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

Journal of Rare Earths 2024年第1期42卷 220-227,I0008页

作者： Yunxiao Hua Haitao Liu Kexing Song Jiangwei Wang Yin'gang Guo Jing Tian Huiwen Guo Provincial and Ministerial Co-construction of Collaborative Innovation center for Non-ferrous Metal New Materials and Advanced Processing Technology School of Materials Science and EngineeringHenan University of Science and TechnologyLuoyang471023China Henan Academy of Sciences Zhengzhou450000China center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310027China Henan Zhongyuan Gold Smelter Co. Ltd.Sanmenxia472100China Chinalco Luoyang Copper Processing Co. Ltd.Luoyang471039China

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 *** 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 *** is due to the stronger compone nt supercooling and the accele rated recrystallization caused by lower ce co *** addition,ce can react with Cu to form the Cu-ce eutectic phases,which are deformable during the hot ***,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 *** major{111}orientations and the stress distributions are responsible for such a superior conductivity of the ce-containing alloys.

关键词： ce addition Grain refinement Texture Conductivity Ultrahigh-purity copper Rare earths

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Microstructure,tensile and creep properties of as-cast Mg-3.8Zn-2.2C_(a-x)ce(x=0,0.5,1 and 2 wt.%) magnesium alloys

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Journal of Rare Earths 2012年第2期30卷 181-188页

作者：杨明波郭廷长秦财源潘复生 Materials Science and Engineering College Chongqing University of Technology Key Laboratory of Automobile Components Manufac-turing and Testing Technology of the Education Ministry Chongqing University of Technology National Engineering Research center for Magnesium Alloys Chongqing University

The microstructure and mechanical properties of as-cast Mg-3.8Zn-2.2Ca alloy with different ce contents were investigated by both optical and electron microscopy, X-ray diffraction, differential scanning calorimetry analysis, tensile and creep tests. The results indi-cated that adding 0.41 wt.%-1.83 wt.% ce could refine the grains of the alloy, and the grain size gradually decreased as the ce content in-creased. Furthermore, addition of either 0.41 wt.% or 0.89 wt.% ce caused the morphology of the Ca2Mg6Zn3 phase to change partially from semi-continuous block to discrete fine particles. However, after adding 1.83 wt.% ce, portions of the Ca2Mg6Zn3 and Mg12ce phases were mixed and this Ca2Mg6Zn3＋Mg12ce eutectic changed to a different coarse semi-continuous morphology. In addition, addition of 0.41 wt.%-1.83 wt.% ce improved the tensile and creep properties of the alloy. Amongst these ce-containing alloys, the alloy with 0.89 wt.% ce exhibited the best ultimate tensile strength and elongation while the alloy with 1.83 wt.% ce had the best yield strength and creep properties.

关键词： magnesium alloys Mg-Zn-Ca alloy ce addition rare earths

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Influence of cerium addition on Microstructure and Properties of Cu-Ag Alloy in Situ Filamentary Composites

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Journal of Rare Earths 2005年第S1期23卷 392-398页

作者：宁远涛张晓辉秦国义 Kunming Institute of Precious Metals Kunming 650221 China

The in situ filamentary composites based on the Cu-10Ag and Cu-10Ag-ce alloys were prepared. The microstructure and properties of the composites were studied. The effects of ce addition on the microstructure as cast, including refining Cu grains and the Ag filaments, increasing the proportion of (Cu+Ag) eutectic and decreasing the proportion of the Ag precipitate, were researched. The average size of the Ag filaments in the composites could be approached by a formula: d=C·exp(-0.228η), here C is a coefficient related to the size of the original grains and 1500 nm for Cu-10Ag and 800 nm for Cu-10Ag-ce. A two-stage strain strengthening effect was found for the deformed composites, that is the dislocation strengthening at low strain stage and the ultra-fine Ag filaments or interface strengthening at the high strain stage. The intermediate heat treatment at lower temperature further refined the Ag filaments and therefore improved the properties. The high strengthening rate of ce addition on Cu-10Ag alloy attributed the refining effect to Cu grains and Ag filaments. The typical properties of the heavy deformed composites with 1 IHT reached to UTS=1500 MPa with conductivity 62% IACS for the Cu-10Ag alloy and UTS=1550 MPa with conductivity 65% IACS for the Cu-10Ag-ce alloy, respectively.

关键词： composite Cu-Ag alloy ce addition microstructure strength conductivity

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Effect of ce on the thermal stability of the Ω phase in an Al-Cu-Mg-Ag alloy

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Rare Metals 2009年第2期28卷 156-159页

作者： Song, Min Xiao, Daihong Zhang, Fuqin State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China

This paper studies the effect of ce on the thermal stability of the Ω phase in an Al-Cu-Mg-Ag alloy by TEM and tensile testing. It has been shown that ce substantially increases the nucleation density of the Ω phase by acting as the heterogeneous nucleation center. Most impor-tantly,ce improves the thermal stability of the Ω phase by decreasing the diffusion velocity of Cu atoms and increasing the energy barrier of the thickening ledge nucleation,thus improving the strength of the Al-Cu-Mg-Ag alloy at both ...

关键词： aluminium alloys Ω phase thermal stability ce addition

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EFFECTS OF IMPURITIES AND RARE EARTH addition ON THE TOUGHENING LEVELS OF Al-Li BASED ALLOYS 2090 AND 1420

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Acta Metallurgica Sinica(English Letters) 1998年第3期11卷 163-168页

作者： L.Meng T.P.Tu Y.Z.Yang M.S.Liu Zhejiang Univ Hangzhou China

The effects of the impurities Fe, Si, Na, K and a rare earth addition, ce, on the intrinsic and extrinsic toughening levels have been investigated for the Al-Li based alloys 2090 and 1420. 29K reduction in the toughening level for the alloy 2090 with impurities 0.42% Fe+Si or 0.0132% Na+K i4 identified to be caused by the *** improvement on the fracture toughness can be made by adding 0.05%-0.25% ce to the alloy 2090. The reason behind this is that ce microalloying can not only enhance both the intrinsic toughening level and the extrinsic toughening level but also suppress the embrittling behavior of the impurities. However, 0.06%-0.15% ce microalloying fails to bring about any beneficial effect to the toughening level for the alloy 1420.

关键词： Al-Li based alloy impurity ce addition toughening

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