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Effect of cerium on microstructure,texture and properties of ultrahigh-purity copper

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The effects of Ce addition(310 ppm and 1500 ppm)on the microstructure,texture and properties of ultrahigh-purity copper(99.99999％)were systematically studied using scanning electron microscopy(SEM),transmission electron microscopy(TEM)and electron backscattered diffraction(EBSD)analyses,combined with the microhardness and conductivity tests.Regarding the microstructure of the as-cast and as-extruded samples,the addition of Ce refines the grain size of the ultrahigh-purity copper and the refinement effect of 310Ce alloy is greater than that of 1500Ce alloy.This is due to the stronger component supercooling and the accelerated recrystallization caused by lower Ce content.In addition,Ce can react with Cu to form the Cu-Ce eutectic phases,which are deformable during the hot deformation.Furthermore,the added Ce can weaken the texture,showing a variation of brass recrystallization(BR),rotated cube,copper and S texture components,which depends on the recrystallization,the particle stimulated nucleation(PSN)as well as the stacking fault energy(SFE).Most remarkably,the introduction of Ce enhances the hardness of the ultrahigh-purity copper without obviously reducing its conductivity.The major {111} orientations and the stress distributions are responsible for such a superior conductivity of the Ce-containing alloys.

Ce additionGrain refinementTextureConductivityUltrahigh-purity copperRare earths

Yunxiao Hua、Haitao Liu、Kexing Song、Jiangwei Wang、Yin'gang Guo、Jing Tian、Huiwen Guo

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Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology,School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang,471023,China

Henan Academy of Sciences,Zhengzhou,450000,China

Center of Electron Microscopy and State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou,310027,China

Henan Zhongyuan Gold Smelter Co.,Ltd.,Sanmenxia,472100,China

Chinalco Luoyang Copper Processing Co.,Ltd.,Luoyang,471039,China

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Henan Province Science and Technology Tackling Key Problems ProjectHenan Province Young Talent Lifting Engineering ProjectCentral Plain Scholar Workstation ProjectNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2221022300012021HYTP018224400510025520711335190409052071284

2024

10.1016/j.jre.2022.10.013

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(1)
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