李晓娜

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:女

毕业院校:大连理工大学

学位:博士

所在单位:材料科学与工程学院

学科:材料物理与化学

办公地点:三束实验室2号楼302室

联系方式:0411-84708380-8302

电子邮箱:lixiaona@dlut.edu.cn

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Comparative studies on microstructures and properties of Cu-Ni-M alloys controlled by strong interaction between elements

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论文类型:期刊论文

发表时间:2019-10-15

发表刊物:JOURNAL OF ALLOYS AND COMPOUNDS

收录刊物:SCIE

卷号:805

页面范围:404-414

ISSN号:0925-8388

关键字:Copper alloy; Microstructure; Resistivity; Heat resistance

摘要:The heat resistance of copper alloys is desirable to improve while it services at high temperature as electrically and thermally conductive components. In present paper, the strengthening pattern of nickel-based superalloys is expected to be applied in copper alloys. Here the Cu50Ni37.5M12.5 (M = Al, Cr, Mo) alloys were prepared by vacuum arc melting and heat-treated in the corresponding conditions to obtain three different kinds of typical microstructure. The room temperature (RT) properties (hardness and resistivity) and high temperature properties (melting point, softening temperature and variable temperature resistivity) of the three alloys are contrasted and analyzed in detail. The Cu50Ni37.5Al12.5 alloy strengthened through the gamma' phase coherent precipitation shows the best conductivity and highest hardness (5.47 % IACS (International Annealed Copper Standard) and 310.1 HV). The splitting of the gamma' phase is contributing to hardening at high aging temperature. The resistivity-temperature behavior of the three alloys shows that the resistivity with rising temperature consists of the ideal lattice resistivity and the resistivity increment due to the defects. The Cu50Ni37.5Al12.5 alloy has the smallest room temperature resistivity and its resistivity maintains the lowest during the whole heating process (RT-1077K). Therefore, the coherent precipitated gamma' phase is expected to improve the heat resistance of the copper alloys while maintaining its electrical conductivity. (C) 2019 Elsevier B.V. All rights reserved.