At last, a unified semantic knowledge base and corresponding reasoning engine is proposed using recognition result. Related experiments in a real life scenario demonstrated that our approach is able to mimic the recognition process in humans, make robots understand the environment and discover service task based on its own cognition. In this way, service robots can act smarter and achieve better service efficiency in their daily work.

关键词： Service robot cognition computing selective attention semantic knowledge base artificial neural network.

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Microstructure and mechanical properties of TC4 joints brazed with Ti-zr-Cu-Sn amorphous filler alloy

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Rare Metals 2021年第7期40卷 1881-1889页

作者： Hui-Hui Zhang Zhen-Duo Cui Sheng-Li Zhu Shi-Wei guo Xian-Jin Yang Akihisa Inoue School of Materials Science and Engineering Tianjin UniversityTianjin 30007China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin 300072China Tianjin Key Laboratory of Composite and Functional Materials Tianjin 300072China Department of Physics King Abdulaziz UniversityJeddah 22254Saudi Arabia

The Ti_(51.44)zr_(16.26)Cu_(30)Sn_(2.3)(at%)amorphous filler alloy in a ribbon form was prepared by melt *** Ti-6 Al-4 V alloy was brazed in vacuum furnace by using the Ti_(51.44)zr_(16.26)Cu_(30)Sn_(2.3)amorphous filler *** effects of brazing temperature and holding time on the interfacial microstructure and mechanical properties of the Ti-6 Al-4 V brazed joints were *** brazed joints are composed ofα-Ti,β-Ti,and(Ti,zr)_(2)Cu *** shear strength of the joints increases with brazing temperature increasing from 1153 to 1193 K and holding time from 10 to 15 min,while decreases with brazing temperature and time further *** temperature brazing results in the formation of microcracks and voids in the seams,which are harmful for the shear strength of the *** the joint brazed at 1193 K for 15 min,a fineα+βWidmansta¨tten structure beneficial to the mechanical property is formed,and the joint exhibits relatively high joint strength of 180 MPa.

关键词： Amorphous alloy Brazing Titanium alloy Microstructure Mechanical property

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The First-principles Study on the Occupation Behavior and the Ductility Mechanism of zr in Ni-Ni_3Al System with Lattice Misfit

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Journal of Materials Science & Technology 2014年第5期30卷 517-522页

作者： Yuxi Wu Wanglin Zhang Jia guo Jieshan Hou Xiuyan Li Renzhong Huang Xiufang Ma Qianfeng Zhang Institute of Molecular Engineering and Applied Chemistry Anhui University of Technology Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences College of Physics Science and Technology Shenyang Normal University

The influence of lattice misfit on the occupation behavior and the ductility effect of zr in Ni-Ni3Al alloys were explored. It is found in energy analysis that the preferable site of zr between Ni sublattice and Al sublattice will change under different lattice misfit, however, the zr prefers to segregate Ni phase rather than Ni3Al phase in all lattice misfit range, which makes it impossible for zr to go into Ni3Al phase to occupy Al sublattice in Ni-Ni3Al system. Bond order （BO） analysis shows that the localized ductility effect of zr differs in different region, and the comparison between zr-free and zr-doped BO analysis successfully explain the mechanism of the embrittlement of Ni-Ni3Al alloys and the ductility effect of zr.

关键词： Zirconium Lattice misfit Occupation behavior Ductility Embrittlement

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