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Isothermal section of the ternary Sn-Cu-Ni system and interfacial reactions in the Sn-Cu/Ni couples at 800 °C

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Abstract

The isothermal section of the Sn-Cu-Ni system at 800 °C has been experimentally determined. There is no ternary compound. A solid solution with a very wide compositional range, the γ phase is formed between the Ni3Sn(H) phase and Cu4Sn(H) phase; however, both of these two binary phases are not stable at 800 °C. The binary Ni3Sn2 phase also has extensive ternary solubility. The homogeneity ranges of both the γ and Ni3Sn2 phases are very large in parallel to the Cu-Ni side, but relatively narrow along the Sn direction. This phenomenon indicates that Cu and Ni are exchangeable in both phases. Three kinds of reaction couples, Sn-55 at. pct Cu/Ni, Sn-65 at. pct Cu/Ni, and Sn-75 at. pct Cu/Ni, were prepared and reacted at 800 °C for 5 to 20 minutes. The reaction paths are liquid/Ni3Sn2/γ/Ni3Sn(L)/Ni for the Sn-55 at. pct Cu/Ni and Sn-65 at. pct Cu/Ni couples, and the reaction path is liquid/γ/Ni3Sn(L)/Ni for the Sn-75 at. pct Ni couples.

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Wang, CH., Chen, SW. Isothermal section of the ternary Sn-Cu-Ni system and interfacial reactions in the Sn-Cu/Ni couples at 800 °C. Metall Mater Trans A 34, 2281–2287 (2003). https://doi.org/10.1007/s11661-003-0292-9

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  • DOI: https://doi.org/10.1007/s11661-003-0292-9

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