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Enhanced strength of a high-conductivity Cu-Cr alloy by Sc addition

Rare Metals 2024年第11期43卷 6054-6067页

作者： Tao Huang Chao-Min Zhang Ying-Xuan Ma Shu-Guo Jia Ke-Xing Song Yan-Jun Zhou Xiu-Hua Guo Zhen-Peng Xiao Hui-Wen Guo School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Henan Key Laboratory of Non-Ferrous Materials Science and Processing Technology Luoyang 471023China Henan Academy of Sciences Zhengzhou 450046China Henan Key Laboratory of Advanced Conductor Materials Zhengzhou 450046China Chinaclo Luoyang Copper Processing Co.Ltd. Luoyang 471023China

A new Cu-Cr-Sc alloy was designed,prepared and subjected to deformation heat *** electron microscopy(TEM),electron backscatter diffraction(EBSD)and X-ray diffraction(XRD)were employed to investigate the effects of Sc on the microstructural changes in the Cu-Cr alloy in different states,examine the changes in the precipitates during aging,reveal the intrinsic correlation between the structure and property in the peak aging state,and evaluate the Sc distribution in the Cu-Cr *** addition of Sc significantly increased the yield strength of the Cu-Cr alloy by~24.6%after aging at 480℃for 1 h,while it had a high electrical conductivity of81.5%international annealed copper standard(IACS).This enhancement was attributed to the effective inhibition of Cr phase coarsening and recrystallization through the addition of Sc,which strengthened the ***,in the Cu-Cr-Sc alloy,most of the Sc atoms precipitated as the Cu_(4)Sc phase,with a small amount of Sc segregating at the grain boundaries to pin *** grain boundary pinning helped to inhibit grain growth and further improve the *** main strengthening mechanisms identified in Cu-Cr-Sc alloys were dislocation strengthening and precipitation strengthening.

关键词： Cu-Cr-Sc alloy high strength and high conductivity Precipitation strengthening Cr precipitates

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Effect of Plastic Deformation on Microstructure and Properties of Cu-(1 wt%-6 wt%) Ag Alloy

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Journal of Wuhan University of Technology(Materials Science) 2024年第3期39卷 747-753页

作者：茹亚东 ZHANG Zhongyuan 高召顺 ZHANG Ling ZUO Tingting XUE Jiangli TANG Zhixiang DA Bo LIU Yongsheng XIAO Liye Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China Department of Physics Shanghai University of Electric PowerShanghai 201306China University of Chinese Academy of Sciences Beijing 100190China International Joint Labora-tory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Research and Services Division of Materials Data and Integrated System National Institute for Materials ScienceTsukuba 305-0047Japan

In the present study,the Cu-(1 wt%-6 wt%)Ag alloys were prepared by melting,forging and wire *** effects of plastic deformation on microstructure evolution and properties of the alloys were *** results show that non-equilibrium eutectic colonies exist in the Cu-(3 wt%-6 wt%)Ag alloy and no eutectic colonies in the 1 wt%-2 wt%Ag containing *** eutectic colonies are aligned along the drawing direction and refined with the increase of draw *** to the refinement of eutectic colonies,the Cu-Ag alloy exhibits higher strength with the increase of draw *** Cu-6Ag alloy exhibits excellent comprehensive properties with a strength of 930 MPa and a conductivity of 82%IACS when the draw ratio reaches 5.7.

关键词： Cu-Ag alloy high strength and high conductivity microstructure eutectic structure strengthening mechanism

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Hybrid effect on mechanical properties and high-temperature performance of copper matrix composite reinforced with micro-nano dual-scale particles

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Journal of Materials Science & Technology 2024年第5期172卷 94-103页

作者： Xingde Zhang Yihui Jiang Fei Cao Tian Yang Fan Gao Shuhua Liang School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China Engineering Research Center of Conducting Materials and Composite Technology Ministry of EducationXi’an University of TechnologyXi’an 710048China Shaanxi Province Key Laboratory of Electrical Materials and Infiltration Technology Xi’an University of TechnologyXi’an 710048China

A dual-scale hybrid HfB_(2)/Cu-Hf composite with HfB_(2) microparticles and Cu_(5) Hf nanoprecipitates was designed and *** contribution of the hybrid effect to the mechanical properties and high-temperature performances was studied from macro and micro perspectives,*** hybrid of dual-scale particles can make the strain distribution of the composite at the early deformation stage more uniform and delay the strain concentration caused by the HfB_(2) *** dislocation pinning of HfB_(2) particles and the coherent strengthening of Cu_(5) Hf nanoprecipitates simultaneously play a strengthening role,but the strength of the hybrid composite is not a simple superposition of two strengthening *** addition,both Cu_(5) Hf nanoprecipitates and HfB_(2) microparticles contribute to the high-temperature performance of the composite,the growth and phase transition of nanoprecipitates at high temperature will reduce their contribution to strength,while the stable HfB_(2) particles can inhibit the coarsening of matrix grains and maintain the high-density geometrically necessary dislocations(GNDs)in the matrix,which ensures more excellent high-temperature resistance of the hybrid *** a result,the hy-brid structure can simultaneously possess the advantages of multiple reinforcements and make up for the shortcomings of each ***,a copper matrix composite with high strength,high conductivity,and excellent high-temperature performance is displayed.

关键词： Copper matrix composite HfB 2 particles Hybrid effect high strength and high conductivity high-temperature performance

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