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Precipitation evolution and properties of Cu-15Ni-8Sn alloys via Al microalloying during ageing

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Rare Metals 2024年第10期43卷 5216-5228页

作者： Wei Luo Li-Jun Peng Xu-Jun Mi hao-feng xie Yi-Cheng Cao Shu-Hui Huang State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China

Studies have shown that microalloying Cu-Ni-Sn alloys using Al inhibits discontinuous precipitation reactions;however,the mechanism has not been investigated ***,this study explored the properties and precipitation evolution of Cu-15Ni-8Sn alloys without and with 1 wt%Al(Cu-15Ni-8Sn-1Al)during ageing at 500℃ through X-ray diffraction(XRD),scanning electron microscopy and high-angle annular dark-field scanning transmission electron *** results revealed that in Cu-15Ni-8Sn alloy,DO_(22)ordering first occurred after spinodal decomposition,subsequently transitioning to an L1_(2)ordering phase,during which the discontinuous precipitates gradually nucleated at the grain boundaries and formed *** alloy hardness increased sharply with ordering and then decreased rapidly after reaching its peak value,due to the dominance of the discontinuous precipitation ***,the DO_(22)ordered phase did not appear during the ageing of Cu-15Ni-8Sn-1Al alloy,and a Ni_(3)(Al_(x),Sn_(1-x))intermetallic compound with L1_(2)structure was formed,consuming Ni and Sn atoms,thereby significantly suppressing the discontinuous precipitation reaction and improving the stability during prolonged *** tensile strength(yield strength)of Cu-15Ni-8Sn and Cu-15Ni-8Sn-1Al alloys at peak hardness were 855(755)and 936 MPa(892 MPa),respectively,and their main strengthening mechanisms were solid solution strengthening and precipitation *** addition of 1 wt%Al effectively improved the precipitation strengthening effect of Cu-Ni-Sn alloys but severely decreased the ductility.

关键词： Cu-15Ni-8Sn Al addition Precipitation sequence Strengthening mechanism

Microstructure of phases in a Cu–Zr alloy

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Rare Metals 2015年第10期34卷 706-709页

作者： Li-Jun Peng Xu-Jun Mi Bai-Qing Xiong hao-feng xie Guo-Jie Huang State Key Laboratory of Nonferrous Metals and Processes General Research Institute for Nonferrous Metals

The morphology and crystallography of phases in the Cu-0.12% Zr alloy were investigated by scanning electron microscope(SEM), transmission electron microscope(TEM), and high-resolution transmission electron microscope(HRTEM). The results show that the as-cast microstructure of Cu–Zr alloy is mainly Cu matrix and eutectic structure which consist of Cu and Cu5Zr phases with a fine lamellar structure. The disk-shaped and plateliked Cu5Zr phases with fcc structure are found in the matrix, in which habit plane is parallel to {111}a plane of the *** the copper matrix and Cu5Zr phase,there exists an orientation relationship of [112]a|| [011]Cu5Zr;(111)a||(111)Cu5Zr. The space structure model of Cu5Zr phase can be established.

关键词： Cu–Zr alloy Microstructure Crystal structure Morph

Microstructural evolution and properties of a Cu-Cr-Ag alloy during continuous manufacturing process

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Rare Metals 2021年第8期40卷 2213-2220页

作者： Gao-Lei Xu Li-Jun Peng Guo-Jie Huang hao-feng xie Zhen Yang Xue feng Xiang-Qian Yin Xu-Jun Mi State Key Laboratory of Nonferrous Metals and Processes GRIMAT Engineering Institute Co.Ltd.Beijing101417China Zhejiang Libo Industrial Co. Ltd.Shaoxing312050China

Microstructure evolution and properties of a Cu-Cr-Ag alloy during the continuous manufacturing process were investigated in detail by scanning electron microscopy(SEM)and transmission electron microscopy(TEM)in the *** Cu-Cr-Ag alloy rod with uniform compositions is fabricated by upward continuous casting *** of the Cr phases are observed in the ascast *** the continuous extrusion process,the severe shear deformation and the dynamic aging *** average grain size of as-extruded alloy is much smaller than that of as-cast *** fcc and bcc Cr precipitates appear in the *** interaction mode between dislocations and precipitates can be identified as Orowan bypass mode according to the TEM *** overall difference in the yield strength between as-cast and as-extruded Cu-Cr-Ag alloy is attributed to solid solution strengthening,grain refinement strengthening,precipitation hardening and working hardening.

