Journal of Materials Science

, Volume 42, Issue 14, pp 5476–5482 | Cite as

Recrystallization and fracture characteristics of thin copper wire

  • Fei-Yi Hung
  • Truan-Sheng Lui
  • Li-Hui Chen
  • Yuan-Tin Wang


In this study, the annealed effect (at 150 °C ∼ 250 °C for 1 h) on the tensile mechanical properties of thin copper wires with φ = 25 μm (1 mil) was investigated. The microstructural characteristics and the mechanical properties before and after an electric flame-off (EFO) were also studied. Results indicate that with annealing temperatures of more than 200 °C, the wires possessed a fully annealed structure, the tensile strength and the hardness decreased, and the elongation was raised significantly. Through recrystallization, equiaxed grains and a few annealed twins formed in the matrix structure. The microstructures of the free air ball (FAB) of the various wires after EFO contained column-like grains. The column-like grains grew from the heat-affected zone (HAZ) to the Cu ball, and the preferred orientation was <100>. According to Weibull’s reliability analysis, the failure rates of all the specimens were the modus of wear-failure. The tensile strength and the reliability of both the 200 °C and 250 °C annealed wires in the HAZs showed the highest values of all.


Ultimate Tensile Strength Heat Affect Zone Copper Wire Recrystallization Temperature Annealed Twin 
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The authors are grateful to the Chinese National Science Council for its financial support (Contract: NSC 94-2216-E-006-008).


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Fei-Yi Hung
    • 1
  • Truan-Sheng Lui
    • 1
  • Li-Hui Chen
    • 1
  • Yuan-Tin Wang
    • 1
  1. 1.Department of Materials Science and EngineeringNational Cheng Kung UniversityTainanTaiwan, ROC

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