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Recrystallization and fracture characteristics of thin copper wire

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Abstract

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.

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Acknowledgement

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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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 701, Taiwan, ROC

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

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  1. Fei-Yi Hung
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  2. Truan-Sheng Lui
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  3. Li-Hui Chen
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  4. Yuan-Tin Wang
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Correspondence to Truan-Sheng Lui.

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Hung, FY., Lui, TS., Chen, LH. et al. Recrystallization and fracture characteristics of thin copper wire. J Mater Sci 42, 5476–5482 (2007). https://doi.org/10.1007/s10853-006-0883-0

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  • DOI: https://doi.org/10.1007/s10853-006-0883-0

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