关键词： Cu-Cr-Ag alloy Upward continuous casting Continuous extrusion Microstructure Physical properties

Improving interface adhesion in TiNi wire/shape memory epoxy composites using carbon nanotubes

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Rare Metals 2021年第4期40卷 934-938页

作者： Xue feng Li-Min Zhao Xu-Jun Mi Guo-Jie Huang hao-feng xie Xiang-Qian Yin Li-Jun Peng Zhen Yang State Key Laboratory of Nonferrous Metals and Process General Research Institute for Nonferrous MetalsBeijing 100088China College of Materials Science and Engineering Liaocheng UniversityLiaocheng 252059China

In order to increase both the interfacial strength and interphase region strength between TiNi wires and shape memory epoxy,a novel interface structure including aminated CNTs was *** morphology shows that after electroplating and etching,continuous and homogeneous concave-convex layers form on the surface of astreated TiNi wires,meanwhile aminated CNTs were planted on the surface which could react with shape memory epoxy at the interface *** interfacial shear strength increases first with the CNT content rising but then a dramatic drop happens,and the maximum is obtained at CNT content of 0.6 g·L^(-1),which is about twice the result of acid etching TiNi wires.

关键词： Interfacial strength Interface structure Carbon nanotube Shape memory material Composite

Antibacterial property,corrosion and discoloration resistance of pure copper containing Zn or Ni

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Rare Metals 2022年第12期41卷 4041-4046页

作者： Yun Jiang Wen-Jing Zhang Xu-Jun Mi Guo-Jie Huang hao-feng xie Xue feng Li-Jun Peng Zhen Yang State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.LtdBeijing 100088China GRIMAT Engineering Institute Co. LtdBeijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China

This study focused on the effects of Zn and Ni addition on the antibacterial properties and corrosion resistance of copper *** antimicrobial properties of copper and copper alloys were evaluated using Escherichia coli... 详细信息

关键词： corrosion resistance alloys

Properties and microstructure of copper–titanium alloys with magnesium additions

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Rare Metals 2024年第5期43卷 2290-2299页

作者： Lue Huang Li-Jun Peng Jiang Li Xu-Jun Mi Gang Zhao Guo-Jie Huang hao-feng xie Yi-Cheng Cao Wen-Jing Zhang Zhen Yang State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute Co. LtdBejing 101407China School of Materials Science and Engineering Northeastern UniversityShenyang110000China General Research Institute for Nonferrous Metals Beijing 100088China China Academy of Space Technology Beijing 100094China China Nonferrous Metals Mining Group(Tianjin)Co.Ltd Tianjin 3001llChina

The volume fractions and morphology of precipitates in precipitation-strengthened Cu-Ti alloys,which precipitate mainly as continuous and discontinuous precipitates,are important for the application of the *** study employed hardness and electrical conductivity tests transmission electron microscopy(TEM),atom probe tomography(APT),and first-principles calculations to demonstrate that the addition of Mg is effective for accelerating nanosized continuousβ'-Cu_(4)Ti precipitation as well as for suppressing the precipitation of coarse lamellar discontinuousβ-Cu_(4)Ti precipitates along the grain boundaries,resulting in Cu-Ti alloys with high yield strength and good electrical *** results showed that the continuous precipitation ofβ'-Cu_(4)Ti was accelerated by the Mg additions,which reduced the supersaturation of the matrix,thereby reducing the chemical driving force for the discontinuous *** the other hand,Mg additions increased the mismatch between the discontinuousβ-Cu_(4)Ti precipitates and matrix decreased the nucleation rate of the discontinuous precipitates,and increased the spacing of the discontinuous precipitation layer,resulting in a lower growth rate of the discontinuous ***,the addition of Mg to Cu-Ti alloys enhances the strength and improves the resistance to over-ageing.

