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Phase Equilibria of the Cu-Si-Sn System at 700 and 500 °C

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Abstract

Intermetallic compounds formed in solder joints have a substantial effect on reliability. Because Sn-based alloys are alternatives to lead-containing solders, phase equilibria of the Cu-Si-Sn system were investigated for quenched samples annealed at 700 and 500 °C for 30 days. Nine three-phase equilibria were well established at 700 °C, and a previously unknown ternary τ phase with a possible homogeneity interval in the range Cu76Sn7.8Si16.2-Cu85Sn7.6Si7.4 was found for the first time. The τ phase has a hexagonal structure with a = 8.012 nm and c = 5.04 nm. Six three-phase regions were identified in the isothermal region at 500 °C. In contrast with the isothermal region at 700 °C, the new ternary τ phase was not observed at 500 °C. The solubility of Si in ε-Cu3Sn decreases from 12.8 to 1.4 at.%, and only small variations occur in the homogeneity ranges of η-Cu3Si and γ-Cu5Si.

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Acknowledgments

Financial support from the National Science Foundation of China (grant nos 51171031 and 51271041) and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions is gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Changzhou University, Changzhou, 213164, China

    Yuanyuan Song, Xuping Su, Ya Liu, Haoping Peng, Changjun Wu & Jianhua Wang

  2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, China

    Yuanyuan Song, Xuping Su, Ya Liu, Haoping Peng, Changjun Wu & Jianhua Wang

  3. Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou, 213164, Jiangsu, People’s Republic of China

    Ya Liu

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  1. Yuanyuan Song
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Correspondence to Xuping Su.

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Song, Y., Su, X., Liu, Y. et al. Phase Equilibria of the Cu-Si-Sn System at 700 and 500 °C. J. Phase Equilib. Diffus. 36, 493–502 (2015). https://doi.org/10.1007/s11669-015-0405-3

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  • DOI: https://doi.org/10.1007/s11669-015-0405-3

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