牛海东,武海军,陈家林,左孝青,周芸.晶粒形态、尺寸对Ag-28Cu-0.75Ni合金超细丝加工及电学性能的影响[J].稀有金属材料与工程,2020,49(10):3590~3596.[Niu Haidong,Wu Haijun,Chen Jialin,Zuo Xiaoqing,Zhou Yun.Effects of Grain Morphology and Size on Processing and Electrical Properties of Ag-28Cu-0.75Ni Alloy Ultra-fine Wire[J].Rare Metal Materials and Engineering,2020,49(10):3590~3596.]
晶粒形态、尺寸对Ag-28Cu-0.75Ni合金超细丝加工及电学性能的影响
投稿时间:2019-11-10  修订日期:2020-02-17
中文关键词:  Ag-28Cu-0.75Ni合金  晶粒形态  晶粒尺寸  超细丝加工  电阻率
基金项目:稀贵金属综合利用新技术国家重点实验室开放课题(SKL-SPM-2018014);国家自然科学(51861020)
中文摘要:
      为诠释柱状晶贵金属兼具优良超细丝加工性能及高电阻率的原因,采用水平连铸、水冷铜模铸造及石墨模铸造,分别获得了具有20 μm×60 μm的柱状晶、10 μm的等轴晶、以及5 μm的表面细晶+长径比约为3的柱状晶+30 μm的芯部等轴晶三晶区的三种Ag-28Cu-0.75Ni合金棒材,研究了晶粒形态、尺寸对Ag-28Cu-0.75Ni合金棒材超细丝加工性能及电阻率的影响。结果表明:与等轴晶和三晶区Ag-28Cu-0.75Ni合金棒材相比,柱状晶棒材由于其较低的位错密度(1.78×1015 m-2)及显微硬度变化率(33.3%)、铸态断口无解理台阶,表现了出最低的加工硬化率,且铸态轴向抗拉强度高达384.6 MPa,可实现100 m以上、直径0.05 mm超细丝高效不断丝加工;加工态及退火态的柱状晶Ag-28Cu-0.75Ni合金超细丝均表现出了较高的电阻率,经两次连续退火后电阻率高达3.68 μΩ.cm,与其较低的位错密度及加工硬化率有关。
Effects of Grain Morphology and Size on Processing and Electrical Properties of Ag-28Cu-0.75Ni Alloy Ultra-fine Wire
英文关键词:Ag-28Cu-0.75Ni alloy  grain morphology  grain size  ultra-fine wire processing  resistivity
英文摘要:
      In order to explain the reason why the columnar crystal precious metal has excellent ultra-fine wire processing property and high resistance, three kinds of Ag-28Cu-0.75Ni alloy bars, columnar crystal of 20 μm×60 μm, equiaxed crystal of 10 μm, and tri-crystal zone with surface fine crystal of 5 μm + columnar crystal with length diameter ratio of around 3 + core equiaxed crystal of 30 μm, were obtained by horizontal continuous casting, water-cooled copper die casting, and graphite die casting, respectively. The effects of grain morphology and size on the ultra-fine wire processability and resistivity of Ag-28Cu-0.75Ni alloy bars were studied. The results show that, compared with the equiaxed crystal bar and the tri-crystal zone bar, the columnar crystal bar has the lower dislocation density (1.78×1015 m-2), the lowest ratio of micro-hardness change (33.3%), and no cleavage step after the tensile test, thus, it presents the lowest work hardening rate. Besides, the axial tensile strength of as-cast columnar crystal bar is up to 384.6 MPa. Therefore, the ultra-fine wire with the diameter of 0.05 mm and the length of 100 meters or more can be obtained by the high-efficiency continuous wire drawing of the columnar crystal bar. The resistivity of processed and annealed Ag-28Cu-0.75Ni alloy ultra-fine wires that drawn from the columnar crystal bar are higher, after two times continuous annealing, the resistivity of columnar crystal Ag-28Cu-0.75Ni alloy ultra-fine wire is up to 3.68 μΩ.cm, which is related to the lower dislocation density and work hardening rate.
作者单位E-mail
牛海东 昆明理工大学 1246461409@qq.com 
武海军 稀贵金属综合利用新技术国家重点实验室  
陈家林 稀贵金属综合利用新技术国家重点实验室  
左孝青 昆明理工大学 zxqdzhhm@163.com 
周芸 昆明理工大学  
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