关键词： Cu-Ti-Mg alloy Precipitation hardening Discontinuous precipitation Continuous precipitation Microstructure formation mechanism

Microstructure and physical properties of Cu-2.3Ni-0.5Si alloy with thermo-mechanical treatment

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Rare Metals 2023年第1期42卷 64-69页

作者： Dong-Mei Liu Cong-Shuai Yin Yan-Hong Hua Dong-Lin Zhang Yu-Ao Li Bo-Jie Ma Xiu-Chen Zhao hao-feng xie Li-Jun Peng Guo-Jie Huang Xu-Jun Mi State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.LtdBeijing100088China GRIMAT Engineering Institute Co. Ltd.Beijing101407China General Research Institute for Nonferrous Metals Beijing100088China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China

For Cu-Ni-Si alloys,cold rolling is usually performed after solution treatment to enhance physical properties such as strength and electrical conductivity during the aging *** paper reports the variation in microstructure and physical properties during the aging process of Cu-2.3Ni-0.5Si alloy cold-rolled at room temperature(RT) and cryogenic temperature(CT).When aged at 450℃ for 2 h,RT-rolled samples exhibited a maximum hardness of HV5234 with an electric conductivity of 39.9% *** CTrolled samples,the peak hardness was achieved when the samples were aged at 450% for 1 h.

关键词： alloy Microstructure microstructure

Researches for higher electrical conductivity copper-based materials

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cMat 2024年第1期1卷 92-107页

作者： Wen-Jing Zhang Lue Huang Xu-Jun Mi hao-feng xie Xue feng Jee Hyuk Ahn State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd.BeijingChina GRIMAT Engineering Institute Co. Ltd.BeijingChina General Research Institute for Nonferrous Metals BeijingChina School of Materials Science and Engineering South China University of TechnologyGuangzhouChina Extreme Materials Institute Korea Institute of Materials and ScienceChangwonKorea

Copper and copper-based materials are widely used in power electronics,auto-mobiles,mechanical manufacturing and high-tech manufacturing fields such as aerospace,telecommunications and integrated circuits owing to their compre-hensive advantages in mechanical,electrical conductivity and processing *** the rapid development of technology,many emerging technical fields have introduced more challenging requirements for the electrical conductivity of *** article reviews the research status of high-conductivity copper-based materials and introduces three methods to improve electrical conductivity,including purification,alloying and addition of nanocarbon *** sum-marise the advantages,disadvantages and future development trends of methods for improving copper *** key to producing high-conductivity copper-based materials is development of low-cost,continuous and stable processes.

关键词： copper matrix composite high-strength and high-electrical-conductivity copper alloy higher electrical conductivity pure copper material

Microstructure and mechanical properties of cold-rolled Ti_(50)Ni_(47)Fe_3 shape memory alloy

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Transactions of Nonferrous Metals Society of China 2014年第9期24卷 2890-2895页

作者：李艳锋康小宇尹向前解浩峰米绪军北京有色金属研究总院有色金属材料制备加工国家重点实验室北京100088

Mechanical and shape memory properties of a Ti50Ni47Fe3 alloy annealed at 450-750 °C for 1 h after a cold-rolled reduction of 25% were investigated by phase transformation analysis and microstructure characterization using tensile tests, Vickers hardness tests, electrical resistivity-temperature tests, SEM and TEM. From the results of the tensile, it can be inferred that the fracture stress and yield stress decreased and the fracture elongation increased as the annealing temperature increased for the rolled Ti50Ni47Fe3 alloy. They reached stead values when the temperature was above 650 °C. The change in Vickers hardness corresponded to the change in the fracture stress and yield stress. The electrical resistivity-temperature curves suggest that a two- stage martensitic transformation（B2-R-B19′） occurred during cooling and heating. The transformation temperatures decreased to lower temperatures when the annealing temperature was increased and maintained the same after the annealing temperature reached 650 °C. TEM revealed the distinct processes occurring at elevated temperatures： recovery, polygonization, and recrystallization.

关键词： TiNiFe alloy shape memory alloy cold rolling microstructure mechanical property