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Microstructure and properties of Cu-Ni-Si-Zr alloy after thermomechanical treatments

Rare Metals 2013年第2期32卷 144-149页

作者： Xiang-Peng Xiao Bai-Qing Xiong Qiang-Song Wang Guo-Liang Xie Li-Jun Peng Guo-Xing Huang State Key Laboratory for Fabrication and Processing of Non-ferrous Metals General Research Institute for Nonferrous Metals aluminum corporation of china limited luoyang copper co. Ltd.

The effect of thermomechanical treatments on the microstructures and properties of Cu-2.1Ni-0.5Si- 0.2Zr alloy was investigated. The hot-rolled plates were solution treated at 920 ℃ for 1.5 h, quenched into water, co.d rolled by 70 % reduction in thickness, and then aged at 400, 450 and 500 ℃for various times. The variation in tensile strength and electrical co.ductivity of the alloy was measured as a function of the aging time. The results show the peak strength value of 665 MPa for the alloy aged at 450 ℃ for 2 h. However, the electrical co.ductivity is observed to reach a maximum of 47 % IACS aged at 450℃for 8 h. OM, SEM, and TEM were used for microstructural inspection of the alloy. Precipitation occurs preferentially at deformation bands in the co.d-rolled alloy. Properties behavior is discussed in the light of microstructural features.

关键词： Cu-Ni-Si-Zr alloy Precipitation Electricalco.ductivity Tensile strength Microstructural features

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co.creation of a copper-centered industry–university research innovation eco.ystem

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cMat 2024年第1期1卷 108-109页

作者： Gaoqing Zheng Jiangxi copper corporation limited YingtanChina

Scientific journals are important carriers for inheriting knowledge,co.lecting academic achievements,and leading industrial innovation,which directly reflect a co.ntry's scientific co.petitiveness and cultural soft *** response to the strategy of building prosperity through science and technology and to foster world-class scientific journals,the china Association for Science and Technology(CAST)and six other departments/organizations launched the“Excellence Action Plan for china's STM Journals”program in *** a high-standard new journal included in the plan,cMat is officially launched today.

关键词： journal centered copper

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Electronic structure and spin state regulation of vanadium nitride via a sulfur doping strategy toward flexible zinc-air batteries

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Journal of Energy Chemistry 2024年第2期89卷 239-249,I0007页

作者： Daijie Deng Honghui Zhang Jianchun Wu Xing Tang Min Ling Sihua Dong Li Xu Henan Li Huaming Li Institute for Energy Research Institute of Quantum and Sustainable TechnologySchool of Chemistry and Chemical EngineeringSchool of Materials Science and EngineeringJiangsu Province and Education Ministry Co-Sponsored Synergistic Innovation Center of Modern Agricultural EquipmentJiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province Nanjing 210023JiangsuChina Zhenjiang Kangyuan Electrical Appliance co. Ltd.Zhenjiang 212013JiangsuChina co.lege of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310027ZhejiangChina YTO Group corporation Dongfanghong(Henan)Agricultural Service Technology co. Ltd.Luoyang 471033HenanChina

Owing to the distinctive structural characteristics,vanadium nitride(VN)is highly regarded as a catalyst for oxygen reduction reaction(ORR)in zinc-air batteries(ZABs).However,VN exhibits limited intrinsic ORR activity due to the weak adsorption ability to O-co.taining ***,the S-doped VN anchored on N,S-doped multi-dimensional carbon(S-VN/co.NS-MC)was co.structed using the solvothermal and in-situ doping *** sulfur atoms into VN species alters the electron spin state of vanadium in the S-VN/co.NS-MC for regulating the adsorption energy of vanadium sites to oxygen *** introduced sulfur atoms polarize the V 3d_(z)^(2) electrons,shifting spin-down electrons closer to the Fermi level in the S-VN/co.***,the introduction of sulfur atoms into VN species enhances the adsorption energy of vanadium sites for oxygen ****OOH dissociation transitions from being unspontaneous on the VN surface to a spontaneous state on the S-doped VN ***,the ORR barrier on the S-VN/co.NS-MC surface is *** S-VN/co.NS-MC demonstrates a higher half-wave potential and limiting current density co.pared to the VN/co.*** S-VN/co.NS-MC-based liquid ZABs display a power density of 195.7 m W cm^(-2),a specific capacity of 815.7 m A h g^(-1),and a cycling stability exceeding 250 *** S-VN/co.NS-MC-based flexible ZABs are successfully employed to charge both a smart watch and a mobile *** approach holds promise for advancing the co.mercial utilization of VN-based catalysts in ZABs.

关键词： S-doped VN Electronic structures Spin state regulation Oxygen reduction reaction Zinc-air batteries

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A Loss-model-based Efficiency Optimization co.trol Method for Induction Traction System of High-speed Train under Emergency Self-propelled Mode

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CES Transactions on Electrical Machines and Systems 2024年第2期8卷 227-239页

作者： Yutong Zhu Yaohua Li Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190China University of Chinese Academy of Sciences Beijing 100190China china Academy of Railway Sciences corporation limited(Beijing Zongheng Electromechanical Technology co.Ltd Beijing 100081 China IEEE

Increasing attention has been paid to the efficiency improvement of the induction traction system of high-speed trains due to the high demand for energy saving. In emergency self-propelled mode, however, the dc-link voltage and the traction power of the motor are significantly reduced, resulting in decreased traction efficiency due to the low load and low speed operations. Aiming to tackle this problem, a novel efficiency improved co.trol method is introduced to the emergency mode of high-speed train traction system in this paper. In the proposed method, a total loss model of induction motor co.sidering the behaviors of both iron and copper loss is established. An improved iterative algorithm with decreased co.putational burden is then introduced, resulting in a fast solving of the optimal flux reference for loss minimization at each co.trol period. In addition, co.sidering the parameter variation problem due to the low load and low speed operations, a parameter estimation method is integrated to improve the co.troller's robustness. The effectiveness of the proposed method on efficiency improvement at low voltage and low load co.ditions is demonstrated by simulated and experimental results.

关键词： Efficiency optimization Induction motor Loss model co.trol Motor drives Traction system

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