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| EFFECTS OF Ag CONTENT ON MICROSTRUCTURE AND PROPERTIES OF THE FILAMENT STRENGTHENED Cu-Ag ALLOYS |
| LIU Jiabin; ZHANG Lei; MENG Liang |
| 浙江大学金属材料研究所 |
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Cite this article:
LIU Jiabin; ZHANG Lei; MENG Liang. EFFECTS OF Ag CONTENT ON MICROSTRUCTURE AND PROPERTIES OF THE FILAMENT STRENGTHENED Cu-Ag ALLOYS. Acta Metall Sin, 2006, 42(9): 937-941 .
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Abstract Cu-Ag filamentary microcomposites with various Ag concentrations were prepared by cold drawing combined with intermediate heat treatments. The influences of Ag content on the microstructure evolution, tensile strength and electrical conductivity were investigated. The as-cast microcomposites containing 6%-24% Ag (mass fraction) consisted of -Cu dendrites, eutectic colonies and secondary particles. The eutectic colonies and secondary particles evolved into eutectic filamentary bundles and uniformed fine fibres during cold drawing. With the increase of Ag content, the tensile strength and strain hardening rate increase but the electrical conductivity decreases because the amount of the eutectic filamentary
bundles and secondary precipitated fibres increases in the microcomposites. In special, the electrical conductivity loses more significantly if the Ag concentration is high enough to produce the eutectic filamentary bundles with a continuous net-like distribution. The eutectic filamentary bundles in the microcomposites with high Ag concentrations can produce greater benefit to the material strengthening than the secondary precipitated fibres in those with low Ag concentrations. However, the eutectic filamentary bundles can reduce the electrical conductivity more evidently than the secondary precipitated fibres.
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Received: 09 November 2005
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