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Effects of Grain Morphology and Size on Processing and Electrical Properties of Ag-28Cu-0.75Ni Alloy Ultra-fine Wire
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1.Kunming University of Science and Technology;2.State Key Laboratory of Advance Technologies for Comprehensive Utilization of Platinum Metals,Kunming

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Open subject of State Key Laboratory of Advance Technologies for Comprehensive Utilization of Platinum Metals(SKL-SPM-2018014);National Natural Science(51861020)

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    Abstract:

    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.

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[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.]
DOI:10.12442/j. issn.1002-185X.20190941

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History
  • Received:November 10,2019
  • Revised:February 17,2020
  • Adopted:February 20,2020
  • Online: November 04,2020
  • Published: